Lepidoptera genitalia

About: Lepidoptera genitalia is a research topic. Over the lifetime, 10114 publications have been published within this topic receiving 78876 citations. The topic is also known as: Uncus.

Analysis of Resistance in Cabbage Varieties to Damage by Lepidoptera and Thysanoptera

Abstract: Differences in susceptibility to damage by Thrips tabaci Lindeman and the lepidopteran pest complex (Plutella xylostella (L.), Artogeia rapae (L.), and Trichoplusia ni (Hubner)) were documented and analyzed for fresh market and experimental cabbage varieties. Patterns of resistance to damage were different for Lepidoptera and T. tabaci . The commercial green varieties did not differ in susceptibility to damage by Lepidoptera but did differ in susceptibility to damage by T. tabaci . The two experimental varieties and one commercial red variety, used for comparison, were less susceptible to damage by Lepidoptera but varied in susceptibility to damage by T. tabaci . The best regression models for predicting damage rating, without including the effect of variety, included one measure of seasonal pest total and one plant parameter, head weight. Further regression analysis showed that, in most cases, the relationship of seasonal pest total to damage had the same slope for all varieties but different intercepts. This result indicates that, at a given population density, the models predict different damage ratings for the varieties, implying that nonpreference is not the only resistance mechanism operating and that mechanisms involving tolerance or antibiosis were involved. Use of regression models that test for varietal differences in the relationship of plant parameters and pest population densities to damage would be helpful in designing good assays of resistance for selection of new breeding lines.

Sex pheromone responses of choristoneura spp. and their hybrids (lepidoptera: tortricidae)

Abstract: Field studies in Ontario, Oregon, and California on interspecific attraction and inhibition among the coniferophagous species of Choristoneura (the spruce budworm and its allies) confirmed specific pheromonal differences among the species Of the three species that are mutually attractive and whose males are attracted by blends of trans - and cis -11-tetradecenal, C fumiferana , C biennis , and C occidentalis , catches of C fumiferana males in traps baited with C fumiferana females were significantly reduced by the presence of females from a second group in which it is believed the females produce trans -11-tetradecenyl acetate Catches of C occidentalis males by C occidentalis females were not affected in this way F 1 hybrids and backcrosses between an aldehyde-producing species and an acetate-producing species produced females that were attractive to males of one or other of the parent species, although some females were not attractive to either Individual females never attracted males of both parent species, and of those that were attractive, more were attractive to males of the aldehyde species than to males of the acetate species The results suggest sex-controlled inheritance and expression