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INSECT GROWTH REGULATORS: PROMISING EFFECTS ON CITRUS THRIPS (THYSANOPTERA: THRIPIDAE)

Published online by Cambridge University Press:  31 May 2012

T.G. Grout  and
J.G. Morse
T.G. Grout
Affiliation:
Department of Entomology, University of California, Riverside, California, USA 92521
J.G. Morse
Affiliation:
Department of Entomology, University of California, Riverside, California, USA 92521
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Abstract

Several insect growth regulators (IGRs) were tested against citrus thrips, Scirtothrips citri (Moulton), in Munger cells. In all larval tests, the IGRs worked by preventing the thrips from developing to the pupal or adult stages. After exposing adult females to IGR residues, numbers of emerging progeny were reduced, although these results did not always rank the IGRs in the same order as the larval tests. The most effective IGR tested was UC84572, followed by cyromazine. Avermectin B1, a streptomycete-derived lactone, did not show IGR activity but acted as an insecticide and controlled the thrips at a much lower percentage active ingredient.

Résumé

Nous avons étudié les effets de plusieurs hormones de croissance sur le thrips des agrumes, Scirtothrips citri (Moulton), à l’aide de cellules Munger. Tous les tests effectués sur les stades larvaires ont montré que les hormones empêchent les larves du thrips de se développer jusqu’au stade pupale ou adulte. Après avoir exposé des femelles adultes à des residues d’hormones de croissance, nous avons observé une réduction du nombre d’adultes F1. Ces résultats n’ont pas toujours été du même ordre que ceux des tests effectués sur les stades larvaires. L’hormone la plus efficace fut UC84572, suivit par cyromazine. L’avermectine B1, un dérivé streptomycétique du lactone, a montré aucune activité hormonale, et a plutôt agit comme insecticide, controllant le nombre de thrips avec un pourcentage beaucoup moins élevé d’ingrédient actif.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 4 , April 1986 , pp. 389 - 392
Copyright
Copyright © Entomological Society of Canada 1986

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