Tecnologia de aplicação aérea de fungicidas na cultura do arroz irrigado

Abstract

This study aimed to evaluate the effect of equipment and application rates, for the control of foliar diseases and pathogens of grains of rice cultivar Puitá CL Inta, with the fungicide azoxystrobin + difenoconazole, and check the density and penetration of drops in the canopy of plants with water sensitive papers. We evaluated the amount of fungicide deposited in the canopy by chromatographic analysis and determined the relationship between the leaf area and the weight of upper and lower layers of the plants. The products were sprayed with Stol deflector nozzle, Travicar hydraulic nozzle and rotative atomizer Turboaero, with volumes between 10 and 30 L.ha-1 . The use of water sensitive papers allowed to verify that higher application rates provided a higher density of droplets in the upper stratum of the canopy of leaves and that all equipment, as well as application rates similar to promote penetration of droplets into the canopy. It follows that to study the distribution of chemicals in the lower and upper layers of the plants via chromatography, can be made with the extraction of plant leaf area portions and not by amounts equivalent weight equal. Even with low disease severity, fungicide application was shown to be important in controlling fungi present in grain post-harvest, such as Fusarium sp. and Gerlachia sp., and the pathogens Bipolaris sp. and Gerlachia sp. at field conditions.