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EFFICACY OF SELECTED INSECTICIDES AGAINST LIRIOMYZA TRIFOLII (BURGESS) (DIPTERA: AGROMYZIDAE), A LEAFMINER OF CHRYSANTHEMUM1

Published online by Cambridge University Press:  31 May 2012

Robert F. Smith
Robert F. Smith
Affiliation:
Agriculture Canada Research Station, Kentville, Nova Scotia, Canada B4N lJ5
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Abstract

Cyromazine was effective in controlling Liriomyza trifolii (Burgess) (Diptera: Agromyzidae) larvae within chrysanthemum leaves. Ovipositor puncturing was not deterred by this larvicide. Adult emergence was inhibited when 3rd-instar larvae were exposed to cyromazine. Reduced dosages of 0.003, 0.030, and 0.300 g AI/L did not inhibit initiation of mines, but at the highest rate caused significant mortality. Diflubenzuron reduced L. trifolii ovipositor punctures but did not cause larval mortality. Methomyl applied at 0.5 mL/L gave significant control of larvae. Neither larvicide proved phytotoxic to a range of cultivars tested in a commercial greenhouse. Aldicarb applied to the soil at rates ranging from 28.8 to 575.0 g AI/100 m2 was found effective against L. trifolii larvae but severe phytotoxicity resulted from single applications at the two highest rates. Ovipositor punctures were not reduced as treatment rates increased, but oviposition tended to diminish in response to dosage. Complete leafminer control from a single application would require a highly phytotoxic dosage.

Résumé

La cyromazine s’est avérée efficace pour la répression des larves de Liriomyza trifolii (Burgess) (Diptera : Agromyzidae) minant le feuillage du chrysanthème. Ce larvicide n’a pas empêché le piquage des feuilles résultant de la ponte. L’émergence des adultes a été empêchée par exposition des larves du 3ième stade à la cyromazine. Des doses réduites de 0,003, 0,030 et 0,300 g IA/L n’ont pas empêché l’initiation des mines, mais la dose la plus haute a provoqué une mortalité élevée. Le diflubenzuron a réduit le piquage par ovipositeur mais n’a pas causé de mortalité larvaire. Le méthomyl à 0.5 mL/L a permis une répression efficace des larves. Aucun larvicide ne s’est avéré phytotoxique pour une gamme de cultivars testés dans une serre commerciale. L’aldicarb appliqué au sol à des doses allant de 28,8 à 575,0 g IA/100 m2 s’est montré efficace contre les larves de L. trifolii, mais très phytotoxique en application simple aux deux doses les plus élevées. Le piquage des feuilles par ovipositeur n’a pas diminué avec l’augmentation du dosage, mais la ponte a semblé diminuer avec la dose. La répression complète de la mineuse par application simple exigerait une dose hautement phytotoxique.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 8 , August 1986 , pp. 761 - 766
Copyright
Copyright © Entomological Society of Canada 1986

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