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FIELD RELEASES OF TRICHOGRAMMA MINUTUM (HYMENOPTERA: TRICHOGRAMMATIDAE) FOR SUPPRESSION OF EPIDEMIC SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE), EGG POPULATIONS IN MAINE1

Published online by Cambridge University Press:  31 May 2012

Mark W. Houseweart ,
Daniel T. Jennings  and
Robert K. Lawrence
Mark W. Houseweart
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono 04469
Daniel T. Jennings
Affiliation:
Northeastern Forest Experiment Station, University of Maine at Orono 04469
Robert K. Lawrence
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono 04469
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Abstract

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Trichogramma minutum Riley was released in the field for suppression of epidemic spruce budworm, Choristoneura fumiferana (Clemens), egg populations in Maine from 1977 to 1981. Commercially reared California-strain T. minutum were released from the ground at single-point sources in 1977. In 1978, using 4-point-source releases, we found that the native Maine-strain performed better than the California strain. In 1979, broadcast and multiple releases from the ground gave slight improvement in parasitism over 4-point releases. In 1981, three closely timed, aerially broadcast releases from a helicopter yielded increases in parasitism rates significantly higher than those in control plots, but not sufficient to suppress epidemic spruce budworm populations. Important variables and suggestions for future aerial releases are discussed.

Résumé

Trichogramma minutum Riley a été ralâché sur le terrain afin d'éliminer des populations épidémiques d'oeufs de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clemens) au Maine entre 1977 et 1981. Une souche californienne du T. minutum élevée commercialement a été relâchée à partir de sources comportant un seul point de libération en 1977. En 1978, la souche indigène du Maine a montré une meilleure performance que la souche californienne d'après des lâchers effectués à partir de sources comportant 4 points de libération. En 1979, des lâchers au sol effectués à partir de sources à multiples points de libération ou répétés à plusieurs reprises, ont donné lieu à un parasitisme légèrement plus élevé qu'obtenu avec des lâchers en 4 points. En 1981, trots dispersions effectuées par hélicoptère ont donné des augmentations significatives des taux de parasitisme par rapport aux parcelles témoins, mais non suffisantes pour supprimer les populations épidémiques de tordeuse. La discussion porte sur les variables importantes et sur des suggestions pour des lâchers éventuels.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 10 , October 1984 , pp. 1357 - 1366
Copyright
Copyright © Entomological Society of Canada 1984

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