Abstract
A gasoline-powered trencher was used to sample eggs of the northern ( Diabrotica barberi Smith and Lawrence) and western ( D. virgifera virgifera LeConte) corn rootworms in corn and other crop fields. Rootworm eggs were washed from 1 to 2 liters of soil per trench. Power law equations are given for the relationship between variance and the mean for each crop. Six to seven trenches (each 35 cm deep) per field, with 2 liters of soil washed per trench, are recommended for most applications, which will take about 2.4 h including washing and counting.
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