Abstract
Individual releases of 19,000–387,500 Trichogramma adults per acre on up to 48 acres of cotton at College Station, Tex., resulted in parasitism of Heliothis eggs averaging from 33–81%, with some movement of parasites up to 400 ft within 2 days. Subsequent generations of Trichogramma were not produced in the field due to mortality, apparently caused by drift of methyl parathion (ultra-low volume) which killed 75% of the adult Trichogramma at distances of up to one mile downwind from sprayed fields.
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