Abstract
Three seasons'' work on louse control in dairy herds in New York are reported. Of the materials tested only 0.25% chlordane gave excellent seasonal control with one application. Lindane and rotenone at 0.03 and 0.125% respectively, when applied twice at an interval of 11 days gave excellent to good seasonal control. Pyrenone at one application was unsatisfactory. In no instances were there any toxic effects from the materials as used nor any ill effects from spraying dairy cows in the barn during winter.

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