This study aims to evaluate the outflow uniformity of knapsack mist-blowers, powered by two stroke internal combustion engine for the control of the mosquito vector of dengue (Aedes aegypti) under different operational conditions. The experiment was planned as a completely randomized factorial 2 x 7 with five repetitions being the variation factors two diameters of orifices of the disc dosimeter and seven application angles in relation to the horizontal plan. It was also evaluated the pressure effect on the flow rate through the Pearson tests. The results showed significant association between the factors diameter of the dosimeter and the application angles for the flow rate. The dosimeter disc of diameter 0.42 mm presented greater uniformity between the average flow rate (12.8 to 38.8 mL min-1) for the band of angles used (60º to -60º) with determination coefficient up to 0.9861. It had a higher correlation between the average flow rate and the pressure determined at the point P3 close to the nozzle, with a correlation coefficient of 0.988 for disc A and 0.985 for disc B. The disc of smaller diameter must be used. The operator will have to be guided and trained for the choice of discs and correction of the time of application in the diverse situations of field in the urban area.
Aedes aegypti; chemical control; sprayer
