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Efficiency of Aldrin and Dieldrin in the Field Control of Natural Blowfly Strike in Sheep¹

Research Branch, Canadian Department of Agriculture, Ottawa, Ontario

Abstract

In a series of field trials no cases of fly strike occurred in lambs previously jetted over the dock and breech regions with 0.5% and 0.3% solutions of aldrin or dieldrin during the years 1954, 1955 and 1956 at the Central Experimental Farm, Ottawa. The number infested in the control groups was markedly reduced as compared to previous years, probably due to the gravid female flies contacting treated individuals and being killed prior to completing egg laying. All lambs in all groups had previously been sprayed with DDT to control external parasites. The treatment is a simple, cheap, and effective method of preventing blowfly strike in sheep and lambs in the area tested.

¹ Aldrin and dieldrin contributed by shell oil Company of Canada,Limited ,Chemical Division.

² Assistance in gathering the data and applying treatments was given by R. H. Holt, J. Arcand, and J. Cavanagh, members of the filed staff, sheep section, Central Experimental Farm, Ottawa.