Abstract
Ooencyrtus nezarae females emerging in the laboratory from three major host species were classified into two groups according to their fore-wing length. One group emerged from the eggs of Piezodorus hybneri and Riptortus clavatus, and the other from the eggs of Megacopta punctatissimum. From the discriminant function based on the results from laboratory-reared females, an attempt was made to infer the host species from which females collected in soybean fields had emerged. The validity was evaluated by comparing annual and seasonal changes in the estimated composition with the actual composition of wasps emerging in the fields.
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