by: Dr. G.F. Kennedy
Every year and generally starting on a warm day in February I get calls from people saying “My sheep are acting strangely. They are stomping their feet and holding their heads down, shaking their heads and running from place to place and occasionally sneezing. Generally it is during the warmer hours of the day.” We have Sheep Nose Bots and the flies are attempting to deposit larvae in the nose of the sheep. Once deposited, they develop in the nasal passages and sinuses and when mature, drop out, burrow in to soil, pupate and later on the fly emerges and the process repeats itself.
The whole process is more of an irritation than an economic threat and is seldom life threatening. Fortunately, the use of ivermectin type wormers are highly effective against all larvae stages. The use of these wormers reduces incidence of the condition which is an annoyance at most.