Mass production of Trichogramma maidis Pint. et Voeg. and its field application against Ostrinia nubilalis Hbn. in Switzerland
1986
Bigler, F. (Swiss Federal Research Station for Agronomy, Zurich (Switzerland))
The egg parasite Trichogramma maidis Pint. et Voeg. ist being mass reared and released against Ostrinia nubilalis Hbn. in corn in Switzerland since 1978. According to the number of generations of the pest, different release strategies have been developed. In the one generation area, three times 50.000 adults per hectare are released, whereas in the two generations area 150.000 adults per hectare are released only once per generation. In order to get a long activity period by adult parasites, different development stages of the parasites are mixed. The average parasitization rate of the eggs of O. nubilalis varied between the years from 75 per cent to 93 per cent and the reduction of plant attack was in the same order of magnitude. Biological control of O. nubilalis with T. maidis is nowadays well established in farmers practise and has become an important tool in integrated control in corn in Switzerland
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