The Acute Toxicity and Risk Assessment of 7 Insecticides to Coccinella septempunctata and Trichogramma japonicum
To evaluate the acute toxicity and exposure risk of seven insecticides against two natural enemy insects Coccinella septempunctata and Trichogramma japonicun,the acute toxicity and preliminary risk assessment of the seven insecticides to the two natural enemy insects was determined using the residual film method based on field application information.The results showed that the toxicity ranking of each insecticide to the two natural enemy insects was as follows:25% dinotefuran·tolfenpyrad SC＞37.5% pyridaben·clothianidin SC＞18% spinosad·tolfenpyrad SC＞20% thiamethoxam·lufenuron SC＞40% diafenthiuron·spiromesifen SC＞30% bifenazate·fenbutatin oxide SC＞40% flonicamid·spirotetramat SC.The risk assessment results indicated that a risk of 40% flonicamid·spirotetramat SC and a risk of 30% bifenazate·fenbutatin oxide SC to the two natural enemy insects were acceptable.However,a risk of 37.5% pyridaben·clothianidin SC and 25% dinotefuran·tolfenpyrad SC to the two natural enemy insects were unacceptable inside the farmland.Outside of the farmland scenario,the risks were all only acceptable for the predatory natural enemy Coccinella septempunctata.The risk of 18% spinosad·tolfenpyrad SC and the risk of 40% diafenthiuron·spiromesifen SC were unacceptable only for the parasite natural enemy inside the farmland scenarios.Therefore,in the predator and parasitic natural enemy release areas,37.5% pyridaben·thiamethoxam SC and 25% dinotefuran·tolfenpyrad SC should not be used.
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