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Letteratura scientifica selezionata sul tema "Listronotus"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 febbraio 2022

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Articoli di riviste sul tema "Listronotus"

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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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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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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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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Abstract (sommario):

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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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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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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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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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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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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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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Più fonti

Tesi sul tema "Listronotus"

Cormier, Daniel. "Seasonal and chemical ecology of Anaphes listronoti and A. victus (Hymenoptera:Mymaridae), egg parasitoids of the carrot weevil, Listronotus oregonensis (Coleoptera:Curculionidae), in central Ontario". Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34935.

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Abstract (sommario):

The carrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), is an insect pest in carrot production in Ontario. The aim of this study was to survey the egg parasitoids attacking the carrot weevil in carrot fields in Ontario, and elucidate the seasonal and chemical ecology of these natural enemies.
Field surveys were conducted during three years in commercial carrot fields in the Holland Marsh and district marshes to detect the presence of carrot weevil egg parasitoids, to determine their geographical distribution and to evaluate the effect of insecticides on the rate of emergence and the activity of parasitoid adults. Two egg parasitoids, Anaphes listronoti Huber and A. victus Huber were found. The dominant species Anaphes listronoti is gregarious, was recovered from most of the sampled fields and was distributed in all sampled marshes whereas the solitary parasitoid A. victus was only sporadically found in the Holland Marsh. These Anaphes species occurred in carrot fields from the end of April to the beginning of September and seasonal parasitism averaged 33% in commercial carrot fields and up to 79% in an untreated plot. The insecticides phosmet, diazinon and cypermethrin used in carrot production, did not affect emergence rate of parasitoid adults indicating that immature stages are protected against insecticide penetration in the host egg. However, insecticide applications decreased parasitism rates and suggest a lethal effect on parasitoid adults by direct contact and insecticide residues, although no difference was observed between treatments.
Laboratory studies were performed to determine the existence of a sexual pheromone produced by female A. listronoti using a four-arm olfactometer. An automated system of insect tracking was developed to quantify male behavior in the olfactometer. The response of males to odor emitted by virgin females less than two days of age was measured. Virgin females less than one-day-old released a long-range pheromone from 4 hours until 16 hours after the onset of the photophase. Females of one and two days of age started to emit the sexual pheromone earlier than younger females.

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Cormier, Daniel. "Seasonal and chemical ecology of Anaphes listronoti and A. victus (Hymenoptera: mymaridae), egg parasitoids of the carrot weevil, Listronotus oregonensis (ColeopteraCurculionidae), in central Ontario". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0001/NQ44392.pdf.

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Baines, Danica Darlene Sonya. "Evaluation of adult carabid beetles (Coleoptera:Carabidae) as predators of the carrot weevil, Listronotus oregonensis (Coleoptera:Curculionidae)". Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63753.

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Zhao, Dingxin. "Mathematical models for the population dynamics and management of the carrot weevil, Listronotus oregonensis (LeConte) (Coleoptera:Curculionidae)". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74555.

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The time-varying survival rates of the carrot weevil, Listronotus oregonensis, were estimated by a new method. This method precluded the possibility of negative simulation survival rates. Analysis of carrot weevil population dynamics indicated that the egg mortality was density dependent with Anaphes sordidatus, an egg parasitoid, as a major density dependent factor. Larval mortality was less density dependent. Based on the mortality information, a simulation model for carrot weevil population dynamics was established. The simulation precision, evaluated by comparing simulated and observed egg and larval population dynamics, was satisfactory. Sensitivity analysis indicated that A. sordidatus had a large influence on carrot weevil population dynamics. The economic threshold for carrot weevil control in early carrots was 5 eggs/100 carrots at the peak population density. It ranged from 3.8 to 5.3 eggs/100 carrots in mid-season carrots depending on the selling price. A decision model showed that the best sowing date was after June 5 when risks were not considered. For risk aversion growers, sowing carrots between May 20 and May 31 was the best choice.

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Saade, Fabienne Eugenie Joseph. "Evaluation of strains of Bacillus thuringiensis as biological control agents of the adult stages of the carrot weevil, Listronotus oregonensis (Coleoptera:Curculionidae)". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=67541.

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Strains of Bacillus thuringiensis active against Coleoptera were evaluated for toxicity against the adult stage of the carrot weevil, Listronotus oregonensis. Mortality and frass bioassays using a suitable semi-artificial diet showed strains A30, A429 and BTT to be highly toxic. Mortality persisted after initial exposure to the bacteria with the survivors not resuming normal feeding. Attempts to reisolate B. thuringiensis from the insects revealed B. thuringiensis-like organisms in the gut and in/on other structures. At the midgut pH of the insect (pH 8.0), the crystals of the toxic strains were significantly more soluble in vitro than were crystals of the less toxic strain A311. Proteolytic activation of the crystals with gut extracts yielded a protein band (66-67 kDa) for strains A30 and A429 which was similar to he apparent molecular weight of the toxin protein for BTT. Evidence suggests that the low toxicity of strain A311 might be due, in part, to the absence of the toxic moiety of the $ delta$-endotoxin.

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Torres, Angel Nolberto. "Biology, ecology, and decision rules for Carrot Weevil, Listronotus Oregonensis (Leconte) (Coleoptera: Curculionidae) management in Parsley in the Great Lakes Region /". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488205318510151.

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Rhéaume, Ann-Julie. "Modélisation d'un écosystème agricole tritrophique : la carotte cultivée, le charançon de la carotte (Listronotus oregonensis) et Anaphes victus, un parasitoïde des oeufs". Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26879/26879.pdf.

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Cournoyer, Michel 1976. "Host selection behavior of the adult parasitoid Microctonus hyperodae Loan (Hymenoptera:Braconidae:Euphorinae) and the egg parasitoid Anaphes victus Huber (Hymenoptera:Mymaridae), parasitoids of the carrot weevil, Listronotus oregonensis LeConte (Coleoptera:Curculionidae)". Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80244.

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Abstract (sommario):

The carrot weevil, Listronotus oregonensis LeConte (Coleoptera: Curculionidae), is an important pest of carrot in northeastern North America. The objective of this study was to determine the host selection stimuli used by two L. oregonensis parasitoids: the adult parasitoid Microctonus hyperodae Loan and the egg parasitoid Anaphes victus Huber.
In the first chapter, the response of M. hyperodae females to various odor components from potential hosts and host plants was tested with a Y-olfactometer.
In the second chapter, the effect of L. oregonensis adult sex, feces and movement on host selection behavior of M. hyperodae females was evaluated by quantifying L. oregonensis adult movement and various M. hyperodae female behaviors in an arena.
In the third chapter, the response of A. victus females to different L. oregonensis related odor components was evaluated using a filter paper of which half was moistened with odor components and the other half with water.

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Stewart, Alan V. "Plant breeding aspects of ryegrasses (Lolium sp.) infected with endophytic fungi". Phd thesis, University of Canterbury. Lincoln College, 1987. http://theses.lincoln.ac.nz/public/adt-NZLIU20071005.172250/.

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Some aspects of the presence of systemic endophytic fungi in agriculturally important New Zealand grasses were studied in relation to plant breeding. Seedling resistance to adult Argentine stem weevil feeding in perennial ryegrass, Italian ryegrass and tall fescue was found to be related to the presence of their respective Acremonium endophytes in the seed rather than to plant genetic resistance. In addition a study of perennial ryegrass revealed that this resistance was independent of endophyte viability. The seedling resistance conferred by the endophyte of Italian ryegrass was found to be beneficial for field establishment. This endophyte differs from that in perennial ryegrass and tall fescue in that it does not confer resistance to Argentine stem weevil on mature plants, but only on seedlings. The extent of plant genetic seedling tolerance to adult Argentine stem weevil feeding was limited to broad inter-specific differences, with tall fescue more tolerant than perennial ryegrass and both of these more tolerant than Italian ryegrass. This ranking corresponds with previous observations on feeding preference on mature plants. A study of factors affecting the concentration of endophyte mycelia in infected seed of perennial ryegrass revealed that plant genetic factors had little effect. The major factors studied were: 1) the endophyte concentration in the maternal parent plant directly influenced the endophyte concentration in the seed. 2) nitrogen fertilizer applications to a seed crop reduced the concentration of mycelia in the seed, with earlier applications having a greater effect. 3) application of the fungicide propiconazole (Tilt) to a seed crop reduced the endophyte concentration in the seed. 4) the endophyte concentration in the seed was found to directly influence the endophyte concentration in seedlings, six month old plants and that of seed harvested from a first year seed crop. As there have been no previous reports of tetraploid perennial ryegrass cultivars with endophyte an experiment was conducted to determine if these could be developed by the standard procedure of colchicine treatment. The results revealed that endophyte was retained following colchicine treatment.

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Rothwell, Nikki Lynn. "Investigation into Listronotus maculicollis (Coleoptera: Curculionidae), a pest of highly maintained turfgrass". 2003. https://scholarworks.umass.edu/dissertations/AAI3096313.

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Listronotus maculicollis (Dietz) is a major pest of golf course turf in the northeastern United States. Because the larval stage of this insect causes considerable damage to short-mowed turfgrass, such as tees, greens, fairways, golf course superintendents rely on chemical applications for control. I investigated physiological, ecological, and behavioral characteristics of L. maculicollis to enhance management strategies that will lead to reduced insecticide inputs in golf course turf. Among the cool season turfgrass species, L. maculicollis larvae are reportedly found primarily in Poa annua L., annual bluegrass, among cool-season turfgrass species. To confirm this observation, I conducted a quantitative investigation to determine how abundant L. maculicollis larvae were in P. annua compared with other grasses. I also investigated the influence of mowing height and fertilization on the abundance of larvae. L. maculicollis larvae were present in highly maintained grasses (P. annua and Agrostis palustris Huds., creeping bentgrass) in field studies; no differences in numbers of larvae were detected between P. annua and two types of creeping bentgrass. However, in choice and no-choice tests among five grass types, L. maculicollis were significantly abundant in P. annua. Additionally, one study showed L. maculicollis larvae collected from P. annua weighed more than larvae from other grass types. I found a significant effect of fertilizer application. More L. maculicollis were collected in non-fertilized turf compared to fertilized turf, and more larvae were collected in short-mowed plots than from long-mowed plots. I also investigated adult spring emergence and the distribution of adults and larvae on turfgrass hosts. Golf course superintendents observe primary damage on perimeters of short-mowed areas. In an attempt to corroborate their observations, I examined the distribution of adults and larvae across the width of a golf course fairway, but no differences were detected. Although no more larvae were detected at fairway edges, we determined by visual assessment that the turf on the edge of the fairway was poorer quality, and substandard turf quality is often a result of pest, mechanical, or environmental damage. Therefore, from our results, larval feeding alone does not account for the increased damage in edge areas. I also established that adult L. maculicollis emerge from overwintering sites and walk onto host plants in the spring. These results will be utilized to develop perimeter treatment. (Abstract shortened by UMI.)

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Capitoli di libri sul tema "Listronotus"

Koppenhöfer, Albrecht, e Benjamin McGraw. "Biology and Management of the Annual Bluegrass Weevil, Listronotus maculicollis (Coleoptera". In Handbook of Turfgrass Management and Physiology, 335–50. CRC Press, 2007. http://dx.doi.org/10.1201/9781420006483.ch21.

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"Biology and Management of the Annual Bluegrass Weevil, Listronotus maculicollis (Coleoptera: Curculionidae)". In Handbook of Turfgrass Management and Physiology, 361–76. CRC Press, 2007. http://dx.doi.org/10.1201/9781420006483-33.

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Atti di convegni sul tema "Listronotus"

Telfer, Zachariah. "New issues emerging in Canadian carrot weevil (Listronotus oregonensis) control". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.109392.

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Kostromytska, Olga. "Annual bluegrass weevil,Listronotus maculicollis(Coleoptera: Curculionidae), insecticide resistance: Baseline susceptibility, cross-resistance patterns, and possible mechanisms". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.110862.

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Wu, Shaohui. "Additive or synergistic interactions between bifenthrin and an emulsifiable formulation ofBeauveria bassianaagainst insecticide-resistant annual bluegrass weevil, Listronotus maculicollis". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.111060.

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