Effectiveness of Different Spay Timing Methods for the Control of Lepidopteron Pests in Cotton
helicoverpa armigera, diparopsis castanea, threshold, pest, spraying, predators
Abstract
Background: Application of chemicals for the control of Helicoverpa armigera and Diparopsis castanea is based on egg threshold, while for Erias insulana and E. biplaga larval counts are used. In Zimbabwe the traditional farmer practice involves use of weekly spraying, fortnightly spraying and spraying at first sight of damaged squares. The methods may be less effective, costly, damaging to the environment and labour intensive. Experiments were conducted for three consecutive seasons from 2010/11 season up to 2012/13 season to evaluate the spray timing methods. Spraying at bollworm egg threshold level was the standard. The trial was laid as a randomised complete block design replicated four times at Cotton Research Institute, Dande and Umguza.
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References
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2017-02-05
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