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Articoli di riviste sul tema "Listronotus"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 febbraio 2022

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1

Hopper, L. R. E., J. P. R. Le Blanc e G. Boivin. "The detection of Anaphes sp. nov. [Hymenoptera : Mymaridae], an egg parasitoid of the carrot weevil in Nova Scotia". Phytoprotection 77, n. 2 (12 aprile 2005): 79–82. http://dx.doi.org/10.7202/706103ar.

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Abstract (sommario):

The wasps Anaphes victus (Huber) and Anaphes listronoti (Huber) [Hymenoptera : Mymaridae] parasitize 50% of the eggs of carrot weevil, Listronotus oregonensis (Le Conte) [Coleoptera : Curculionidae] in Quebec and in Ontario. Attempts to detect either of these egg parasites from exposed carrot weevil eggs in Nova Scotia were unsuccessful. However, 48 individuals of a new species of parasitic wasp, Anaphes sp. nov. [Hymenoptera : Mymaridae], were detected in carrot (Daucus carota) fields in Nova Scotia, using carrots infested in growth chambers with carrot weevil eggs. Anaphes sp. nov. is distinguishable from the other parasites of the carrot weevil by characteristics of the forewing. Anaphes sp. nov. has a forewing length : width ratio greater than 7 :3 while A. victus and A. listronoti have a forewing length : width ratio of less than 6 : 7.

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2

Gagnon, Annie-Ève, Guy Boivin, Guy Bélair e Benjamin Mimee. "Prevalence of a nematode castrator of the carrot weevil and impact on fecundity and survival". Parasitology 146, n. 6 (20 dicembre 2018): 702–7. http://dx.doi.org/10.1017/s0031182018002056.

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AbstractBradynema listronoti is a parasitic nematode described from infected specimens of the carrot weevil Listronotus oregonensis. Prevalence of infection by B. listronoti under field conditions was followed over a period of 16 years in an untreated carrot field. Susceptibility of different carrot weevil life stages was evaluated as well as the impact of infection on fecundity and mortality. Gene expression in infected and uninfected carrot weevils was also compared to evaluate the impact of the parasite on the host transcriptome. Prevalence of B. listronoti in carrot weevil populations was sustained over the years ranging from 20 to 63%. All the weevil stages exposed to B. listronoti inoculum were susceptible to infection, larvae being more vulnerable (59 ± 8% infected) compared with pupae (4 ± 3% infected) and adults (7 ± 3% infected). The fecundity of infected female weevils was greatly reduced (60-fold) due to an inhibition of the maturation of the reproductive system. Transcriptomic analyses revealed that this parasitic castration may have been triggered by the inhibition of reproductive hormone production. The B. listronoti–L. oregonensis interaction represents a case of parasitic castration with a unique potential for biological control of an important pest of carrots.

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3

Thomas, Kelley, Guy Boivin, Guy Bélair, Robin Giblin-Davis e Yongsan Zeng. "Bradynema listronoti n. sp. (Nematoda: Allantonematidae), a parasite of the carrot weevil Listronotus oregonensis (Coleoptera: Curculionidae) in Quebec, Canada". Nematology 9, n. 5 (2007): 608–22. http://dx.doi.org/10.1163/156854107782024749.

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AbstractBradynema listronoti n. sp. was collected from the haemocoel of adults and the environment of the carrot weevil, Listronotus oregonensis in Quebec, Canada. It is the first species of Bradynema to be reported from weevils and is described and illustrated herein. Bradynema listronoti n. sp. appears to be closest to B. trixagi because of the shared characteristic of a peloderan bursa in males which is not present in the other seven described species in the genus. Bradynema listronoti n. sp. can be differentiated from all members of the genus by the possession of a degenerate, but sometimes visible, stylet remnant, non-degenerate pharynx in males and by the often dorsally-curved C-shaped body (ventral side is convex) of parasitic females. The vestigial stylet in all stages argues for placement of B. listronoti n. sp. within the genus Bradynema, but some characteristics, such as a non-degenerate pharynx in males, suggest placement in a new genus or affinities with other genera in the Allantonematidae, e.g., Allantonema. Molecular analysis of the near full length SSU, D2/D3 expansion segments of the large subunit (LSU) rDNA and partial mitochondrial DNA COI (mtCOI) suggest that this nematode is unique and D2/D3 analysis supports monophyly with B. rigidum, the only other member of the genus to be sequenced.

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4

Tomasetto, F., O. Olaniyan e S. L. Goldson. "Ploidy in Lolium spp. cultivars affects Argentine stem weevil parasitism by Microctonus hyperodae". New Zealand Plant Protection 70 (31 luglio 2017): 326. http://dx.doi.org/10.30843/nzpp.2017.70.98.

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A laboratory study was conducted to: (1) advance earlier work to determine the susceptibility of Listronotus bonariensis (Argentine stem weevil) to its parasitoid biological control agent, Microctonus hyperodae, in the presence of diploid ryegrasses such as Lolium multiflorum or Lolium perenne; and (2) determine whether or not plant orientation (i.e. horizontal vs. vertical) had any effect on parasitism rates. No significant differences in parasitism rates were found in the Listronotus bonariensis populations in the two grasses. However, combining and analysing these data with those from an earlier experiment conducted in the same way showed that parasitism rates were significantly lower in diploid Lolium multiflorum cultivars than in tetraploid Lolium multiflorum. This is the first clear evidence of a ploidy effect on parasitism rates in the presence of Lolium multiflorum. Tetraploid Lolium multiflorum has fewer, more robust and larger tillers than the diploid Lolium spp. so higher parasitism rates may be related to the lack of hiding places for an evasive genetically-driven behaviourally-based resistance by Listronotus bonariensis.

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5

Augustin, Julie, Guy Boivin, Gaétan Bourgeois e Jacques Brodeur. "The effect of temperature on host patch exploitation by an egg parasitoid". PLOS ONE 16, n. 7 (21 luglio 2021): e0254750. http://dx.doi.org/10.1371/journal.pone.0254750.

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The effect of temperature during host patch exploitation by parasitoids remains poorly understood, despite its importance on female reproductive success. Under laboratory conditions, we explored the behaviour of Anaphes listronoti, an egg parasitoid of the carrot weevil, Listronotus oregonensis, when foraging on a host patch at five temperatures. Temperature had a strong effect on the female tendency to exploit the patch: A. listronoti females parasitized more eggs at intermediate temperature (20 to 30°C) compared to those foraging at the extreme of the range (15.9°C and 32.8°C). However, there was no difference in offspring sex-ratio and clutch size between temperature treatments. Mechanisms of host acceptance within a patch differed between temperatures, especially at 32.8°C where females used ovipositor insertion rather than antennal contact to assess whether a host was already parasitized or not, suggesting that host handling and chemical cues detection were probably constrained at high temperature. Females spent less time on the host patch with increasing temperatures, but temperature had no effect on patch-leaving rules. Our results show that foraging A. listronoti females behave better than expected at sub-optimal temperatures, but worse than expected at supra-optimal temperatures. This could impair parasitoid performance under ongoing climate change.

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6

Barker, G. M. "Grass Host Preferences of Listronotus bonariensis (Coleoptera: Curculionidae)". Journal of Economic Entomology 82, n. 6 (1 dicembre 1989): 1807–16. http://dx.doi.org/10.1093/jee/82.6.1807.

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7

Goldson, S. L., J. R. Proffitt e D. B. Baird. "Listronotus bonariensis(Coleoptera: Curculionidae) flight in Canterbury, New Zealand". Bulletin of Entomological Research 89, n. 5 (maggio 1999): 423–31. http://dx.doi.org/10.1017/s0007485399000553.

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AbstractFlight byListronotus bonariensis(Kuschel) in Canterbury, New Zealand varied greatly both within and between seasons; no winter flight was detected between mid-May and mid-August. Predisposing conditions for flight were found to be >19degC, rh <81% and windspeed <10.8 km h–1. Three flight phases with different characteristics were identified when approximately equal numbers of weevils were trapped. These were between mid-August and early December (overwintered weevils), between early December and mid-March (first summer generation weevils) and mid-March and mid-May (first and second generation weevils). The proportion of individuals with developed flight musculature wasc. 8% in the first phase and 30% in the last phase; muscle development was delayed in the mid-phase. First phase weevils with flight muscles werec. 20 times more likely to fly than those in the last. A very weak inverse relationship was observed between developed flight musculature and the presence or absence of eggs. Similarly, there was a very weak inverse relationship between weevil ground densities and the proportion with developed flight muscles. Levels of parasitism byMicroctonus hyperodaeLoan amongst trapped weevils were far less than that on the ground, indicating that it inhibits flight and may explain the relatively slow dispersal of the parasitoid. It was concluded that the adaptive implications of flight could be linked to escape responses from desiccating microclimates rather than dispersal from crowded habitats.

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8

Patchett, B. J., R. B. Chapman, L. R. Fletcher e S. R. Gooneratne. "Endophyteinfected Festuca pratensis containing loline alkaloids deters feeding by Listronotus bonariensis". New Zealand Plant Protection 61 (1 agosto 2008): 205–9. http://dx.doi.org/10.30843/nzpp.2008.61.6843.

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Meadow fescue Festuca pratensis infected with Neotyphodium uncinatum contains loline alkaloids that may deter attack from pasture insects In a field experiment conducted in Canterbury high leaf loline alkaloid concentration reduced damage by Argentine stem weevil (ASW; Listronotus bonariensis) adults to 12 unique endophyteinfected meadow fescue ecotypes at four assessment times (DecApr; R2adj 489 P

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9

Blodgett, Sue L., Patricia M. Denke, Michael A. Ivie, Charles W. O’Brien e Andrew W. Lenssen. "LISTRONOTUS MONTANUS DIETZ (COLEOPTERA: CURCULIONIDAE) DAMAGING SPRING WHEAT IN MONTANA". Canadian Entomologist 129, n. 2 (aprile 1997): 377–78. http://dx.doi.org/10.4039/ent129377-2.

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Listronotus montanus (Dietz) is a little known species, distributed in central North America. O'Brien and Wibmer (1982) record its occurrence from Indiana west to Nevada and north to the Prairie Provinces. In Montana, it occurs widely in grasslands east of the Continental Divide (Montana Entomological Collection, unpublished), but is also recorded from Saunders Co. in western Montana (Russell 1968). Nothing has been reported on the biology of this species, but it has been observed on grasses in the Cypress Hills of Alberta (CWOB unpublished). We report the occurrence of this species as a potential pest of small grains.

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10

Vittum, P. J., e H. Tashiro. "Seasonal Activity of Listronotus maculicollis (Coleoptera: Curculionidae) on Annual Bluegrass". Journal of Economic Entomology 80, n. 4 (1 agosto 1987): 773–78. http://dx.doi.org/10.1093/jee/80.4.773.

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11

Mcneill, M. R., D. E. Hume, R. Ashby, M. Ashby, P. Brandon, P. Guscott, B. Tosswill e R. Barton. "Ryegrass production in Wairarapa, New Zealand: is biological control of Argentine stem weevil important?" NZGA: Research and Practice Series 13 (1 gennaio 2007): 301–6. http://dx.doi.org/10.33584/rps.13.2006.3148.

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To investigate the interaction between Argentine stem weevil (Listronotus bonariensis), its parasitoid Microctonus hyperodae, fungal endophyte (Neotyphodium lolii) and its grass host, four endophyte-ryegrass (Lolium perenne) treatments were established on four farms in Wairarapa in autumn 2003. A diploid ryegrass contained either wild-type or AR1 endophyte or was endophytefree, while a tetraploid ryegrass contained AR1 endophyte. Wild-type, AR1 and endophyte-free ryegrasses average 52%, 91% and 2% endophyte-infected tillers for the 3 years of measurement. Moderate increases over time in the proportion of wild-type infected tillers indicated selection pressures favoured endophyte-infected tillers. Endophyte-free tiller populations were 11% lower than AR1 or wild-type but not significantly so. L. bonariensis populations were highest in endophyte-free and wild-type pastures and 80% lower in AR1 pastures. Mean rates of parasitism in L. bonariensis were lower in spring (9%) than autumn (35%), tended to be higher in wild-type than in AR1 diploid ryegrass, and only had a weak relationship with percent endophyte-infection. Keywords: endophyte, Neotyphodium lolii, Lolium perenne, dry matter yields, plant persistence, Listronotus bonariensis, Microctonus hyperodae

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12

Stevenson, A. B. "RELATIONSHIP BETWEEN TEMPERATURE AND DEVELOPMENT OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LeCONTE) (COLEOPTERA: CURCULIONIDAE), IN THE LABORATORY". Canadian Entomologist 118, n. 12 (dicembre 1986): 1287–90. http://dx.doi.org/10.4039/ent1181287-12.

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AbstractRates of development of selected stages and complete development of the carrot weevil, Listronotus oregonensis (LeConte), were determined in the laboratory at controlled temperatures ranging from 17.5 to 30°C. Within that range of temperature, rates of development increased with temperature. Fitting the data to a cubic polynomial function provided an excellent description of the relationship between temperature and rate of development for all stages as shown by R2 values of at least 0.98.

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13

Ferguson, C. M., A. A. Evans e B. I. P. Barratt. "Phenology of Listronotus bonariensis (Kuschel) (Coleoptera: Curculinonidae) in Otago". Proceedings of the New Zealand Plant Protection Conference 49 (1 agosto 1996): 270–74. http://dx.doi.org/10.30843/nzpp.1996.49.11454.

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14

Prestidge, R. A., e S. G. Van Der Zijpp. "Argentine stem weevil (Listronotus bonariensis) survival in the central North Island". New Zealand Journal of Agricultural Research 28, n. 1 (gennaio 1985): 133–40. http://dx.doi.org/10.1080/00288233.1985.10427007.

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15

Zhao, D. X., R. K. Stewart e Guy Boivin. "Analysis of Time-Varying Survival Rates of Listronotus oregonensis (Coleoptera: Curculionidae)". Environmental Entomology 20, n. 5 (1 ottobre 1991): 1333–43. http://dx.doi.org/10.1093/ee/20.5.1333.

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16

LeBlanc, J. P. R., e G. Boivin. "A note on the detection of the carrot weevil in Nova Scotia". Phytoprotection 74, n. 2 (12 aprile 2005): 113–15. http://dx.doi.org/10.7202/706041ar.

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Abstract (sommario):

The carrot weevil, Listronotus oregonensis [Coleoptera: Curculionidae], is a significant pest of vegetable crops in northeastern North America. However, the species had not been previously detected in Atlantic Canada. In 1985,1986, and 1988, attempts to detect this pest in Nova Scotia were unsuccessful. In 1992, in one of three carrot (Daucus carota) fields monitored using thigmotactic wooden-plate traps baited with fresh carrots, six individuals were captured during the spring migration of the inseetfrom overwintering sites into a carrot field near Great Village, Nova Scotia.

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17

Majka, Christopher G., Robert S. Anderson, Donald F. McAlpine e Reginald P. Webster. "The weevils (Coleoptera: Curculionoidea) of the Maritime Provinces of Canada, I: New records from New Brunswick". Canadian Entomologist 139, n. 3 (giugno 2007): 378–96. http://dx.doi.org/10.4039/n06-008.

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AbstractSeventy-seven species of weevils are newly reported in New Brunswick, increasing the known provincial fauna to 206 species. Trichapion nigrum (Herbst), Ceutorhynchus semirufus LeConte, and Listronotus laramiensis (Angell) are recorded for the first time in Canada. Three species, Bagous planatus LeConte, Plocamus hispidulus LeConte, and Dryocoetes granicollis (LeConte), are removed from the province's faunal list. Components of the fauna are discussed with a particular focus on the introduced species found in the province. Monitoring to detect changes of both native and introduced species is emphasized.

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18

Boivin, Guy. "EVALUATION OF MONITORING TECHNIQUES FOR THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (COLEOPTERA: CURCULIONIDAE)". Canadian Entomologist 117, n. 8 (agosto 1985): 927–33. http://dx.doi.org/10.4039/ent117927-8.

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AbstractFive trap designs were evaluated for their efficiency in capturing overwintering adults of the carrot weevil, Listronotus oregonensis (Le Conte). Trap catches were compared with counts of oviposition and nutrition cavities found in carrots placed on the ground. A trap consisting of 22 wooden plates, separated by metal washers and placed over a carrot which was used as bait, proved to be the most efficient. The weevils crawl between the plates, feed on the carrot, and are collected by dismantling the trap over a pan. This technique provided a seasonal record of carrot-weevil activity comparable to that obtained with carrot sections and can be used to issue insecticide-treatment recommendations prior to the beginning of the carrot-weevil oviposition period.

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19

Barker, G. M., R. A. Prestidge e R. P. Pottinger. "Reproductive phenology of Listronotus bonariensis (Kuschel) (Coleoptera:Curculionidae) in northern New Zealand pastures". Bulletin of Entomological Research 78, n. 4 (dicembre 1988): 659–68. http://dx.doi.org/10.1017/s0007485300015510.

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AbstractThe reproductive phenology of Listronotus bonariensis (Kuschel) in the north of North Island, New Zealand, was studied by dissection of adults collected at intervals from several sites. First-generation adults exhibited reproductive development and activity, followed by gonad atrophication and death. Most second-generation adults entered directly into oligopause in the autumn. Some early emergent weevils of this generation oviposited before onset of winter and reproductive dormancy. Oligopause was not intense, and reproductive maturity was gradually attained over the winter, with resumption of egg laying in early spring. These results are discussed in relation to population reproductive biology and survival.

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20

Williams, C. Lenney, S. L. Goldson e D. W. Bullock. "Unusual mitochondrial genome in introduced and native populations of Listronotus bonariensis (Kuschel)". Heredity 77, n. 6 (dicembre 1996): 565–71. http://dx.doi.org/10.1038/hdy.1996.183.

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21

Diaz, Maria Derval C., e Daniel C. Peck. "Overwintering of annual bluegrass weevils, Listronotus maculicollis, in the golf course landscape". Entomologia Experimentalis et Applicata 125, n. 3 (dicembre 2007): 259–68. http://dx.doi.org/10.1111/j.1570-7458.2007.00621.x.

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22

Grafius, E., e R. D. Collins. "Overwintering Sites and Survival of the Carrot Weevil, Listronotus oregonensis (Coleoptera: Curculionidae)". Environmental Entomology 15, n. 1 (1 febbraio 1986): 113–17. http://dx.doi.org/10.1093/ee/15.1.113.

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23

Barker, G. M., R. P. Pottinger e P. J. Addison. "Flight Behavior of Listronotus bonariensis (Coleoptera: Curculionidae) in the Waikato, New Zealand". Environmental Entomology 18, n. 6 (1 dicembre 1989): 996–1005. http://dx.doi.org/10.1093/ee/18.6.996.

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24

Wu, Shaohui, Olga S. Kostromytska, Fangsen Xue e Albrecht M. Koppenhöfer. "Chilling effect on termination of reproductive diapause in Listronotus maculicollis (Coleoptera: Curculionidae)". Journal of Insect Physiology 104 (gennaio 2018): 25–32. http://dx.doi.org/10.1016/j.jinsphys.2017.11.005.

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25

Gagnon, Annie-Ève, Guy Boivin e Suzanne Blatt. "Response of carrot weevil (Listronotus oregonensis) to different host-plant essential oils". Crop Protection 149 (novembre 2021): 105763. http://dx.doi.org/10.1016/j.cropro.2021.105763.

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26

Boivin, Guy. "ANAPHES SORDIDATUS (GIRAULT) (HYMENOPTERA: MYMARIDAE), AN EGG PARASITE OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LE CONTE)". Canadian Entomologist 118, n. 4 (aprile 1986): 393–94. http://dx.doi.org/10.4039/ent118393-4.

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The carrot weevil, Listronotus oregonensis (Le Conte), is an important pest of carrot and celery in eastern Canada (Stevenson 1985). In Quebec, it is univoltine and overwinters as adults (Boivin 1985). At present, the only way to control this pest is with chemical insecticides applied either as granules at seeding time to control the larvae or as foliar sprays to control the adults before they start to oviposit. If integrated pest management (IPM) programs are to be applied to crops attacked by the carrot weevil, additional control methods are needed.

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27

Barker, Gary M. "Predation on aphids by the herbivorous Weevil Listronotus bonariensis (Kuschel) (Coleoptera: Curculionidae, Brachycerinae)". Coleopterists Bulletin 60, n. 2 (giugno 2006): 164–65. http://dx.doi.org/10.1649/875.1.

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28

Wu, S., O. S. Kostromytska e A. M. Koppenhöfer. "Effect of temperature on post-diapause reproductive development in Listronotus maculicollis (Coleoptera: curculionidae)". Bulletin of Entomological Research 109, n. 05 (5 agosto 2019): 669–77. http://dx.doi.org/10.1017/s0007485318001025.

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AbstractThe annual bluegrass weevil Listronotus maculicollis requires chilling exposure to terminate reproductive diapause during overwintering, but the effects of temperature on its post-diapause development in spring remain unclear. To explore this effect, overwintering adults were transferred from cold conditions (6°C/4°C, L:D 10:14) to different warm-up temperatures at L:D 12:12. When weevils were transferred to 7, 14 and 21°C in December and late January, the sizes of male and female reproductive organs were significantly smaller at 7°C than at 14 and 21°C. When weevils were transferred to 7, 9, 11, 13 and 15°C in late January, higher temperatures facilitated the post-diapause development. In both sexes, the sizes of reproductive organs and developmental rate increased with temperature. Reproductive organs did not grow significantly at 7°C in males and at 7–9°C in females, at which the percentage of developing weevils remained low. The time required for 50% of individuals to resume development was 44, 18, 13 and 8 days at 9, 11, 13 and 15°C, respectively, in males and 19, 14 and 8 days at 11, 13 and 15°C, respectively, in females. The threshold temperature for post-diapause development was 7.8°C in males, based on which 61.7 degree-days coincided with 50% of individuals developing. Under field conditions, the percentage of male and female maturity and insemination rate were low until early March, but all reached 100% by late March.

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29

Barker, G. M., e P. J. Addison. "Sampling Argentine stem weevil,Listronotus bonariensis(Kuschel), populations in pasture: the egg stage". New Zealand Journal of Agricultural Research 33, n. 4 (ottobre 1990): 649–59. http://dx.doi.org/10.1080/00288233.1990.10428469.

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30

Saadé, F. E., G. B. Dunphy e R. L. Bernier. "Response of the Carrot Weevil,Listronotus oregonensis(Coleoptera: Curculionidae), to Strains ofBacillus thuringiensis". Biological Control 7, n. 3 (dicembre 1996): 293–98. http://dx.doi.org/10.1006/bcon.1996.0097.

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31

Kostromytska, Olga S., Cesar Rodriguez-Saona, Hans T. Alborn e Albrecht M. Koppenhöfer. "Role of Plant Volatiles in Host Plant Recognition by Listronotus maculicollis (Coleoptera: Curculionidae)". Journal of Chemical Ecology 44, n. 6 (9 maggio 2018): 580–90. http://dx.doi.org/10.1007/s10886-018-0964-y.

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32

Todd, J. H., L. A. Malone, H. S. Gatehouse, E. P. J. Burgess, J. T. Christeller, B. A. Philip e E. L. Tregidga. "Effects of two protease inhibitors on larvae of Argentine stem weevil and clover root weevil". New Zealand Plant Protection 55 (1 agosto 2002): 416–20. http://dx.doi.org/10.30843/nzpp.2002.55.3917.

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Abstract (sommario):

Protease inhibitors (PIs) cause mortality in a range of insects and transgenic plants expressing PIs have been protected against pest attack The effects of feeding two purified PIs to larvae of Argentine stem weevil (Listronotus bonariensis) and clover root weevil (Sitona lepidus) were investigated in laboratory bioassays The serine PI aprotinin and the cysteine PI E64 were administered continuously in artificial diets to neonate or oneweekold larvae Aprotinin had no effect on clover root weevil larvae but significantly inhibited growth of Argentine stem weevil larvae E64 caused significant mortality in clover root weevil larvae and significant reductions in growth of Argentine stem weevil larvae

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33

Vattala, H. D., S. D. Wratten, C. B. Phillips, E. L. Wackers e S. P. Worner. "Measuring parasitoid carbohydrate levels to improve biological control". New Zealand Plant Protection 58 (1 agosto 2005): 135–39. http://dx.doi.org/10.30843/nzpp.2005.58.4286.

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Abstract (sommario):

Lifetime carbohydrate levels were compared in the laboratory between unfed and honeyfed Microctonus hyperodae (Hymenoptera Braconidae) a parasitoid of the Argentine stem weevil Listronotus bonariensis (Coleoptera Curculionidae) High performance liquid chromatography (HPLC) was used to analyse sugars in individual parasitoids and showed that fed and unfed parasitoids can be distinguished by measuring the total sugar levels Furthermore the fructose/total sugar ratio (f/T) of honeyfed M hyperodae was always higher than that of the unfed individuals This method should prove very useful for determining the nutritional status of fieldcollected parasitoids and for evaluating the benefits gained by parasitoids through the provision of floral resources in the field

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34

Dionne, Julie, Guy Bélair, S. Patricia Stock, Louis Simard e Hervé Mauléon. "Natural occurrence of entomopathogenic nematodes (Rhabditida: Steinernematidae) on golf courses in eastern Canada". Nematology 9, n. 3 (2007): 325–32. http://dx.doi.org/10.1163/156854107781352070.

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AbstractA survey of entomopathogenic nematodes from 38 golf courses was conducted in different climatic areas of Ontario and Québec provinces, Canada, during autumn 2002 and 2003. Soil samples were collected on golf course greens, fairways and roughs. Entomopathogenic nematodes were isolated from soil using wax moth (Galleria mellonella) and carrot weevil (Listronotus oregonensis) larvae as bait. Of the 436 samples (218 sites), 11 contained entomopathogenic nematodes for this study. All entomopathogenic nematode-positive samples were isolated from roughs. Isolates were characterised using DNA satellite probes and 28S rDNA sequence data. Both methods confirmed the identities of nematode isolates as Steinernema carpocapsae, S. feltiae and S. kraussei.

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35

Parra, Leonardo, Manuel Chacón, Marcelo Lizama e Andrés Quiroz. "Incidence of Listronotus bonariensis (Coleoptera: Curculionidae) in ryegrass pastures from southern Chile. New background". Journal of soil science and plant nutrition, ahead (2017): 0. http://dx.doi.org/10.4067/s0718-95162017005000007.

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36

Williams, C. Lenney, S. L. Goldson, D. B. Baird e D. W. Bullock. "Geographical origin of an introduced insect pest, Listronotus bonariensis (Kuschel), determined by RAPD analysis". Heredity 72, n. 4 (1 aprile 1994): 412–19. http://dx.doi.org/10.1038/hdy.1994.57.

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37

Addison, P. J. "Sampling Argentine stem weevil,Listronotus bonariensis(Kuschel), populations in pasture: The soil-dwelling stages". New Zealand Journal of Agricultural Research 32, n. 1 (gennaio 1989): 95–103. http://dx.doi.org/10.1080/00288233.1989.10423482.

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38

Edelson, J. V. "Biology of a Carrot Weevil, Listronotus texanus (Coleoptera: Curculionidae): Range and Seasonality of Infestations". Journal of Economic Entomology 78, n. 4 (1 agosto 1985): 895–97. http://dx.doi.org/10.1093/jee/78.4.895.

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39

McNeill, Mark R., Patricia J. Vittum e David B. Baird. "Suitability of Listronotus maculicollis (Coleoptera: Curculionidae) as a Host for Microctonus hyperodae (Hymenoptera: Braconidae)". Journal of Economic Entomology 92, n. 6 (1 dicembre 1999): 1292–300. http://dx.doi.org/10.1093/jee/92.6.1292.

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40

Boivin, Guy, e Jean-Pierre Nénon. "Variability and inheritance of the chorionic tubercles on eggs of Listronotus oregonensis (Coleoptera: Curculionidae)". Canadian Entomologist 135, n. 6 (dicembre 2003): 765–74. http://dx.doi.org/10.4039/n03-008.

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Abstract (sommario):

AbstractThe tubercles present on the egg chorion of the carrot weevil, Listronotus oregonensis (LeConte), are described and their variability in density quantified between females. Tubercle density varied by a factor of six between females, from 19 000 to 115 000 tubercles per mm2. The average density of tubercles for a given female remained constant throughout its oviposition period. When isofemale lines were created, the average tubercle density remained constant from generation to generation, and crossing experiment suggested that tubercle density was transmitted by the female. Using isofemale lines with low and high densities of tubercles, no effect on egg survival in water or susceptibility to egg parasitism was found. Tubercle density and the heritability of this character suggest a probable reproductive advantage for females that produce eggs with this chorionic pattern even though the precise role of these traits remains to be determined.

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41

Gerard, P. J. "Ryegrass endophyte infection affects Argentine stem weevil adult behaviour and susceptibility to parasitism". New Zealand Plant Protection 53 (1 agosto 2000): 406–9. http://dx.doi.org/10.30843/nzpp.2000.53.3654.

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Abstract (sommario):

Pot experiments were undertaken to investigate whether Argentine stem weevil Listronotus bonariensis adults placed on endophyteinfected or endophytefree perennial ryegrass (Lolium perenne) exhibited behaviour differences that may lead to differing susceptibility to attack by the endoparasitoid Microctonus hyperodae There was no difference (P>005) in the behaviour of weevils on pots of Nui ryegrass infected with either the wildtype endophyte Neotyphodium lolii or AR1 a N lolii selection high in peramine but low in other key alkaloids Although adults were offered no choice over 60 of the adults were found off endophyteinfected plants during the observation period Weevils on high endophyte plants were found to spend less time in positions highly favourable for parasitoid oviposition (eg feeding P

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42

Stevenson, A. B., e E. S. Barszcz. "A COMPARISON OF THREE METHODS OF MONITORING THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LECONTE) (COLEOPTERA: CURCULIONIDAE)". Canadian Entomologist 129, n. 1 (febbraio 1997): 187–94. http://dx.doi.org/10.4039/ent129187-1.

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Abstract (sommario):

AbstractThe carrot weevil, Listronotus oregonensis (LeConte), was monitored at 11 research or commercial carrot plantings at Holland Marsh, Kettleby, Ontario, using three methods, i.e. wooden plate (Boivin) traps to capture adults, carrot root sections placed in the soil to detect oviposition, and recording the numbers of adults present on carrot root sections. All three methods provided similar records of the seasonal pattern of adult activity. At most sites, thresholds used to determine the need for insecticide applications were reached or exceeded soon after the beginning of monitoring.There were significant linear relationships among the seasonal activity parameters generated by the three methods and between those parameters and percentage injury at harvest. Control programs that would have resulted from the use of each method are discussed.

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43

Bonham, Melissa, Gerald M. Ghidiu, Erin Hitchner e Elwood L. Rossell. "Effect of Seed Treatment, In-furrow, and Foliar Application of Insecticides on the Carrot Weevil in Processing Carrot". HortTechnology 19, n. 3 (gennaio 2009): 617–19. http://dx.doi.org/10.21273/hortsci.19.3.617.

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Abstract (sommario):

Field studies were conducted in 2004 and 2005 to determine the effectiveness of a seed treatment, an in-furrow treatment, and foliar applications of insecticides for control of the carrot weevil [Listronotus oregonensis (Coleoptera: Curculionidae)] in processing carrot (Daucus carota). Carrot seed treated with fipronil resulted in significantly less root damage at harvest then did the in-furrow application of thiamethoxam or multiple foliar applications of diazinon or spinosad in both years, and resulted in significantly higher yields compared with all other treatments in 2004. Seed treatments with fipronil should be considered for future registration on carrot. Such registration would allow early to midseason protection of carrot from weevil damage and compliment the current management program of foliar sprays to control adult weevils.

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44

Huber, John T., Sylvain Côté e Guy Boivin. "DESCRIPTION OF THREE NEWANAPHESSPECIES (HYMENOPTERA: MYMARIDAE), EGG PARASITOIDS OF THE CARROT WEEVIL,LISTRONOTUS OREGONENSIS(LECONTE) (COLEOPTERA: CURCULIONIDAE), AND REDESCRIPTION OFANAPHES SORDIDATUSGIRAULT". Canadian Entomologist 129, n. 5 (ottobre 1997): 959–77. http://dx.doi.org/10.4039/ent129959-5.

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Abstract (sommario):

AbstractThree new mymarid egg parasitoids of the carrot weevil,Listronotus oregonensis(LeConte) (Coleoptera: Curculionidae), are described:Anaphes coteiHuber from Nova Scotia;Anaphes listronotiHuber from Quebec; andAnaphes victusHuber from Quebec, Michigan, and Texas. A key to the species is given.Anaphes sorditatus(Girault), with which at least one of the new species was previously confused, is redescribed. Althoughlistronotiandsorditatuscannot presently be distinguished morphologically, they are biologically distinct and have different hosts. Crosses between malesordidatusand femalevictusyielded female offspring in 27% of the tests but none in the reciprocal crosses. The corresponding control crosses resulted in 90 and 30% female offspring. Mating did not occur in attempts to crosssordidatuswithlistronoti. On three occasions an unidentified species ofAnagruswas reared from field-collected carrot weevil eggs. This represents the first report of anAnagrusspecies from Curculionidae.

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45

Zhao, D. X., G. Boivin e R. K. Stewart. "SIMULATION MODEL FOR THE POPULATION DYNAMICS OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LECONTE) (COLEOPTERA: CURCULIONIDAE)". Canadian Entomologist 123, n. 1 (febbraio 1991): 63–76. http://dx.doi.org/10.4039/ent12363-1.

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Abstract (sommario):

AbstractA simulation model was developed for the population dynamics of a carrot weevil, Listronotus oregonensis (LeConte), population on muck-grown carrots. The model includes mortality rates of eggs, larvae, and pupae for different sowing dates of carrots. It also incorporates the overwintered adult density, the temperature-dependent growth rates of the above-mentioned life stages, the age-, temperature-, and phenology-dependent oviposition rates, and the impact of an egg parasitoid, Anaphes sordidatus (Girault), on egg mortality rates. Model output was evaluated by comparing simulated results with observed results on the seasonal totals and time of population peaks of the egg and larval populations. The mean percentage differences between the simulated and observed seasonal egg totals were 3.1 ± 0.66 (SE) in 1987 and 1988, and 4.2 ± 0.05 in 1989. They were not statistically different. The mean percentage differences between the simulated and observed seasonal larval totals were 10 ± 3.33 in 1987 and 1988 and 29.8 ± 0.66 in 1989. Independent data sets (i.e. field data in 1989) showed a significant increase in the simulation error of the larval population. Sensitivity analysis indicated that A. sordidatus had a large influence on the population dynamics of L. oregonensis.

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46

Kehrli, P., e C. B. Phillips. "Massemergence devices to improve synchrony between Listronotus bonariensis and Microctonus hyperodae". New Zealand Plant Protection 59 (1 agosto 2006): 172–77. http://dx.doi.org/10.30843/nzpp.2006.59.4535.

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Abstract (sommario):

A novel approach to conserving and augmenting parasitoids involves storing large numbers of parasitised hosts in massemergence devices After eclosing inside the device parasitoid adults which are generally smaller than their hosts are allowed to escape through a mesh screen while any unparasitised hosts remain trapped The goal of this study was to assess the potential of massemergence devices both for augmenting populations of the parasitoid Microctonus hyperodae and for manipulating its synchrony with its host the Argentine stem weevil Listronotus bonariensis The experiments demonstrated that a screen with a 900 micro;m by 900 micro;m mesh is appropriate to separate parasitoid adults from their hosts and that a device of very simple design could be effective However the survival of L bonariensis and M hyperodae was reduced by cool storage and food deprivation and further development is required to overcome these limitations

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47

Goldson, S. L., M. C. Barron, J. M. Kean e C. van Koten. "Argentine stem weevil (Listronotus bonariensis, Coleoptera: Curculionidae) population dynamics in Canterbury, New Zealand dryland pasture". Bulletin of Entomological Research 101, n. 3 (21 dicembre 2010): 295–303. http://dx.doi.org/10.1017/s0007485310000507.

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Abstract (sommario):

AbstractThe Argentine stem weevil (Listronotus bonariensis) was an economically important pest in New Zealand pastures until the release of the parasitoidMicroctonus hyperodae. This contribution uses historical data to investigate the regulation of the pest populations prior to, and somewhat during, the establishment of this parasitoid in dryland Canterbury, New Zealand. Thus, a significant goal of this study is to provide anL. bonariensispopulation dynamics baseline for any future work that aims to analyse the full effects ofM. hyperodaeon the weevil, now that equilibrium with the weevil host has been reached.The population dynamics ofL. bonariensis, based on a life-table approach, were investigated using data collected regularly for eight years from populations in Canterbury, New Zealand. The key factor affecting end-of-seasonL. bonariensisdensity was found to be variation in second generation fourth instar prepupal and pupal mortality. This may have been caused by arrested development and ongoing mortality resulting from the onset of cooler autumnal conditions.A compensatory response was found in recruitment to the second summer weevil generation, whereby the realised fecundity of the emergent first summer generation of weevils was found to be negatively related to the density of adult weevils per ryegrass tiller. This is the first time that this has been found via long-term population analysis ofL. bonariensis, although indications of this have been found elsewhere in caging, pot and small plot experiments.In this study, the effect of the parasitoid biocontrol agentMicroctonus hyperodaeonL. bonariensispopulation dynamics was unclear, as the analysis covered a period when the parasitoidMicroctonus hyperodaewas introduced and still establishing. It does, however, raise important questions for future analysis in terms of the interaction between parasitism and unrealised fecundity.The results in this contribution also highlighted regional differences. Overwintering mortality of adult weevils in Canterbury was constant between years, whilst earlier studies in the North Island Waikato region indicated this mortality was density dependent. In addition, the availability of tillers in endophyte-free ryegrass pastures in Canterbury had no influence on egg and early-instar larval survival, which contrasts with the finding from endophytic Waikato pastures.

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48

Barker, G. M. "Effect of temperature on development and survival of Argentine stem weevil (Listronotus bonariensis) immature stages". New Zealand Journal of Zoology 15, n. 3 (luglio 1988): 387–90. http://dx.doi.org/10.1080/03014223.1988.10422964.

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49

Ramoutar, Darryl, Richard S. Cowles e Steven R. Alm. "Pyrethroid Resistance Mediated by Enzyme Detoxification in Listronotus maculicollis (Coleoptera: Curculionidae) From Connecticut". Journal of Economic Entomology 102, n. 3 (1 giugno 2009): 1203–8. http://dx.doi.org/10.1603/029.102.0345.

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50

Woodson, W. D., e J. V. Edelson. "Developmental Rate as a Function of Temperature in a Carrot Weevil, Listronotus texanus (Coleoptera: Curculionidae)". Annals of the Entomological Society of America 81, n. 2 (1 marzo 1988): 252–54. http://dx.doi.org/10.1093/aesa/81.2.252.

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