IWSIH'TS and rodents inflict damage to 1 the crops ot' tin United Sta‘e> that cost growers about si,000,000.000 a year, ac cording to Department of Agriculture ex perts. despite tin- existence ot improved and highly ellective insecticides and poi sons. 1 his is a surprising figure and is seem ingly large enough to spur all growers of crop.- to avail themselves of all available met hods oi control. Seie: 11fic research has developed chemicals that arc wonder-work er.-. in their control of insects, including

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