Impact of precipitation and aging on the performance of insecticides to control the Japanese beetle Popillia japonica, on grape leaves
Hulbert, Daniel L.
Insecticides are an essential part of pest management, but there are many environmental risks associated with insecticides, especially environment contamination from insecticide runoff after rain. Field-based bioassays determined the effectiveness of the insecticides Imidan an organophosphate, Sevin a carbamate, Capture a pyrethroid, Actara a neonicotinoid, and A vaunt an oxadiazine against Japanese beetles after foliage from concord grapes received 0, 0.5 or 1 inches of simulated rainfall 24 hours and 7 days post field application. Imidan and Sevin generally performed the best of the insecticides tested. Twenty four hours after application, Avaunt did not cause a significant decrease in beetle mortality when 1 inch of rain was simulated. Seven days after application: Imidan did not cause a significant decrease in beetle mortality when 0.5 inches of rain was simulated, Capture did not cause a significant decrease in beetle mortality when 0.5 inches of rain was simulated, Actara did cause a significant decrease in beetle mortality at all 3 simulated rainfall amounts, and Avaunt did not cause a significant decrease in beetle mortality when 0.5 inches of rain was simulated. Significant decreases in an insecticide's performance from 24 hours to 7 days occurred for Capture when 0 and 1 inch of rain was simulated, and Actara when 1 inch of rain was simulated. By using this and other studies, growers should be able to make responsible decisions about how to effectively and responsibly use insecticides to manage insect pests of their crops.
iv, 30 p.
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