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ORTHOSIA HIBISCI GUENÉE (LEPIDOPTERA: NOCTUIDAE): INDIGENOUS PARASITOIDS AND THE IMPACT OF EARINUS LIMITARUS (SAY) (HYMENOPTERA: ICHNEUMONIDAE) ON ITS HOST FEEDING ACTIVITY1

  • J.E. Cossentine (a1) and L.B. Jensen (a1)

Abstract

A 3-year survey of apple and cherry orchards in the interior of British Columbia revealed that speckled green fruitworm, Orthosia hibisci, is the dominant fruitworm species in the south of the Okanagan Valley. Larvae of speckled green fruitworm collected from orchards that used no or minimal insecticides experienced 22.5–29.0% parasitism in 1988–1990. Earinus limitarus was responsible for 98.9% of the parasitism in the 3 years. Parasitoids of minor significance included a Meteorus sp. (Hymenoptera: Braconidae) and Compsilura concinnata (Mg.) (Diptera: Tachinidae). Data from laboratory trials indicated that feeding by O. hibisci in the fifth and sixth instars was significantly (P < 0.05) reduced when larvae were parasitized by E. limitarus. Orthosia hibisci in the second through sixth instars in sleeve cages damaged developing apples in the field. Earinus limitarus appears able to reduce O. hibisci numbers for the following year as well as immediate host feeding damage in at least the last two instars.

Un inventaire d’une durée de 3 ans dans des vergers de pommiers et de cerisiers, a l’intérieur des terres de la Colombie-Britannique, a révélé que l’Orthosie verte, Orthosia hibisci, est le principal parasite des fruits dans le sud de la vallée d’Okanagan. De 22,5 à 29,0% des larves de l’Orthosie verte capturées en 1988–1990 dans les vergers non traités (ou peu traités) aux insecticides étaient parasitées. Earinus limitarus s’est avéré le principal parasite (98,9%) au cours des 3 années qu’ont duré l’étude. Parmi les autres parasitoïdes recontrés, il faut mentionner un Meteorus (Hymenoptera : Braconidae) et Compsilura concinnata (Mg.) (Diptera : Tachinidae). Les résultats obtenus en laboratoire ont démontré que les larves de cinquième et sixième stades d’O. hibisci s’alimentaient significativement moins (P < 0,05) lorsqu’elles étaient parasitées par E. limitarus. Des larves d’O. hibisci des stades larvaires 2 à 6 enfermées dans des cages en manchon ont causé des dommages aux pommes en croissance dans les vergers. Earinus limitarus semble capable de réduire le nombre d’O. hibisci de l’année suivante et de limiter les dommages immédiats causés dans les vergers par l’alimentation des hôtes au cours de leurs deux derniers stades larvaires.

[Traduit par la Rédaction]

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2 Author to whom correspondence and reprint requests should be addressed.

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1

Summerland Research Station Contribution No. 793.

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References

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ORTHOSIA HIBISCI GUENÉE (LEPIDOPTERA: NOCTUIDAE): INDIGENOUS PARASITOIDS AND THE IMPACT OF EARINUS LIMITARUS (SAY) (HYMENOPTERA: ICHNEUMONIDAE) ON ITS HOST FEEDING ACTIVITY1

  • J.E. Cossentine (a1) and L.B. Jensen (a1)

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