Killing pests with poison can be expensive and dangerous. A better way to get rid of them is to let some other pest do the job. Last week Drs. Edward A. Steinhaus and Clarence G. Thompson of the University of California told how they have waged successful biological warfare against green caterpillars (Colias philodice eurytheme) that chew up alfalfa.
Wilting Caterpillar. After a few weeks of chewing alfalfa, green caterpillars usually get a virus disease (wilt) that turns their insides to mush. The trouble with this epizootic is that, before the virus gets...
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