The new synthetic insecticides as dressings tor blowfly strike in sheep

Abstract

1. The more recent literature on the blowfly problem in South Africa is reviewed and the general conclusions regarding control measures discussed. 2. The larvicidal properties of a number of the new synthetic insecticides for mature third stage maggots of Lucilia cuprina, Wied., are investigated for purposes of their use in blowfly dressings. 3. The methods of assessment of larvicidal properties by in vitro and in vivo tests are stated and tabulated for the different insecticides tested. 4. Patch tests upon sheep for the more common organic solvents of the insecticides are described and the results enumerated. 5. Tests of B.H.C. in wettable powder form and as emulsions are conducted upon blowfly strikes artificially produced upon sheep and the results compared. 6. Recommendations for the use of B.H.C. in wettable powder form at a concentration of 0•5 per cent of the gamma isomer are made. 7. The advantage possessed by B.H.C. of killing third stage maggots slowly thus permitting them to leave the wound before death is pointed out.