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Toxicity of some insecticides to the grasshopper Zonocerus variegatus (Orthoptera: Pyrgomorphidae)

Published online by Cambridge University Press:  19 September 2011

Julius I. Olaifa
Julius I. Olaifa
Affiliation:
Department of Plant Science, University of Ife, Ile-Ife, Nigeria
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Abstract

Twenty-one insecticides were tested for acute toxicity by surface film contact method against the grasshopper, Zonocerus variegatus (L.) in the laboratory. Decamethrin, cypermethrin, lindane o, o-diethyl(p-methyl sulfinyl) p′-phosphorothioate, and dieldrin were highly potent. Moderately potent insecticides were propoxur, bioallethrin, telodrin, isodrin, heptachlor and rotenone. A toxic symptom common to all potent insecticides in the female was the opening and closing of ovipositor valves which remained wide open at death. Five insecticides—dieldrin, telodrin, p, p′-DDT, chlorobenzilate, DMC and chlordimeform induced cannibalism among the treated females.

Résumé

Parmi les vingt-et-un insecticides examinés pom la toxicité intense par la methóde contact de la bande de la surface sur la santerelle Zonocerus variegatus (L.) an laboratoire, decamethrin, cypermethrin, lindane, o, o-diethyl (p-methyl sulfinyl) p′-phosphorothioate, et dieldrin étaient fort efficaces. Propoxur, bioallethrin, telodrin, isodrin, heptachlor et rotenone étaient efficaces avec modération. Un symptôme toxique commu a tous les insecticides efficases chez la femelle était l'ouverture et al fermeture des tubes de l'oviposteur qui restaient sovent grandes ouvertes à la mort. Cing insecticides, dieldrin, telodrin, p, p′-DDT, chlorobenzilate, DME, et chlordimeform ont prevequé du cannibalisme chez les femelles traitées.

Keywords

Zonocerus variegatusgrasshopperpotentovipositorLC50cannibalismZonocerus variegatusla sautevelleefficaceavipositeurLC50cannibalisme
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 2 , April 1986 , pp. 135 - 138
Copyright
Copyright © ICIPE 1986

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