Environmental Entomology (1980) 9, 75-78

Juan D. López Jr. and R.K. Morrison (1980)
Overwintering of Trichogramma pretiosum in Central Texas
Environmental Entomology 9 (1), 75-78
Abstract: In central Texas, Trichogramma pretiosum Riley successfully overwintered within eggs of the tobacco budworm, Heliothis virescens (F.), and the Angoumois grain moth, Sitotroga cerealella (Olivier). All T. pretiosum in host eggs exposed before mid-Nov. produced adults before early Jan. Overwintering individuals developed from host eggs parasitized between mid-Nov. and early Jan. Some overwintering parasites emerged during warm periods in Jan., but few parasites emerged from host eggs exposed in Jan. Most overwintering parasites emerged from early Feb. to mid-Mar. In these 2 hosts, which do not overwinter as eggs, T. pretiosum overwintered in the immature stages at a reduced rate of development. Temperature was probably the primary factor regulating the pattern of development and adult emergence.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sitotroga cerealella		U.S.A. (mid S)
	Heliothis virescens		U.S.A. (mid S)
Trichogramma pretiosum (parasitoid)	Sitotroga cerealella		U.S.A. (mid S)
Trichogramma pretiosum (parasitoid)	Heliothis virescens		U.S.A. (mid S)