Evaluation of Methods for Sampling Predatory Arthropods in Soybeans 1

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Abstract
Sweep-net, plant shake, and vacuum net procedures were evaluated for sampling Orius insidiosus (Say) (Hemiptera: Anthocoridae), Nabis spp., (Hemiptera: Nabidae), Araneida, adult Chrysopa spp. (Neuroptera: Chrysopidae), adult Coccinellidae (Coleoptera), and adult Anthicus cervinus La Ferte-Sénecterè (Coleoptera: Anthicidae) in Iowa soybeans. Absolute-density estimates, taken by whole-plant removal procedures, provided standards for comparison. Plant shaking generally produced the most precise and cost-efficient estimates and is recommended for sampling the majority of predators. Sweep-net sampling was superior in terms of cost and in variability analyses for adult Nabis spp., Chrysopa spp., and Coccinellidae. The vacuum net was least satisfactory and is not recommended. Correlation of relative estimates with absolute population trends varied between years and seemed to be influenced by soybean plant growth factors.

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