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EFFECTS OF BENZOYLPHENYLUREA INSECT GROWTH REGULATORS ON EGGS AND LARVAE OF THE SPOTTED TENTIFORM LEAFMINER PHYLLONORYCTER BLANCARDELLA (FABR.) (LEPIDOPTERA: GRACILLARIIDAE)

Published online by Cambridge University Press:  31 May 2012

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

Three benzoylphenylurea insecticides, diflubenzuron, triflumuron, and teflubenzuron, were toxic when applied to eggs of Phyllonorycter blancardella (Fabr.) 0–2 and 4–6 days post-oviposition. Most treated eggs hatched but larvae died in the early instars. High larval mortalities also occurred when treatments were applied to foliage prior to oviposition. Treatments applied to larvae, especially older larvae, were less toxic than those applied to eggs. In the field, control was similar whether insecticides were applied during egg deposition, first hatch of eggs, or against early-instar larvae. Applications during egg deposition are suggested as optimal for control. Control of spotted tentiform leafminer with insect growth regulators was equivalent to that obtained with deltamethrin or methomyl.

Residues of diflubenzuron and triflumuron, applied pre-bloom, persisted until leaf drop 19 weeks later. Residues of teflubenzuron persisted for 9 weeks. Populations of spotted tentiform leafminer were suppressed throughout the season and residues of all insect growth regulators except teflubenzuron applied in May were toxic to larvae into October.

Résumé

Trois insecticides benzoylphénylurée, le diflubenzuron, le triflumuron et le téflubenzuron, ont exercé un effet toxique sur des oeufs de Phyllonorycter blancardella (Fabr.) lorsqu’ils ont été appliqués 0–2 et 4–6 jours après l’oviposition. La plupart des oeufs ont éclos, mais les larves ont péri au début du stade larvaire. Les mortalités larvaires ont aussi été très nombreuses lorsque les insecticides ont été appliqués au feuillage avant l’oviposition. Les traitements appliqués contre les larves, en particulier les plus âgées, ont été moins toxiques que ceux qui ont engagé des oeufs. Sur le terrain, le degré de lutte a été le même que les insecticides aient été répandus durant la ponte, la première éclosion des oeufs ou contre les très jeunes larves. Les résultats laissent croire que le meilleur moment d’application serait la période de ponte. Le degré de destruction de la mineuse marbrée par des régulateurs de croissance d’insectes a été équivalent à celui que produit la deltaméthrine ou le méthomyl.

Les résidus de diflubenzuron et de triflumuron, appliqués en pré-floraison, persistent jusqu’à la chute des feuilles, 19 semaines plus tard. Les résidus de téflubenzuron persistent pendant 9 semaines. Les populations de mineuse marbrée ont été supprimées pendant toute la campagne, et les résidus de tous les régulateurs de croissance d’insectes, abstraction faite du téflubenzuron appliqué en mai, étaient toxiques pour les larves en octobre.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 1 , January 1988 , pp. 49 - 62
Copyright
Copyright © Entomological Society of Canada 1988

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