A b stract Experiments in resistant and susceptible sorghum genotypes during the post-rainy season from 1986 to 19X8 at ICRISAT. India showed that foliar applications o f cypcrmethrin applied by 'Electrodyn' sprayer were significantly superior lo high-voiume and low-volume sprays. Effective control o f shoot fly and higher grain yields were obtained when the spray was initiated 6 days after crop emergence. The lowest dosage of cypcrmethrin (22.5 g a.i. ha-gave shoot fly control and grain yield increases similar to those of the higher dosages (33.75 and 45 g a.i. ha-l). Chcmical control o f shoot % had the greatest effect on shoo! fly infestation and increases in grain yields in susceptible genotype CSH 1. followed by the local M35-1 and resistant ICSV 707. Cypcrmethrin applied by Electrodyn was significantly superior to the recommended practice of carbofuran soil application and high-volumc spray ofendosulfan in reducing shoot fly damage in all the three genotypes. The main effect o f cypcrmethrin foliar application was in the reduction o f .shoot fly oviposition that resulted in less damage, indicating either an oviposition deterrent elTcct or death o f the adults before oviposition. K e y w o rd s Shoot fly; cypermethrin; 'Electrodyn' sprayer; A th e rig o n a s o c c a ta \ chemical control; oviposition deterrent; sorghum ; application m ethods
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