Abstract
Abstract Field trials were conducted to evaluate the relative efficacies of three different methods of insecticide application against cotton insect pests by use of the electrodyn, Ulva micron and conventional knapsack sprayers. Use of the electrodyn resulted in the highest seed cotton yield in 1981, with an increased yield of 534.0 kg/ha over the control. In 1982 there was no significant (P=0.05) difference in the seed cotton yield obtained following use of any of the three sprayers. In 1985 however, insecticide application with the Ulva micron sprayer resulted in the highest seed cotton yield with a 592.0 kg/ha increase over the control. Seed cotton yields from farmers’ plots demonstrated the superiority of the electrodyn over conventional sprayers in controlling cotton pests. Based on the actual practical application of the three methods, it was concluded that the electrodyn is a more promising implement for insecticide spraying by small farmers than ultra low volume and knapsack sprayers.
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