Abstract
Pads containing a visible dye in an oil solution were attached to a neck band, a halter, a tail tag, ear tags, and leg bands to simulate slow-release insecticide devices. The devices were placed on cows held individually in outside pens exposed to a population of 50–200 horn flies, Haematobia irritans (L.). Self grooming and movements to combat the flies caused dye transfer from the devices to limited areas on the cows. Photographs were taken 24 h after the devices were placed on the cows to record the pattern of dye transfer from each device. A slow-release device must be matched to the habits of the target pest so insecticide released by such a device will be applied to preferred feeding or resting sites on the host.
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