EFFECTS OF SOME INSECTICIDES ON INFESTATIONS OF THE SHORT-NOSED CATTLE LOUSE

Publisher Website
Google Scholar
Abstract
Commercially available pesticides were tested for the control of the short-nosed cattle louse, H. eurysternus. A single treatment with 0.5 per cent dieldrin or malathion at a rate of 2 gallons per head at a pressure of 400 pounds was effective. Chlordane, lindane, and toxaphene applied at the same rate were effective with two treatments at 16-day intervals. DDT was the least effective under these conditions.No significant difference in effect on louse populations was observed between sprays of suspensions prepared from wettable powders and emulsions prepared from emulsible concentrates of lindane, Co-Ral, Korlan, and malathionThree treatments of Trolene administered orally at rates of 100 mg./kg. at 75 mg./kg. at intervals of 11 and 9 days were effective against louse infestations. Trolene at 10 mg./kg./day and 5 mg./kg./day fed to cows for 22 days reduced the louse populations but did not provide complete controlA louse population index, consisting of the total number of lice at 52 sites, each of 2 square centimeters in size, on the animal s body is described.

This publication has 1 reference indexed in Scilit: