Here is a summary of the document in 3 sentences or less:
[SUMMARY]
This dissertation evaluates the acaricidal activity of fractions obtained from the essential oils of lemongrass (Cymbopogon winterianus), rosemary (Rosmarinus officinalis), and cashew (Schinus molle) against the cattle tick Rhipicephalus (Boophilus) microplus. The essential oils were extracted from the plants by steam distillation and then fractionated by vacuum distillation. The compositions of the essential oils and fractions were analyzed by GC-MS, and their acaricidal effects against R. microplus larvae were experimentally determined at different concentrations, finding significant differences between the action of the essential