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Field Evaluation of Some Chemicals for Efficacy Against Bollworm and Cotton Stainer Species Attacking Cotton in Kenya

Published online by Cambridge University Press:  19 September 2011

A. M. Mambiri  and
B. A. Amadalo
A. M. Mambiri
Affiliation:
Cotton Research Station Kibos, P.O. Box 1490, Kisumu, Kenya
B. A. Amadalo
Affiliation:
Cotton Research Station Kibos, P.O. Box 1490, Kisumu, Kenya
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Abstract

A field evaluation of nine chemicals was conducted at Cotton Research Station Kibos for their efficacy against bollworm and cotton stainer species attacking cotton in Kenya. Based on the yield and percentage stained seed cotton, Decis'Triazophos, pp 321 Karate and Baythroid and Decis were the most effective insecticides in 1985 and 1986 respectively. However, there was no consistency in results of performance of insecticides tested against cotton insects in the 2 years. The apparent poor performance of most insecticides tested against cotton insects was attributed to fixed insecticide spray schedule which resulted in superfluous and often mistimed chemical applications. It is therefore necessary to establish damaging threshold(s) of major cotton pests in this country so that chemicals can be efficiently used to control them with minimum adverse effects on our environment.

Résumé

Une étude aux champs de l'efficacité de 9 pesticides a été effectué à la Station Kibos Cotton Research sur le ver de la capsule et la punaise qui attaquent le coton au Kenya. En se basant sur le rendement et le pourcentage des graines de coton endommagées. Decis'Triazophos, pp 321 Karate et Baythroid et Decis se sont montrés les insecticides les plus efficaces respectivement en 1985 et 1986. Cependant, l'efficacité de ces insecticides testés sur les ravageurs du coton n'était pas le même pour les deux années. La faible efficacité de la plupart des insecticides testés sur les insectes du coton était due au choix d'un calendrier de traitement ayant un interval fixe. Ce programme de traitement a conduit à un gaspillage de produit et surtout à une mauvaise periode de traitement. Il est alors necessaire d'établir les seuils de dégâts des principaux ravageurs du coton dans le pays, pour que les insecticides peuvent être utilisés à bon escient pour la lutte de ces insectes avec un minimum d'effets néfastes à l'environment.

Keywords

Synthetic pyrethroidthresholdresistancecotton stainersDysdercus speciesAfrican cotton bollwormHeliothis armigeraDecisBaythroidpp 321 KaratePyrethrinoïdes de synthèseseuil de dégâtsrésistancepunaise du cotonver de la capsule Heliothis armigeraDecisBaythroidpp 321 Karate
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 2 , April 1988 , pp. 287 - 295
Copyright
Copyright © ICIPE 1988

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References

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