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Effect of horticultural oil on oviposition behaviour and egg survival in the obliquebanded leafroller (Lepidoptera: Tortricidae)

  • A.H. Wins-Purdy (a1), C. Whitehouse (a1), G.J.R. Judd (a2) and M.L. Evenden (a3)

Abstract

The effects of the horticultural oil Purespray Green on oviposition behaviour and egg development in the obliquebanded leafroller, Choristoneura rosaceana (Harris), were investigated through dual-choice and no-choice bioassays and topical applications of oil to developing eggs. A residual 2% (v/v) oil spray on wax-paper and apple-leaf substrates significantly reduced both the number of eggs laid and egg survival in no-choice assays; however, this effect diminished 3 days after treatment. In dual-choice assays, females laid significantly fewer eggs on oil-treated apple leaves than on control leaves, but laid equal numbers of eggs on the oil-treated wax paper and the untreated wax-paper controls. Topical application of oil caused significant dose-dependent mortality of both newly laid eggs and eggs just before hatch, and these two egg stages were equally susceptible to the oil. Topical application of 2% oil caused >99% egg mortality. Our data indicate that gravid female C. rosaceana can assess and reject oil-sprayed surfaces and that the oil can kill eggs through both contact toxicity and suffocation. These characteristics suggest that highly purified horticultural oils like Purespray Green could play a role in an integrated pest management program for this important pest species.

Nous avons étudié les effets de l’huile horticole Purespray Green sur le comportement de ponte et le développement des oeufs chez la tordeuse à bandes obliques, Choristoneura rosaceana (Harris), dans des bioessais à deux choix et sans choix et par des traitements topiques à l’huile des oeufs en développement. Dans des bioessais sans choix, un résidu de 2 % (v/v) de vaporisation d’huile sur du papier ciré et des substrats de feuilles de pommiers réduisent significativement tant le nombre d’oeufs pondus que la survie des oeufs; cependant, cet effet diminue 3 jours après le traitement. Dans des essais à deux choix, les femelles pondent significativement moins d’oeufs sur les feuilles de pommiers traitées à l’huile par comparaison aux témoins; cependant, les femelles pondent des nombres égaux d’oeufs sur le papier ciré traité à l’huile et sur le papier ciré témoin non traité. Le traitement topique à l’huile cause une mortalité significative reliée à la dose à la fois chez les oeufs nouvellement pondus et les oeufs juste avant l’éclosion; les deux stades embryonnaires sont également vulnérables à l’huile. Un traitement topique à l’huile à 2 % cause une mortalité des œufs >99 %. Nos données indiquent que les femelles gravides de C. rosaceana peuvent reconnaître et rejeter les surfaces badigeonnées d’huile et que l’huile peut tuer les oeufs à la fois par toxicité de contact et par suffocation. Ces caractéristiques indiquent que les huiles horticoles hautement purifiées, telles que Purespray Green, pourraient jouer un rôle dans un programme de lutte intégrée contre cette espèce importante de ravageur.

[Traduit par la Rédaction]

Copyright

Corresponding author

1Corresponding author (e-mail: Andreas.WinsPurdy@gov.bc.ca).

References

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