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The concentration of lamdacyhalothrin and its effect on the cutworm Agrotis segetum (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  10 July 2009

B.W. Blair
B.W. Blair*
Affiliation:
Tobacco Research Board, Harare, Zimbabwe
*
Dr B.W. Blair, Tobacco Research Board, P.O. Box 1909, Harare, Zimbabwe.
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Abstract

During initial screening of the synthetic pyrethroid lamdacyhalothrin (PP 321) at a concentration of 44 and 22 mg/l and applied as a 30 ml drench over each plant against third to fourth instar cutworms, Agrotis segetum (Denis & Schiffermüller) in microplots, few died but they did not damage the plants. Reducing the concentrations to 11 and 5.5 mg/l increased mortality and plant damage. When A. segetum were confined on soil treated with the insecticide at concentrations of 22, 11 and 5.5 mg/l and sprayed at an equivalent rate of 500 l/ha, they all died within one day. The higher concentrations appeared to have a repellent and/or antifeedant effect, and it has been possible to reduce the concentration of lamdacyhalothrin to 12.5 mg/l (≡5.6g a.i./ha) for the drench treatment without risking economic plant damage. For insecticides that have repellent and/or antifeedant properties, it should be possible to balance lower concentrations with adequate protection of plants from pest damage.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 81 , Issue 2 , June 1991 , pp. 143 - 145
Copyright
Copyright © Cambridge University Press 1991

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