Indoor Toxicity Determination of Different Pesticides on Tetranychus dunchuangensis and Tetranychus truncatus
To clarify the toxic effects of different acaricides on significant cotton mites,Tetranychus dunchuan-gensis and Tetranychus truncatus in Aksu,Xinjiang,we utilized the slide-dip method recommended by the FAO to investigate the toxicity effects of nine acaricides on two species of spider mites,T.dunchuangensis and T.truncatus in Aksu,Xinjiang.The toxicity of nine acaricides towards female adult T.dunchuangensis increased with rising concentrations of the agents.The results indicated that abamectin demonstrated the highest toxicity against female adult T.dunchuangensis,LC50 is 0.013 4 μg/L.Spirotetramat,etoxazole and cyetpyrafen also exhibited high toxicity,LC50 are 16.593 μg/L,18.449 μg/L,and 29.370 μg/L,respectively;Fenpropathrin showed the lowest toxicity among the nine acaricides tested,LC50 is 636.291 μg/L.The toxicity of the remaining agents against female adult T.dunchuangensis fell between these values,specifically:pyridaben 104.854 μg/L,fenbutatin oxide 164.132μg/L,bifenazate 245.507 μg/L,and fenobucarb 435.702 μg/L.Abamectin also demonstrated the highest toxicity against female adult T.truncatus,LC50 is 0.203 μg/L.Pyridaben,bifenazate and spirotetramat showed greater toxicity towards T.truncatus,LC50 are 13.801 μg/L,19.596 μg/L,and 61.379 μg/L,respectively;Fenobucarb exhibited the lowest toxicity in this group,LC50 is 618.146 μg/L.The toxicity of the remaining chemicals against female adult T.truncatus fell between these values,rated as fenpropathrin 65.974 μg/L,cyetpyrafen 93.083 μg/L,fenbutatin oxide 121.919 μg/L,and etoxazole 182.520 μg/L.The study also found different levels of resistance in various species of spider mites to the same acaricides.We recommend rotating the use of abamectin,spirotetramat and etoxazole as conventional acaricides for the control of T.dunchuangensis;For controlling T.truncatus,it is recommended to rotate the use of abamectin,pyridaben and bifenazate as conventional acaricides.
万方数据
维普
