Host Plants Dependent Prey Suitability of Predatory Lady Beetles
Keywords:Allelochemicals, Aphis gossypii, Chromolaena odorata, Menochilus sexmaculatus, Micraspis discolor
Host plantsÂ play an important role in the suitability of preys for development of predatory insects. The suitability ofÂ Aphis gossypii(Glover) (Hemiptera: Aphididae) from different host plant species,Â Solanum xanthocarpumÂ Schrad. and Wendl. (Solanaceae)andÂ Chromolaena odorataÂ (L.) (Asteraceae) as food sources for two lady beetle species,Â Menochilus sexmaculatusÂ Fab. andÂ Micraspis discolorÂ (Fabricius) (Coleoptera: Coccinellidae) was evaluated by examining the effect of prey consumption on the performance of lady beetle larvae. Results demonstrated thatÂ A. gossypiiÂ fromÂ S. xanthocarpumÂ was more suitably for larval growth thanÂ A. gossypiifromÂ C. odorata, with faster development time and higher larval survival of both lady beetle species. Consistent with the results of larval performance, larvae ofÂ M. sexmaculatusÂ showed feeding preference onÂ A. gossypiiÂ fromÂ S. xanthocarpumÂ overÂ A. gossypiifromÂ C. odorata.Â ForÂ M. discolor, however, longer development time of larvae when reared onÂ A. gossypiiÂ fromÂ C. odorataÂ result higher consumption onÂ A. gossypiiÂ fromÂ C. odorata.Â Regardless of lady beetle species and aphid, 4th larval instar was the most voracious.Â Menochilus sexmaculatusÂ was likely resistant to toxic of host plant of aphid,Â C. odorata, whileÂ M. discolorÂ was susceptible to noxious allelochemicals ofÂ C. odorataÂ distinctly. The different of essential prey and alternative prey of both lady beetle species was discussed in this study.
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