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THE SUBLETHAL EFFECTS OF SELECTED INSECTICIDES ON LIFE TABLE PARAMETERS OF PANONYCHUS CITRI (ACARI: TETRANYCHIDAE)

Published online by Cambridge University Press:  31 May 2012

Vincent P. Jones  and
Michael P. Parrella
Vincent P. Jones
Affiliation:
Department of Entomology, University of California, Riverside 92521
Michael P. Parrella
Affiliation:
Department of Entomology, University of California, Riverside 92521
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Abstract

Populations of the citrus red mite, Panonychus citri (McGregor), reared on “rough lemon” seedlings (Citrus limon (L.) Burm.) in a greenhouse and treated with malathion or permethrin were significantly higher than those on untreated seedlings. Significant increases were demonstrated in age-specific fecundity (mx), mortality corrected mx (lx mx), and net reproductive rate (Ro) values for mites reared in the laboratory on leaves treated with malathion or permethrin when compared with those reared on untreated leaves. Mites reared on oxamyl-treated leaves exhibited significant reductions in age-specific survivorship (% lx), mx, lxmx, and Ro values compared with those reared on untreated leaves. The importance of reproductive stimulation in relation to other causes of pest resurgence is discussed.

Résumé

Des populations de la mite Panonychus citri maintenues sur des plantules de citronnier “rough lemon” (Citrus limon (L.) Burm.) en serres et traitées au malathion ou à la perméthrine, se sont avérées plus nombreuses que celles maintenues sur des plantules non traitées. Des différences significatives ont pu être mises en évidence quant à la fécondité spécifique de l'âge (mx), la fécondité corrigée pour la mortalité (lxmx) et le taux net de reproduction (Ro), entre des mites maintenues au laboratoire sur du feuillage traité au malathion ou à la perméthrine, et des mites maintenues sur du feuillage non-traité. Des mites maintenues sur du feuillage traité à l'oxamyle ont montré des réductions significatives de la survie spécifique de l'âge (% lx), et des valeurs de mx, lxmx et Ro, par rapport à celles maintenues sur du feuillage non traité. L'importance d'une stimulation de la reproduction, en regard des autres causes de résurgence des nuisibles, est commentée dans la discussion.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 7 , July 1984 , pp. 1033 - 1040
Copyright
Copyright © Entomological Society of Canada 1984

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