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PROGENY PRODUCTION BY TRICHOGRAMMA MINUTUM (HYMENOPTERA: TRICHOGRAMMATIDAE) UTILIZING EGGS OF CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE) AND SITOTROGA CEREALELLA (LEPIDOPTERA: GELECHIIDAE)1

Published online by Cambridge University Press:  31 May 2012

Mark W. Houseweart ,
Daniel T. Jennings ,
Celeste Welty  and
Susan G. Southard
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, U.S. Department of Agriculture, U.S. Forest Service, University of Maine at Orono 0446
Celeste Welty
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono 04469
Susan G. Southard
Affiliation:
Cooperative Forestry Research Unit, College of Forest Resources, University of Maine at Orono 04469
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Abstract

Mean daily progeny production by Trichogramma minutum (“Maine strain”) was 15.2 in Choristoneura fumiferana and 10.9 in Sitotroga cerealella eggs. Total progeny production was higher in S. cerealella, but not significantly different from that of C. fumiferana eggs. Significantly more eggs were deposited by T. minutum the first day than in subsequent days regardless of host. We found no significant relationship between progeny produced by females and the day of male death as previously reported. Ratio of females:males decreased significantly with increasing age and opposition activity of the mother. The oviposition period spanned 68% of the female's life span when S. cerealella eggs were available; whereas females spent significantly less time (60%) ovipositing in C. fumiferana eggs.

Résumé

La production journalière de progénitures chez Trichogramma minutum (“souche du Maine”) a été de 15.2 sur des oeufs de Choristoneura fumiferana et de 10.9 chez ceux de Sitotroga cerealella. La production totale de progénitures était plus élevée chez S. cerealella mais non significativement différente de celle obtenue avec les oeufs de C. fumiferana. Quel que soit l'hôte, un nombre significativement plus élevé d'oeufs ont été produits par T. minutum le premier jour comparé aux jours subséquents. Aucune relation significative n'a été mise en évidence entre la production de progénitures par les femelles et le jour de la mon des mâles tel que rapporté antérieurement. Le ratio femelles : mâles a diminué significativement avec l'augmentation de l'âge et de l'activité de ponte de la mère. La période de ponte s'est étendue sur 68% de la durée de vie de la femelle lorsque des oeufs de S. cerealella étaient offerts, alors que les femelles ont pondu significativement moins longtemps (60%) dans les oeufs de C. fumiferana.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 10 , October 1983 , pp. 1245 - 1252
Copyright
Copyright © Entomological Society of Canada 1983

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