Title: EFFECTS OF PYRETHROID INSECTICIDES ALONE AND IN MIXTURES ON BEMISIA ARGENTIFOLII (HOMOPTERA: ALEYRODIDAE) AND COTTON, CAULIFLOWER, AND BROCCOLI YIELDS
Chu, Chang Chi
Natwick, Eric - UNIV CA EXT, HOLTVILLE
Lee, Richard - USEPA, WASHINGTON, DC
Submitted to: Journal of the Agricultural Association of China
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 1, 1998
Publication Date: N/A
Interpretive Summary: Silverleaf whiteflies are economic pests that have a wide range of hosts. A stop gap control measure is urgently needed before a long term solution is developed. We have conducted chemical studies since 1991 for whitefly control on a variety of crops. Results showed that applying a mixture of two chemicals with different mode of action was better than either one applied alone. The mixtures we found to be more effective to control whiteflies were fenpropathrin plus accephate, tralomethrin plus endosulfan, or fenpropathrin plus endosulfan for cotton; and bifenthrin plus endosulfan for broccoli and cauliflowers.
Silverleaf whitefly (SLW), Bemisia argentifolii Bellows & Perring control on cotton, broccoli and cauliflower was more effective when a pyrethroid insecticide was mixed with an organophosphate or a cyclodiene compound as compared to either material used alone. The effect appears to be additive toxicity of pyrethroid and a second compound with a different mode of action. Cotton lint and cauliflower yields were increased and broccoli matured earlier in pyrethroid-phosphate or pyrethroid-cyclodiene mixture treated plots as compared to plots treated with the individual chemicals alone.