Effect of methoprene on the development of Carposina sasakii mature larvae
This study was aim to develop a new technology for the control of Carposina sasakii.The mature larvae of C.sasakii,which exited from the fruits in response to short-or long-light stimulation,were treated with methoprene by the drip method and sandblast method.The results showed that the proportion of cocooning abnormalities,including non-cocooning,abnormal cocooning,and long cocoon,was approximately 30％.Moreover,the proportion of cocooning abnormalities did not increase with the increase in methoprene concentration.Only 12.5％of the larvae with compressed cocoons were able to emerge from diapause in the 1 mg/L sandblast group,while none of the larvae were able to emerge in the treatment with higher methoprene concentration.The proportion of abnormal cocooning in the mature larvae of C.sasakii under long-light treatment by drip method was 25％approximately.The phenotypes of abnormal cocooning were irregular,and the development in pupae was significantly affected.Many of the insects tested initially had normal cocooning,but subsequently died in the cocoons.The mortality rate increased with the increase in methoprene concentration,with a mortality rate of 100％ovserved at concentrations above 50 mg/L.In the sandblast treatment,the eclosion rates of C.sasakii larvae in the 1 mg/L and 10 mg/L sandblast groups were 40％and 10％,respectively.The higher concentration groups died in the long cocoons without eclosion.Methoprene is environmentally friendly and harmless to humans and animals.This study clarified the developmental disruption effect of methoprene on the subsequent development of mature larvae of C.sasakii,therby providing a valuable reference for future control of C.sasakii.
Carposina sasakiimethopreneinterfere with developmentchemical control
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