Efficacy of doramectin 0.5% w/v Pour-On for control of the horn fly, Haematobia irritans

In 1998, three groups of cattle at three locations in Lousiana were treated with Dectomax(R) (0.5% doramectin) Pour-On and horn fly populations were m onitored. Acceptable levers (less than 50 flies per side) of horn fly contr ol were observed from 4 to 8 weeks. Differences in the length of control am ong the three sites were most likely affected by immigration of adult flies from untreated groups. In 1999, acceptable horn fly control was obtained f or 13 weeks by the use of two treatments of doramectin Pour-On. (C) 2000 El sevier Science B.V. All rights reserved.