Production and Performance of Trichogramma1 Reared on Eggs of Heliothis zea2 and Other Hosts 3 , 4

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Abstract
A technique for mass-rearing Trichogramma spp. on Heliothis zea (Boddie) eggs is described. A comparison was made of the fecundity and longevity of Trichogramma reared for 3 generations on Anagasta (= Ephestia) kuehniella (Zeller) and Sitotroga cerealella (Oliver). Those reared on A. kuehniella had a much higher fecundity (147.9 vs. 9.9) and longevity (19.9 vs. 4.5) than those from S. cereallela. Field releases were made on cotton, soybeans, and corn to determine the efficiency of T. pretiosum Riley reared on H. zea. Releases of 25,000–60,000/acre resulted in parasitization rates in the range of 30–75% during the initial 24-h period subsequent to release. The results indicate that T. pretiosum reared on H. zea perform better in the field than published reports on the efficiency of those reared on S. cerealella.

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