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The quality of Trichogramma brassicae Bezd. (=T. maidis n. sp.) (Hymenoptera: Trichogrammatidae) produced in 1998 and 1999 by four companies (AMW Nuetzlinge GmbH, Biocare GmbH, BASF, and Landi) to control the European corn borer Ostrinia nubilalis Hübner (Lepidoptera: Pyralidae) was measured. Standard methods developed by the International Organization for Biological Control (IOBC) were used to assess...
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