Efeito acaricida de extratos de Dendranthema grandiflorum sobre carrapatos Rhipicephalus (Boophilus) microplus

Abstract

Currently farmers have many difficulties to control ectoparasites, that cause great losses in the production of meat, milk and leather. The main ectoparasite that cause losses in productivity is Rhipicephalus (Boophilus) microplus, the cattle tick. This parasite has become resistant to a number of commercially available chemical agents, difficulting its control. Thus, find a new forms of control of this mite is a great field of research. O The use of plant extracts appear as promising methodology for this prupose, since they have greater chemical compound variability, facilitating the sensitivity of the parasite front of a these compounds.. In the present work we show the results of aqueous, hydroalcoholic and ethanol extracts from Dendranthema grandiflorum popularly known as Chrysanthemum, on larvae of R. (B.) microplus. The extracts efficacy was evaluated in concentrations of 10, 25 e 50% (m/v). The best result was obtained with hydroalcolic extract in 50% of concentration (m/v), for this solution the acaricide efficiency was up to 93% after 24 hours of immersion.