Biotic performances of thelytokous and arrhenotokous strains of Thrips tabaci (Thysanoptera: Thripidae) showing resistance to cypermethrin |
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| Authors: | Misato Aizawa Takeo Watanabe Akemi Kumano Kumie Tamagaki Shoji Sonoda |
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| Affiliation: | 1.Kagawa Agricultural Experiment Station,Ayauta,Japan;2.Graduate School of Environmental and Life Science,Okayama University,Tsushima,Japan;3.Kagawa Prefecture Agricultural Cooperative Association,Takamatsu,Japan;4.School of Agriculture,Utsunomiya University,Utsunomiya,Japan |
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| Abstract: | Two distinct reproductive types of Thrips tabaci Lindeman, one thelytokous and one arrhenotokous, have been shown to develop target-insensitive cypermethrin resistance conferred by sodium channel mutation (T929I). In this study, we examined the relation between cypermethrin resistance and biotic performances of these reproductive types. Among the T. tabaci strains examined, resistant arrhenotokous strains became adults more quickly after hatching than resistant thelytokous strains. Female adults of resistant thelytokous strains exhibited shorter longevity and oviposited fewer eggs than those of susceptible strains of the same reproductive type. Resistant arrhenotokous strains exhibited similar longevity and fecundity to susceptible thelytokous strains. We further examined the relation between reproductive types and T929I using a total of 85 strains. All 53 arrhenotokous strains encoding T929I were judged to be cypermethrin resistant. Among 32 thelytokous strains with T929I, only four were regarded as cypermethrin resistant. Based on the results, we discuss possible mechanisms accounting for the recent prominence of arrhenotoky T. tabaci in Japan. |
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