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SCREENING FOUR EXOTIC PARASITOIDS AS POTENTIAL CONTROLS FOR THE EASTERN HEMLOCK LOOPER, LAMBDINA FISCELLARIA FISCELLARIA (GUENÉE) (LEPIDOPTERA: GEOMETRIDAE)

  • R.J. West (a1) and M. Kenis (a1)

Abstract

Among the 20 geometrid species recovered from annual surveys in coniferous forests in the Swiss Alps, three species, Epirrita autumnata (Borkhausen), Agriopis aurantiaria Hübner, and Poecilopsis isabellae Harrison, were identified as sources for parasitoids that might be suitable as candidates for introduction to Newfoundland to control the eastern hemlock looper, Lambdina fiscellaria fiscellaria (Guenée). Four univoltine Hymenoptera were identified as candidates: Dusona contumax (Forster) (Ichneumonidae) from A. aurantiaria, Dusona sp. from P. isabellae, Aleiodes cf. gastritor (Thunberg) (Braconidae) from E. autumnata, and Aleiodes. sp. from P. isabellae. The candidate parasitoids were confined with their native hosts in the laboratory and observations made to gather basic biological information and define protocols for screening.

Small numbers of these parasitoids were shipped to Newfoundland and screened in the laboratory against hemlock looper larvae. Although attacks by D. contumax, Dusona sp., and A. cf. gastritor were observed, parasitoid development did not occur. All parasitoid eggs recovered from the hemlock looper larvae attacked were encapsulated. Dusona contumax, Dusona sp. from P. isabellae, A. cf. gastritor, and Aleoides sp. from P. isabellae are not recommended for introduction against the eastern hemlock looper.

Parmi la vingtaine d’espèces de géométrides trouvées lors d’inventaires dans les forêts de conifères dans les Alpes suisses, trois espèces, Epirrita autumnata (Borkhausen), Agriopis aurantiaria Hübner et Poecilopsis isabellae Harrison, ont été sélectionnées comme sources potentielles de parasitoïdes pouvant être introduits à Terre-Neuve pour la lutte contre l’arpenteuse de la pruche, Lambdina fiscellaria fiscellaria (Guenée). Quatre parasitoïdes univoltins ont été sélectionnés : Dusona contumax (Forster) (Ichneumonidae) obtenu de larves d’A. aurantiaria, Dusona sp. de P. isabellae, Aleiodes cf. gastritor (Thunberg) (Braconidae) d’E. autumnata, et Aleiodes sp. de P. isabellae. Les parasitoïdes candidats ont été élevés au laboratoire sur leur hôte d’origine afin d’obtenir des informations sur leur biologie et d’établir des protocoles pour les tests de compatibilité sur l’arpenteuse de la pruche.Un petit nombre de ces parasitoïdes a été envoyé à Terre-Neuve et testé au laboratoire sur des larves de l’arpenteuse de la pruche. Bien que des attaques de D. contumax, Dusona sp. et A. cf. gastritor aient été observées, les parasitoïdes ne se sont pas développés. Tous les oeufs retrouvés dans les chenilles étaient encapsulés. Dusona contumax, Dusona sp., A. cf. gastritor et Aleiodes sp. ne sont pas recommandés comme agents de lutte biologique contre l’arpenteuse de la pruche.

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References

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SCREENING FOUR EXOTIC PARASITOIDS AS POTENTIAL CONTROLS FOR THE EASTERN HEMLOCK LOOPER, LAMBDINA FISCELLARIA FISCELLARIA (GUENÉE) (LEPIDOPTERA: GEOMETRIDAE)

  • R.J. West (a1) and M. Kenis (a1)

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