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Field evaluation of foliar and soil insecticides for the control of Aphis gossypii Glover (Homoptera: Aphididae) on potatoes in Kenya

Published online by Cambridge University Press:  19 September 2011

J. H. Nderitu  and
J. M. Mueke
J. H. Nderitu
Affiliation:
National Agricultural Laboratories, P.O. Box 14733, Nairobi, Kenya
J. M. Mueke
Affiliation:
National Agricultural Laboratories, P.O. Box 14733, Nairobi, Kenya
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Abstract

Field evaluation showed oxydemeton methyl 25% E.C. at 0.6 kg a.i./ha and dimethoate 40% E.C. at 0.74 kg a.i./ha to be more effective than cypermethrin 40% E.C. at 0.25 kg a.i./ha, decamethrin 2.5% E.C. at 0.03 kg a.i./ha, endosulphan 35% E.C. at 0.8 kg a.i./ha and profenofos 50% E.C. at 0.74 a.i./ha in the control of apterae on potatoes. Disulfoton 10G at 1.6 k0g a.i./ha and carbofuran 10G at 5.2 kg a.i./ha were superior to oxamyl 10G at 5.2 kg a.i./ha and terbufos 5G at 2.6 kg a.i./ha applied in the furrow at planting for the control of aphids. Although these insecticides gave good control of apterae, the alate population in the treated plots varied from significant reduction to no reduction. All the insecticides tested did not significantly increase potato yield, although mean yields were increased.

Résumé

Les expériences entreprises sur le terrain ont montré que l'‘oxydemeton methyl 25% E.C. á 0.6 kg m.a./ha’ et le ‘dimethoate 40% E.C. á 0.74 kg m.a./ha’ sont plus efficaces que le ‘cypermethrin 40% E.C. á 0.25 kg m.a./ha’, ‘decamethrin 2.5% E.C. á 0.03 kg m.a./ha’, ‘endosulphan 35% E.C. á 0.8 kg m.a./ha’ et ‘profenofos 50% E.C. á 0.74kg m.a./ha’ pour la suppression des ‘apterae’ sur les pommes de terre. Le ‘disulfoton 10G á 1.6kg m.a./ha’ et le ‘carbofuran 10G á 5.2kg m.a./ha’ étaient meilleurs que l'‘oxamyl 10G á 5.2kg m.a./ha’ et le ‘terbufos 5G á kg m.a./ha’ dans le sillon au lemps desemence pour la suppression des aphis. Mênce si ces insecticides ont fait une bonne suppression des ‘apterae’, la population ‘alate’ dans les ceins traites a varié d'une réduction significative á une réduction nulle. Aucun de ces insecticides á accru significativement la production des pommes de terre.

Keywords

Apteraealatesfoliar sprayssoil insecticides
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 5 , October 1986 , pp. 667 - 675
Copyright
Copyright © ICIPE 1986

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References

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