Abstract
ABSTRACT Three sampling techniques including cage-aerosol, sweep net and drop cloth, were compared in their ability to sample insects on snap bean. Few significant differences among the three techniques were detected when used to sample larvae of the corn earworm (CEW), Helicoverpa zea (Boddie), the green cloverworm, Plathypena scabra (Fabricius), or the cabbage looper, Trichoplusia ni (Hubner). The sweep net caught significantly greater numbers of spotted cucumber beetles, Diabrotica undecimpunctata howardi Barber, and tarnished plant bugs, Lygus lineolaris (Palisot de Beauvois). Both are strong fliers and escaped detection with the drop cloth. Although the drop cloth was somewhat faster to use when plants were small, differences in sample time were reduced with larger plants. Throughout the two year study the mean number of CEW larvae per min of sample time was 0.29 with the sweep net and 0.22 with the drop cloth.
Published Version
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