Chemosterilization of Adult Horn Flies1

Abstract
Apholate, tepa, and an aziridinyl benzoquinone compound [2,5-bis(l-azirldinyl)-3,6-bis (2-methoxyethoxy)-p-benzoquinone] induced sterility in adult male and female horn flies, Haematobia irritans (L.), when applied topically or mixed with the diet. Topically, 0.1 [mu]g/fly of the aziridinyl benzoquinone compound and 0.5 [mu]g/fly of apholate effectively sterilized the flies. A diet containing 0.05% tepa or 0.01% apholate produced complete sterility when it was given to adult males and females as a single overnight feeding. Horn flies fed continously on a diet containing 5 ppm of tepa were completely sterilized. Mating tests indicated that male horn flies sterilized with tepa were not so competitive as untreated males.

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