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In general, minute pirate bugs are known as natural enemies of small insects and mites; while some species feed on specific prey (Anderson, 1962a, b), others are known to be polyphagous (Barber, 1936, and others). It goes without saying that in order to evaluate a predatory insect’s role as a natural enemy, it is necessary to clearly identify the prey (Thompson, 1951); however, in the case of polyphagous predators it is essential to consider not only the preference as food of each prey species as emphasized by Anderson (1962b), but also the behavior and population density of each prey species. We have discovered that the predation of aphids by species of the genus Orius, which are found in large numbers in soybean fields in the Tohoku (Northeast) region, is influenced by the behavior and population density of 2 or 3 other prey species that appear concurrently with the aphids. The results of the study are reported here.

Influence of the Predation of Orius sp. (Hemiptera: Anthocoridae) on the Aphid Population in a Soy-Bean Field