@article{Despins_Hunter, III_Davey_George_1995, title={Microencapsulated permethrin sprays for control of southern cattle tick, Boophilus micro plus (Canestrini) (Acari: Ixodidae), infesting Holstein dairy heifers on Saint Croix, U.S. Virgin Islands}, volume={79}, url={https://revistas.upr.edu/index.php/jaupr/article/view/4304}, DOI={10.46429/jaupr.v79i3-4.4304}, abstractNote={<p>The effectiveness of two acaricides was evaluated for control of populations of the southern cattle tick, <em>Boophilus microplus</em> on dairy cattle in St. Croix, U.S. Virgin Islands. Two different concentrations of a microencapsulated (ME) formulation of permethrin (0.05% and 0.10% ai) and one concentration of coumaphos emulsifiable concentrate (EC) (0.117% ai) were sprayed on Holstein heifers that had a natural infestation of ticks. The length of residual activity of EC coumaphos and ME permethrin at 0.05% (ai) was at least four days, and for ME permethrin at 0.10% ai at least seven days.There was no apparent increase in the residual activity period of ME permethrin in comparison to that in field trials of other formulations of permethrin against <em>B. microplus</em>. Percentage control for the three treatment groups from days 4 through 21 was ME permethrin (0.05% ai) 96%; ME permethrin (0.10% ai), 97%; coumaphos, 98.3%. There were no significant differences among the treatment groups (F = 2.21, df = 2,17, P> 0.10). This research confirms the usefulness of permethrin as an alternative to coumaphos for control of <em>B. microplus</em> populations on cattle.</p>}, number={3-4}, journal={The Journal of Agriculture of the University of Puerto Rico}, author={Despins, Joseph L. and Hunter, III, James S. and Davey, Ronald B. and George, John E.}, year={1995}, month={Oct.}, pages={93–98} }