Field-collected Agonum muelleri (Herbst) adults were videotaped to assess their ability to climb soybean ( Glycine max (L.) Merr. (Fabaceae)) plants. All individuals climbed up and down soybean plants multiple times. Agonum muelleri spent from 12.5 ± 3.4% to 54.1 ± 11.3% of their time on soybean plants. Caged A. muelleri adults on plants infested with soybean aphids, Aphis glycine s Matsumura (Hemiptera: Aphididae), reduced the number of apterous adults. The presence of predators had an indirect effect on the density of nymphal aphids by reducing the numbers of adult aphids. Agonum muelleri , an abundant carabid in soybean fields, readily climbs soybean plants to feed on soybean aphids.
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Hannam et al. (2008) studied this question.
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