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Show DDT TREATMENT CONTROLS PESTS Horn flies, stable flies, house flies, mosquitoes and lice greatly reduce the vitality of cattle and lower beef and milk production, Dr. George F. Knowlton, extension entomologist warned today. Up-to-date methods .of applying DDT will effectively control these pests at low cost per animal of advised. In studies made it has been found that cows treated with DDT gained from 42 to 51 pounds, and calves gained from 47 to 70 pounds more per animal than the untreated cows and calves. It was also found that treated cows gave from five to 15 percent more milk than those not treaed. |