Calosoma sayi and Labidura riparia1 Predation on Noctuid Prey in Soybeans and Locomotor Activity 2

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Abstract
Observations of predatory behavior of a carabid beetle, Calosoma sayi Dejean, and the striped earwig, Labidura riparia (Pallas), were carried out in soybean fields and the functional responses of adult females of each species to noctuid prey were studied in laboratory and field experiments. Each C. sayi female consumed ca. 1–3 noctuid pupae each day regardless of numbers available, but consumed more small pupae than large ones. C. sayi preyed upon 0.95±0.23 to 15.20±3.67 Anticarsia gemmatalis Hübner larvae daily when 1–20 hosts were available, respectively. Pupae on the soil surface and in the soybean canopy were attacked without bias. Adult C. sayi were crepuscular in their locomotor activity and their larvae were active only during daylight. L. riparia consumed ca. 2 noctuid pupae/day and were not inhibited by the presence of the silk cocoon covering the pupae of soybean loopers ( Pseudoplusia includens (Walker)). When from 5–100 soybean looper larvae were available daily, L. riparia attacked 4.51±0.96 to 37.93±16.68, respectively.