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Comparative Evaluation of the Efficacy of Aqueous Neem Extract and Dipel 2x on Diamondback Moth, Plutella xylostella Linn., on Cabbage in Kenya

Published online by Cambridge University Press:  19 September 2011

S. Okoth ,
C. K. P. Ogol ,
M. Basimike  and
M. Varela
S. Okoth*
Affiliation:
Kenya Trypanosomiasis Research Institute, P. O. Box 362, Kikuyu, Kenya
C. K. P. Ogol
Affiliation:
Department of Zoology, Kenyatta University, P. O. Box 43844, Nairobi, Kenya
M. Basimike
Affiliation:
Department of Zoology, Kenyatta University, P. O. Box 43844, Nairobi, Kenya
M. Varela
Affiliation:
GTZ IPM Horticulture ICIPE, P. O. Box 30772, Nairobi, Kenya
*
E-mail: ketri@net2000ke.com
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Abstract

The efficacy of neem kernel cake powder water extract (NKCP-WE) and Dipel 2x (Bacillus thuringiensis var. kurstaki) in controlling the diamondback moth (DBM), Plutella xylostella Linn. (Lepidoptera: Yponomeutidae), on cabbage was evaluated in screenhouse experiments. All concentrations of NKCP-WE tested were larvicidal and plants treated with 25 and 50 g/l NKCP-WE retained larvicidal activity for up to 2 weeks after application. The efficacy of 25 and 50 g/1 NKCP-WE and 0.5 g/1 Dipel 2x was compared by observing DBM development on the treated plants and yields of those plants. Dipel 2x-treated plants had less DBM larval infestation than the neem-treated plants but the latter treatment gave better yield. The implications of these observations are discussed.

Résumé

On a compare l'efficacité de l'extrait aqueux de neem kernel (NKCP-WE) au Dipel 2x (Bacillus thuringiensis var. kurstaki), pour lutter contre le papillon de nuit à dos diamant (DBM) Plutella xylostella Linn. (Lepidoptera: Yponomeutidae). Toutes les concentrations de NKCP-WE testées ont exprimé une action larvicide et les plantes traitées avec 25 et 50 g/1 de NKCP-WE ont gardé une activité larvicide pendant les deux semaines suivantes. L'efficacité des traitements à 25 g/1 et 50 g/1 de NKCP-WE et 0.5 g/1 Dipel 2x a été comparé en observant le developpement du DBM sur les plants traites et les rendements de ces plants. Les plants traités au ‘Dipel 2x’ ont hébergé moins de larves que les plants traites au ‘neem’ mais ce dernier a donné un meilleur rendement. Les implications de ces observations sont discutées.

Keywords

neemAzadirachta indicaDipel 2xBacillus thuringiensisdiamondback mothPlutella xylostellacabbageKenyaneemAzadirachta indicaDipel 2xBacillus thuringiensisle papillon de nuit a diamantPlutella xylostellale chouKenya
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 22 , Issue 2 , June 2002 , pp. 139 - 143
Copyright
Copyright © ICIPE 2002

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References

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