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Suppression of bloodfeeding by Ochlerotatus dorsalis and Ochlerotatus melanimon on cattle treated with python ear tags.

Adult mosquitoes were collected by drop traps to compare bloodfeeding rates between cattle treated with 2 Python ear tags (10% zeta-cypermethrin and 20% piperonyl butoxide) per animal and animals that were untreated. Mosquitoes were collected both 2 and 4 wk after application of the ear tags. Bloodfeeding by Ochlerotatus dorsalis was reduced by 79 and 77%, respectively, and bloodfeeding by Ochlerotatus melanimon was reduced by 84 and 81%, respectively, at 2 and 4 wk. Based on chi-square analysis, differences in bloodfeeding rates due to treatment were significant. The effect of the treatment appeared to be repellency, because no mosquito mortality was observed at the time of collection and no mortality was observed among bloodfed mosquitoes that were collected and held for 24 h.