When a lepidopteran egg is parasitized the eggs turn black as the parasitoid develops inside. Trichogramma spp. As part of a continuing effort to establish natural enemies of the European corn borer, Ostrinia nubilalis, in the USA, the egg parasitoid, Trichogramma ostriniae Pang et Chen (Hymenoptera: Trichogrammatidae), an important native parasitoid of the Asian corn borer, Ostrinia furnacalis (Guenée) was selected for introduction from China. have been used for control of lepidopteran pests for many years. Trichogramma is an important bio-control agent as they are egg parasitoids, mainly of Lepidopteran eggs. Up to three wasp larvae may develop in each Lepidopteran egg. 9 ). The major advantage of Trichogramma species as biological control agents is their extremely small size; adult egg-parasitoids measure only 0.3 mm in length, making them virtually invisible to the casual observer ( Fig. They can be considered the Drosophila of the parasitoid world, as they have been used for inundative releases and much understanding today comes from experiments with these wasps. Most trichogrammatid species will attack a range of host species. are small wasps that are endoparasites of lepidopteran eggs. Trichogramma spp.

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