Abstract
The egg parasitoid, Trichogramma ostriniae pang & Chen, was released for the control of the Asian corn borer at Waipu, Wufeng and Wujih in central Taiwan for each crop season from fall of 1985 to spring of 1987. Control efficacy through various corn borer control strategies was evaluated over four crop seasons in this study. In summary, releases of T. ostriniae only or integrating parasitoid with insecticide application reduced percent plant injured and gained good control of the Asian corn borer. Parasitism of corn borer egg masses was generally uncorrelated to the abundance of borer egg masses occurred in corn field. Percent parasitisms of egg masses are 43.61~55.6% and 32.33~40.29% over wasp releasing treatments in fall crop 1985 and spring crop 1986, respectively. The increase of releasing number of the wasps raised the parasitism of egg masses up to 70.54~74.20% and 60.79~65.13% over wasp releasing treatments in fall crop 1986 and spring crop 1987, respectively, which revealed the potential of using T. ostriniae in Asian corn borer management system. Percent parasitisms of egg masses for control treatments were not consistently higher than those for insecticide only treatments, which indicated that the use of granular insecticide might not cause any adverse effect on the wasps.
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