This study aimed to evaluate the effectiveness of severals concentrations of rope tobacco against the tick (Boophilus microplus) naturally infested on Rolstein dairy cattle. The treatments used were Amitraz at 0.025%; rope tobacco aqueous extract (RT) at 1.25% + neutral detergent at 0.5% (tree aspersions, with interval of 24 hours among them), RT at 1.75% + withewash at 0.5% (tree aspersions); RT at 5.0% + withewash at 2.0% (tree aspersions); RT at 3.75% + neutral detergent at 0.5% (one aspersion) and the control group. Engorged ticks were evaluate with length superior to 4.0 mm, before and at 1st, 2nd, 3rd, 4th, 5th, 6th, 7th and 14th day after treatment. The mean efficacy was 100.0; 77.5; 22.0; 63.8; 25.3 and 0.0%, respectively. Differences (P<0.05) among treatments with chemical product and rope tobacco formulations were observed.
acaricide; Boophilus microplus; Nicotiana tabacum; phytotherapic
