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AVAILABILITY AND ACCEPTABILITY OF SPRUCE BUDWORM EGGS TO PARASITISM BY THE EGG PARASITOID, TRICHOGRAMMA MINUTUM (HYMENOPTERA: TRICHOGRAMMATIDAE)1

Published online by Cambridge University Press:  31 May 2012

Mark W. Houseweart ,
Susan G. Southard  and
Daniel T. Jennings
Mark W. Houseweart
Affiliation:
University of Maine, Orono, Maine 04469
Susan G. Southard
Affiliation:
University of Maine, Orono, Maine 04469
Daniel T. Jennings
Affiliation:
University of Maine, Orono, Maine 04469
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Abstract

Spruce budworm egg deposition spanned 27 days during both 1979 and 1980. The egg deposition curve is essentially a normal bell-shaped distribution with a slight skew to the right. Spruce budworm eggs are most acceptable to T. minutum Riley for successful parasitism during the earlier stages of host–egg development. Parasitism rates at two different temperatures (21 °C and 27 °C) were significantly greater for 1- to 3-day-old eggs than for 6- to 8-day-old spruce budworm eggs. Major reduction in host–egg acceptability occurred after the fifth day at 21 °C and after the 4th day at 27 °C.

Résumé

La ponte de la tordeuse des bourgeons de l'épinette s'est étendue sur 27 jours en 1979 et en 1980. La courbe décrivant la ponte est une distribution normale en forme de cloche avec une légère asymétrie vers la droite. Le maximum de convenance des oeufs de tordeuse pour le succès du parasitisme par T. minutum se situe dans les premiers stades du développement de l'oeuf. Les pourcentages de parasitisme à 2 températures différentes (21 °C et 27 °C) se sont avérés significativement plus élevés pour des oeufs de 1 à 3 jours que pour des oeufs de 6 à 8 jours. On a observé une importante réduction de l'acceptabilité des oeufs après le 5ième jour à 21 °C et le 4ième jour à 27 °C.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 8 , August 1982 , pp. 657 - 666
Copyright
Copyright © Entomological Society of Canada 1982

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