The protection of sheep against blowfly strike. II. The influence of the length of wool at the time of treatment on the duration of protection

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Peer-Reviewed Research

Abstract:

The duration of protection afforded to sheep against blowfly strike by the treatment of the wool with an insecticide possessing good powers of diffusion is correlated with the length of wool at the time of treatment. For every additional 1/4 inch in the length of fleece treated by B.H.C. wettable powder at a concentration of 0•5 per cent gamma, full protection is prolonged by 2 ½ weeks and partial protection by 6 weeks.