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Performance of two application systems of pesticides in citrus The aim of the work was to evaluate and compare two application spray systems of pesticides in citrus, aiming the reduction of the application volume rate in based in the amount of product that remains in the target (spray deposition) and distribution of the drops. Actually in the citrus orchard high application volumes rates for the pest control are used increasing the operational costs. The application system must be based in sophisticated technology to reduce the application volumes rates and also be efficient in the pest control. For such we evaluated two pesticides application systems with an air carrier sprayer. The application systems used were the rotary discs atomizers and the hydraulic nozzles, to compare the performance based in the applied volume rates, spray deposition and droplets distribution. A spraying run for each system was performed on a random sample of four trees for each system, water-sensitive papers, leaves and glass slides had been used for data collection. The water-sensitive papers were analyzed with visual imaging software (e-Sprinkle) and the spray deposition was analyzed with gas chromatography and gel permeation chromatography. The application system with rotary discs atomizers used reduced application volumes rates and had less deposit than hydraulic nozzles but did not significantly differents. Those results were important because the application system with rotary discs atomizers only used fifth of the application volume rate compared with hydraulic nozzles, must be consider of vital importance the economical aspect to complementary works.

Avaliação de dois sistemas para aplicação de agrotóxicos em citros