Environmental Entomology (1985) 14, 28-31

S.J. Johnson (1985)
Low-level augmentation of Trichogramma pretiosum and naturally occurring Trichogramma spp. parasitism of Heliothis spp. in cotton in Louisiana
Environmental Entomology 14 (1), 28-31
Abstract: Three low-level releases of Trichogramma pretiosum (Riley), two at 12,500 and one at 37,500 per ha, at 7-day intervals, did not increase early season Heliothis spp. egg parasitism over that in untreated fields at Natchitoches, La., in 1978. Peak parasitism levels were 59.3 and 40.6% in control and release fields, respectively, but declined before peak egg deposition. Peak natural levels of Trichogramma spp. parasitism in the first Hehothis spp. egg generation in cotton in 1979 at Bossier City and St. Joseph, La., were 89 and 62%, respectively.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Seth J. Johnson

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
inundative/inoculative release
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa zea	Cotton (Gossypium)
Trichogramma pretiosum (parasitoid)			U.S.A. (mid S)
Trichogramma exiguum (parasitoid)			U.S.A. (mid S)