Bibliografie tematiche / Argentine stem weevil

Letteratura scientifica selezionata sul tema "Argentine stem weevil"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 18 febbraio 2022

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Articoli di riviste sul tema "Argentine stem weevil"

1

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.

Testo completo
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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2

Harrop, Thomas W. R., Marissa F. Le Lec, Ruy Jauregui, Shannon E. Taylor, Sarah N. Inwood, Tracey van Stijn, Hannah Henry et al. "Genetic Diversity in Invasive Populations of Argentine Stem Weevil Associated with Adaptation to Biocontrol". Insects 11, n. 7 (14 luglio 2020): 441. http://dx.doi.org/10.3390/insects11070441.

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Abstract (sommario):
Modified, agricultural landscapes are susceptible to damage by insect pests. Biological control of pests is typically successful once a control agent has established, but this depends on the agent’s capacity to co-evolve with the host. Theoretical studies have shown that different levels of genetic variation between the host and the control agent will lead to rapid evolution of resistance in the host. Although this has been reported in one instance, the underlying genetics have not been studied. To address this, we measured the genetic variation in New Zealand populations of the pasture pest, Argentine stem weevil (Listronotus bonariensis), which is controlled with declining effectiveness by a parasitoid wasp, Microctonus hyperodae. We constructed a draft reference genome of the weevil, collected samples from a geographical survey of 10 sites around New Zealand, and genotyped them using a modified genotyping-by-sequencing approach. New Zealand populations of Argentine stem weevil have high levels of heterozygosity and low population structure, consistent with a large effective population size and frequent gene flow. This implies that Argentine stem weevils were able to evolve more rapidly than their biocontrol agent, which reproduces asexually. These findings show that monitoring genetic diversity in biocontrol agents and their targets is critical for long-term success of biological control.
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3

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.

Testo completo
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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4

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.

Testo completo
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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5

Stewart, A. V. "Perennial ryegrass seedling resistance to Argentine stem weevil". New Zealand Journal of Agricultural Research 28, n. 3 (luglio 1985): 403–7. http://dx.doi.org/10.1080/00288233.1985.10430445.

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6

Barker, G. M., e R. P. Pottinger. "Diel activity of the adult Argentine stem weevil". New Zealand Journal of Zoology 13, n. 2 (aprile 1986): 199–202. http://dx.doi.org/10.1080/03014223.1986.10422661.

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7

Phillips, C. B., I. I. Iline, M. W. A. Slay, M. R. McNeill e R. P. Cane. "Distribution and biotypic composition of the Argentine stem weevil parasitoid in Hawkes Bay". New Zealand Plant Protection 57 (1 agosto 2004): 298–303. http://dx.doi.org/10.30843/nzpp.2004.57.6925.

Testo completo
Abstract (sommario):
The Argentine stem weevil parasitoid Microctonus hyperodae Loan (Hymenoptera Braconidae) was first released in Hawkes Bay at two locations in 1995 In 2000 eight Hawkes Bay sites situated up to ca 55 km from the original release sites were surveyed to determine the presence of M hyperodae The parasitoid was recovered from all eight sites with the proportion of weevils parasitised at each site ranging from 1 to 44 Although parasitoids originating from east and west of the South American Andes mountains had been introduced to both Hawkes Bay release locations in 1995 genetic markers based on variation in malate dehydrogenase allozymes showed that eastern parasitoids predominated at all of the sites sampled in 2000 with western parasitoids occurring in low numbers at only three sites These results are compared with previous results from other New Zealand locations and their implications discussed
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8

Dymock, J. J., R. A. Prestidge e D. D. Rowan. "The effects of lolitrem B on Argentine stem weevil larvae". Proceedings of the New Zealand Weed and Pest Control Conference 42 (8 gennaio 1989): 73–75. http://dx.doi.org/10.30843/nzpp.1989.42.10999.

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9

Prestidge, R. A., G. M. Barker e R. P. Pottinger. "Observations on Argentine stem weevil mortalities in Volcanic Plateau pastures". New Zealand Entomologist 10, n. 1 (gennaio 1987): 64–68. http://dx.doi.org/10.1080/00779962.1987.9722512.

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10

Goldson, S. L., J. R. Proffitt, M. R. McNeill, C. B. Phillips, N. D. Barlow e D. B. Baird. "UnexpectedListronotus bonariensis(Coleoptera: Curculionidae) mortality in the presence of parasitoids". Bulletin of Entomological Research 94, n. 5 (ottobre 2004): 411–17. http://dx.doi.org/10.1079/ber2004314.

Testo completo
Abstract (sommario):
AbstractField enclosure and laboratory cage experiments designed to measure the impact of the parasitoidMicroctonus hyperodaeLoan on the Argentine stem weevil,Listronotus bonariensis(Kuschel) have shown that under high parasitoid pressure, there is significant weevil mortality without obvious parasitism. Parasitoid-exposed, but unparasitized portions of caged populations died at rates significantly higher than both the parasitized weevils from the same population and the unexposed controls. Unexpectedly, parasitized weevils had the lowest mortality rates (prior to larval parasitoid emergence). It was of ecological significance that this mortality effect was detected under field conditions using several years of empirically-collected population dynamics data. Under both field and laboratory conditions this mortality was found to occur within shorter time intervals than that required for full parasitoid larval development; thus it could not be attributed to the mortality that occurs after the emergence of prepupal parasitoids. The mechanism for this mortality remains undetermined, although it could possibly be linked to pseudoparasitism.
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Più fonti

Tesi sul tema "Argentine stem weevil"

1

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/.

Testo completo
Abstract (sommario):
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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