An evaluation of the acaricidal properties of aldrin and dieldrin for the control of sheep scab

Abstract

It may be concluded from the experiments conducted which, though on a small scale, nevertheless represent a severe test of the insecticides used, that Dieldrin is an extremely potent and quick-acting acaricide. Against Psoroptes communis avis it is able to control sheep scab with a single dipping at a concentration of 0•03 per cent of the active ingredient. Its acaricidal action at this strength is comparable to that of gamma B.H.C. at 0•02 per cent. Aldrin in wettable powder or emulsion form, at a concentration of 0•05 per cent of the active ingredient must be regarded as not being sufficiently effective to eradicate scab with a single treatment.