Toxicity of 9 biopesticides to Triplax ainonia and their effects on mycelia growth of Pleurotus ostreatus
[Objective]Triplax ainonia is a fungal pest,which can cause serious harm to Pleurotus mushroom.In order to screen biological pesticides with high toxicity to T.ainonia and safety to Pleurotus ostreatus,this study explored the biological characteristics of T.ainonia,the toxicity of 9 biopesticides to T.ainonia and their effects on mycelia growth of P.ostreatus.The results would provide references for reasonable and effective control of T.ainonia on P.ostreatus.[Method]Based on spot survey and raising observation,the development periods and harmful characteristics of T.ainonia were analyzed.The indoor toxicity of 9 biopesticides to T.ainonia adults was determined by filter paper contact method and plate addition method,and indoor sensitivity of Pleurotus ostreatus mycelia to biopesticides was explored using the chemical insecticide lambda-cyhalothrin·emamectin benzoate,which was allowed to be used on edible fungi,as the control.[Result]As a complete metamorphosed insect,the ontogeny of T.ainonia went through four stages of egg,larva,pupa and adult.Both larvae and adults of T.ainonia could feed on frui-ting body of P.ostreatus and excreted large amounts of feces to pollute mushrooms.The toxicity test showed that spinosad and spinosad had high toxicity to T.ainonia adults with LC50 of 0.083 and 0.195 mg/L,respectively,which were higher than the control.The toxicity of azadirachtin,veratrine and pyre-thrins were lower than the control with LC50 of 4.249,5.327 and 9.135 mg/L,respectively.Rotenone,eu-calyptol,osthole and matrine had low toxicity to T.ainonia adults.The safety of tested pesticides to P.os-treatus was in the order of spinosad＞chlorofluoromethyl·emamectin benzoate＞matrine＞azadirachtin＞spinetoram＞rotenone＞eucalyptol＞pyrethrins＞osthole＞veratrine.[Conclusion]Spinosad,spinetoram and azadirachtin had high toxicity to T.ainonia adults and high safety to P.ostreatus growth,and they can be used as a potential insecticide for T.ainonia.
万方数据
维普
