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ADVERSE EFFECT OF FENOXYCARB ON REPRODUCTION BY THE CALIFORNIA FIVESPINED IPS, IPS PARACONFUSUS LANIER (COLEOPTERA: SCOLYTIDAE)

Published online by Cambridge University Press:  31 May 2012

N.-M. Chen  and
J.H. Borden
N.-M. Chen
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Bumaby, British Columbia, Canada V5A 1S6
J.H. Borden
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Bumaby, British Columbia, Canada V5A 1S6
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Abstract

The effects of fenoxycarb, ethyl[2-(p-phenoxyphenoxy)-ethyl]carbamate, an insect growth regulator with juvenile hormone activity, on reproduction in Ips paraconfusus Lanier were investigated. Topical treatment of either females or both sexes of parent beetles with 50 μg of fenoxycarb per insect resulted in a significant reduction in hatching of eggs and numbers of progeny produced by beetles allowed to infest logs of ponderosa pine, Pinus ponderosa Laws. When pairs of beetles were allowed to attack logs that were surface-treated with fenoxycarb, the effects on reproduction at a dose of 100 μg/cm2 of bark surface were comparable to those of a topical treatment at a dose of 50 μg per insect. However, at doses of 1000 or 10 000 μg/cm2 the adverse effects included reductions in the length of egg galleries, fecundity (number of egg niches), and number of freshly laid eggs. Percentage reductions in progeny were 35.8, 82.5, and 95.7 for doses of 100, 1000, and 10 000 μg/cm2, respectively, if brood beetles were allowed to emerge from the logs. This study indicates that fenoxycarb acts as an effective chemosterilant on I. paraconfusus.

Résumé

On a étudié les effets du fenoxycarb, éthyl[2-(p-phénoxyphénoxy)éthyl]carbamate, un régulateur de croissance à action juvéno-hormonale, sur la reproduction d’Ips paraconfusus Lanier. L’application topicale du produit à des femelles ou des parents des deux sexes à la dose 50 μg par insecte a réduit significativement l’éclosion des oeufs et le nombre de progénitures des scolytes qu’on a laissés infester librement des bûches de pin ponderosa, Pinus ponderosa Laws. Lorsque des paires de scolytes pouvaient attaquer librement des bûches traitées en surface avec du fenoxycarbe, les effets sur la reproduction à la dose de 100 μg/cm2 de surface d’écorce étaient comparables à ceux de l’application topicale de 50 μg par insecte. Cependant, aux doses de 1000 et 10 000 μg/cm2, on a noté une réduction de la longueur des galeries, de la fécondité (nombre de nids d’oeufs) et de nombre d’oeufs frais pondus, parmi les effets néfastes du traitement. Le pourcentage de baisse de la reproduction était de 35,8, 82,5, et 95,7, aux doses de 100, 1000 et 10 000 μg/cm2, lorsqu’on suivait les nichées jusqu’à l’émergence des bûches. L’étude indique que le fenoxycarbe est un chimiostérilisant efficace contre L. paraconfusus.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 12 , December 1989 , pp. 1059 - 1068
Copyright
Copyright © Entomological Society of Canada 1989

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