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EFFECTS OF PYRETHROID INSECTICIDES ON EGGS AND LARVAE OF RESISTANT AND SUSCEPTIBLE POPULATIONS OF SPOTTED TENTIFORM LEAFMINER

Published online by Cambridge University Press:  31 May 2012

D.B. Marshall  and
D.J. Pree
D.B. Marshall
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
D.J. Pree
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

Resistance to pyrethroid insecticides, identified previously in adults of Phyllonorycter blancardella (Fabr.), was shown to extend to both egg and larval stages. Eggs of both resistant and susceptible strains were more susceptible than larvae to various pyrethroid insecticides. Eggs treated 0–2 days post oviposition were more susceptible than 4- to 6-day-old eggs and/or larvae for both strains. Older larvae, especially from resistant strains, were less susceptible than early instars. For eggs and 1st-instar larvae, differences between resistant and susceptible strains were largely overcome by treatment with higher concentrations of permethrin. In the field, low levels of resistance were overcome by applications of permethrin at 212.5 g AI/ha diluted in 3370 L water/ha timed for first hatch of eggs.

Résumé

Il s’avère que la résistance aux pyréthrinoïdes, déjà mise en évidence chez les adultes de Phyllonorycter blancardella (Fabr.), s’étend aux oeufs et aux larves. Les oeufs, des lignées résistantes et sensibles, résistaient moins que les larves à ces différents insecticides. Les oeufs traités 0 à 2 jours après la ponte étaient plus vulnérables que les oeufs âgés de 4 à 6 jours ou que les larves des deux types de lignées. Les larves plus âgées, en particulier des lignées résistantes, étaient moins vulnérables que les larves plus jeunes. Dans le cas des oeufs et des larves de premier stade, la différence entre les lignées résistantes et les lignées sensibles a été largement surmontée par l’application de perméthrine à plus forte concentration. Sur le terrain, on a eu raison du peu de résistance en appliquant de la perméthrine (212,5 g IA/ha dans 3370 L d’eau/ha) à temps pour la première éclosion d’oeufs.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 11 , November 1986 , pp. 1123 - 1130
Copyright
Copyright © Entomological Society of Canada 1986

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