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Commercial synthetic acaricides have selected resistant populations of  Rhipicephalus microplus , and generate residues in the environment or in milk/cattle products. In this study, aqueous extracts (AE) from  Melia azedarach  (Maz),  Allium sativum ,  Capsicum chinense ,  Nicotiana tabacum  (Nta) and  Dysphania ambrosioides  were evaluated for the bioactivity against the cattle tick. The treatment using Nta or Maz AE resulted in the lowest egg hatching rate (34.0 ± 11% and 25.0 ± 19%), and in the values of reproduction inhibition ranging from 89.0% to 85.3%. Phytochemical screening associated to RP-HPLC/DAD analysis suggested the presence of alkaloids for Nta and gallic acid derivatives and catechins, for Maz. Such results highlighted that the use of Nta and Maz AE can be a promising source of bioactive compounds for the control of infections caused by the cattle tick.

Bioactivity of Meliaceae, Amaryllidaceae, Solanaceae and Amaranthaceae plant aqueous extracts against the cattle tick Rhipicephalus microplus