Aiming to study the influence of adition of oil to acaricides, a field experiment was conducted in 1994, at Viradouro, SP, using Assist, Triona and Natur'l Óleo, in dosages of 500 mL per 100 liters of water, added to the acaricides: pyridaben (formulations 200 EC and 750 WP) at 75 mL and 20 g; propargite 720 EC at 100 mL; fenbutatine oxide 500 SC at 80 mL; and cyhexatin 500 WP at 50 g. The experimental design used was randomized blocks. The applications were carried out by a gun sprayer. After the preparation of the solution, the pH was determined. The brushing machine and the steroscopic microscope were used to estimate the mite populations. The addition of Natur'l Óleo can affect negatively the efficiency of acaricides in the control of the citrus leprosis mite, as occured with pyridaben 200 EC and 750 WP and cyhexatin 500 WP. Triona and Assist did not affect the efficiency of the acaricides tested. The insaturation level of the acaricide mistures with Natur'l Óleo was measured using the iodine index method indicating that there was incorporation of the acaricide molecules by the insaturated links of the oil; however, this doesn't explain the different behavior of the products in the control of the citrus leprosis mite.
synergism; efficiency; antagonism; adjuvant
