Abstract
The present experiment was conducted to evaluate the acaricidal activities of the aqueous - methanolic extracts of rhizome of Curcuma longa, fruit of Citrullus colocynthis and seed of Peganum harmala. Modified Larval Immersion test (syringe method) was used to evaluate the acaricidal activity of plant extracts in lab against Rhipicephalus microplus. Acaricidal activity of each plant was evaluated at two different exposure times (time-mortality experiment) i.e., 24 h post exposure and 6 day post exposure. The highest activity was recorded at 6th day after application of combined three plants at the dose rate of 50 mg/mL; whereas, lowest acaricidal efficacy was observed at 24 h with the dose rate of 3.125 mg/mL in case of individual effect of P. harmala. The herbal formulation is suitable for the poor farmers as a broad spectrum antiparasitic. The contents of the formulation are cheap and commonly available. The combination of plants may be recommended for use at farm level based on empirical evidence of its anti-parasitic activity. (C) 2015 Friends Science Publishers