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Persistence of insecticide spray deposits on different surfaces against Prostephanus truncatus (Horn.) and Sitophilus zeamais (Motsch.)

Published online by Cambridge University Press:  19 September 2011

D. P. Giga  and
Jane Canhao
D. P. Giga
Affiliation:
University of Zimbabwe, Department of Crop Science, P. O. Box MP 167, Harare, Zimbabwe
Jane Canhao
Affiliation:
University of Zimbabwe, Department of Crop Science, P. O. Box MP 167, Harare, Zimbabwe
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Abstract

The biological activity of pirimiphos-methyl (20% e.c.) and a chlorpyriphos-methyl/deltamethrin (20/1% e.c.) formulation applied at different concentrations to glass, jute, plywood and mud surfaees against Prostephanus truncatus (Horn) and Sitophilus zeamais (Motsch.), was compared over a period of 18 weeks. The bioassays were conducted at 28°C and 70% r.h., 1, 4, 7, 14 and 18 weeks after treatment. Insect mortality was significantly influenced by the type of surface, the insecticide concentration, the age of the insecticide deposit and the interactions between these factors. P. truncatus was more susceptible to chlorpyriphos-methyl/deltamethrln deposits than S. zeamais. Amongst the different surfaces, glass retained the highest persistence, followed by jute, plywood and mud against P. truncatus. The insecticide deposits on jute were the most effective in controlling S. zeamais.

Résumé

L'activité biologique de pirimiphos-methyl (20% e.c.) et de chlorpyriphos-methyl/deltametrin (20/1% e.c.), appliqués différéntes concentrations sur des surfaces de verre, de jute, de triplex et de plaque boue désédiée contre Prostephanus truncatus (Horn) et Sitophilus zeamais (Motsch) fut comparée sur une période de 18 semaines, à 28°C, humidité relative 70%. Le type de surface, la concentration d'insecticide, l'âge du dépot d'insecticide ainsi que les interactions entre ces facteurs ont une influence significative sur la mortalité des insectes. P. truncatus fut plus susceptible au dépôts de chlorpyriphos-methyl/deltamethrin que S. zeamais. Parmi les différentes surfaces, le verre a démontré la plus grande persistance contre P. truncatus, suivi de la jute, du triplex et de 1 plaque de boue. Les dépots d'insecticides sur la jute furent les plus efficaces pour le contrôle de S. zeamais.

Keywords

P. truncatusS. zeamaispersistencesurface typemortalityP. truncatusS. zeamaispersistancetype de surfacemortalité
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 13 , Issue 6 , December 1992 , pp. 755 - 762
Copyright
Copyright © ICIPE 1992

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