Environmental Entomology (1984) 13, 355-358

R.J. Jacobs, C.A. Kouskolekas and H.R. Gross Jr. (1984)
Responses of Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) to residues of permethrin and endosulfan
Environmental Entomology 13 (2), 355-358
Abstract: Tomato plants were sprayed to runoff with permethrin (0.112 kg [AI]/ha) or endosulfan (0.560 kg [AI]/ha). At selected days postspray (1 to 21), Heliothis zea (Boddie) eggs were attached to excised leaves of treated and control plants, and exposed to adults of Trichogramma pretiosum (Riley) within 3.8-liter laboratory containers. Permethrin residues caused significantly lower rates of parasitization by, and higher mortality of, T. pretiosum adults than those of the control for 21 days postspray. Conversely, endosulfan residues significantly reduced egg parasitism and increased adult mortality of T. pretiosum only on day 1 postspray, when compared with the control. Of H. zea host eggs parasitized by T. pretiosum on leaves treated with permethrin or endosulfan, no significant differences were noted in either the female-male ratio of progeny or the mean number of parasitoids produced per host egg.
(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:
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa zea	Tomato (Solanum lycopersicum)
Trichogramma pretiosum (parasitoid)	Helicoverpa zea	Tomato (Solanum lycopersicum)