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DEVELOPMENT RATES OF TRICHOGRAMMA MINUTUM (HYMENOPTERA: TRICHOGRAMMATIDAE) AND IMPLICATIONS FOR TIMING AUGMENTATIVE RELEASES FOR SUPPRESSION OF EGG POPULATIONS OF CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

Robert K. Lawrence ,
Mark W. Houseweart ,
Daniel T. Jennings ,
Susan G. Southard  and
William A. Halteman
Robert K. Lawrence
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono, Maine 04469
Mark W. Houseweart
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono, Maine 04469
Daniel T. Jennings
Affiliation:
Northeastern Forest Experiment Station, U.S. Forest Service, University of Maine at Orono, Maine 04469
Susan G. Southard
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono, Maine 04469
William A. Halteman
Affiliation:
Department of Mathematics, University of Maine at Orono, Maine 4469
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Abstract

Development rates of the parasitoid, Trichogramma minutum Riley, were studied to provide information required in timing field releases of T. minutum for suppression of egg populations of the spruce budworm, Choristoneura fumiferana (Clemens). Development was observed in eggs of 2 host species, C. fumiferana and Sitotroga cerealella (Olivier), at constant temperatures of 14, 21, and 27 °C. Parasitoid development varied directly with temperature. Parasitoids developed more rapidly in eggs of S. cerealella than in those of C. fumiferana. Parasitoid males developed faster than females in some host-temperature treatments. Development of T. minutum is apparently rapid enough to allow progeny of parasitoids released early in the spruce budworm's oviposition period to mature and be available to oviposit in budworm eggs deposited later in the budworm oviposition period. Potential release strategies are discussed.

Résumé

On a étudié les taux de développement du parasitoide Trichogramma minutum Riley afin d'obtenir l'information requise pour le relâchement au bon moment de T. minutum en vue de la suppression des populations d'oeufs de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clemens). On a suivi le développement dans des oeufs de 2 espèces d'hôtes, C. fumiferana et Sitotroga cerealella (Oliver), aux températures constantes de 14, 21 et 27 °C. Le développement du parasitoide a varié directement en fonction de la température. Les parasitoides se sont développés plus rapidement dans les oeufs de S. cerealella que dans ceux de C. fumiferana. Les parasitoides mâles se sont développés plus rapidement que les femelles à certaines températures. Le développement de T. minutum est apparamment suffisamment rapide pour permettre aux progénitures de parasitoides relâchés tôt au cours de la période de ponte de la tordeuse de maturer pour pondre dans les oeufs de tordeuse déposés plus tard au cours de sa période de ponte. On discute de stratégies possibles de relâchement.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 5 , May 1985 , pp. 557 - 563
Copyright
Copyright © Entomological Society of Canada 1985

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