The control of lice (Damalinia ovis) and keds (Melophagus ovinus)—A comparison of the efficiency of common insecticides

Abstract

SummaryAn account is given of comparative trials in which dips containing arsenic, BHC, aldrin, and dieldrin were used. At the minimum concentrations used (0.1 % as As,03, 0.00125% gamma isomer, 0.00125% and 0.00125% resp.) complete kill of lice (Damalinia ovis) was obtained in every case, and, in addition, at least three months protection against reinfection was obtained.Against keds (Melophagus ovinus) all except arsenic were efficient. Jetting with diazinon (0.0025%) and dusting with dieldrin 3% were also completely effective against both parasites.

Louse control in sheep—a comparison of seven dipping preparations

“…In the present trial "Lucijet," "Asuntol," "Nankor," "Delnav," and arsenic did not appear to perform as well as the chlorinated hydro-carbon dips have in the past, but the diazinon-and "Bayer S 1752"-treated sheep showed nearly five months' protection. The protection afforded by these two dips compares quite favourably with that noted by Thomas (1958) for the chlorinated hydro-carbon preparations dieldrin and aldrin. Under conditions simila,r to those of the present trial he found these dips afforded six months' protection from re-infestation.…”

Effect of the sheep body louse (Damalinia ovis) on host weight gain and fleece value

“…Control methods have also received much attention (Thomas 1958;Greenwood 1964;Matthvsse 1967;Heath & Millar 1970), but the economic effect of this parasite remains undefined.…”