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22

Aerial application of tebuconazole + benzimidazole with rotary atomizer for soybean rust control

Presenter: U. R. Antuniassi

All authors and affiliations: U. R. ANTUNIASSI (1), M. A. Oliveira (1), R. B. Oliveira (1), E. D. Velini (1), R. S. Boiani (1), F. V. Siqueri (2). (1) FCA/UNESP, Botucatu, SP, Brazil; (2) Fundação MT, Rondonópolis, MT, Brazil

Application techniques for Asian soybean rust control must offer high performance on spray penetration and leaf coverage because of soybean dense canopy. Rust control was found to be more efficient with preventative applications with fine and very fine droplets. However, this technology is prone to drift, reducing the time available for spraying, so there is a large demand for application systems with high operational performance to provide good timing for the control. The aim of this study was to evaluate the performance of different aerial applications for soybean rust control under field working conditions. Soybean rust control was made by applying the mixture of Orius 250 EC + Bendazol (tebuconazole + benzimidazole) at a dose of 0.4 + 0.5 pc liter/ha. The experiment was designed with six plots applied (one application for each treatment), with four subplots (repetitions) to evaluate each applied area, resulting in 24 subplots for evaluation of treated areas. The applications was made with an EMB 202 Ipanema airplane, using the following systems: atomizer Micronar AU 5000 applied at 10 and 20 liter/ha and atomizer Stol ARD at 30 liter/ha, both with and without the oil addition. Rust severity and fungicide deposits were evaluated. The results showed that the deposits at the lower part of the canopy were around 5% of the total spray recovery, with 20–30% on the medium part and 60–80% on the upper part. Those levels of deposits were enough to provide a similar level of control across the canopy for all treatments.

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