Abstract
ABSTRACT On tomato, cucumber and bell pepper cultivation, commonly large quantities of plant-protection products are applied, to control pests and diseases, as a way to guarantee better productivity and final product quality. The knowledge of spreading and evaporation time of spray droplets is fundamental to understand the interaction between fungicides and target surface for proper distribution of this fungicide. This study was installed to determine the wetting area and droplet evaporation of sprays containing the fungicide Cabrio Top, with or without adjuvant Nimbus®, deposited on leaves and artificial surfaces (glass slide). A system was used which analyzes images composed of a droplet generator, a stereoscope camera for capturing images and a climatic chamber for controlling temperature and relative air humidity. Droplets of 600 µm in diameter containing spray solution were deposited on leaf surfaces and on glass slide and sequential images were used to quantify the wetting area and the evaporation time. The spray solution and the target surface are determinant for wetness and droplet evaporation after deposition. Evaporation time and surface tension were inversely proportional to the wetting areas. Addition of adjuvant Nimbus® (0.5%, v/v) reduced the surface tension and provided an increase in the wetting surface area, except on tomato leaves which had shown low wetting capacity in both fungicide solutions applied.
Highlights
Evaporação e capacidade de molhamento de caldas fungicida com e sem adjuvantes em folhas de hortaliças
The aim of this study was to determine the wetting area and the evaporation time of droplets containing fungicide Cabrio Top with and without adjuvant Nimbus®, deposited on leaf surfaces of tomato, bell pepper and cucumber crops, in comparison with an artificial surface
Significant interaction between deposition surface and spray solution for wetting area and droplet evaporation time was noticed. This fact indicates that spreading process and droplet evaporation are determined both by physical and chemical properties of the spray solution and by the deposition surface characteristics of the sprayed droplets, discussed by Oliveira et al (2015) in studies with herbicides on weeds
Summary
Evaporação e capacidade de molhamento de caldas fungicida com e sem adjuvantes em folhas de hortaliças. O objetivo desta pesquisa foi determinar a área de molhamento e o tempo de evaporação de gotas contendo o fungicida Cabrio Top sem e com o adjuvante Nimbus® depositadas em superfícies foliares das culturas de tomate, pimentão, pepino e superfície artificial (lâmina de vidro). Gotas de 600 μm de diâmetro contendo as caldas de pulverização foram depositadas nas superfícies foliares e lâmina de vidro e as imagens sequenciais foram usadas para quantificar a área de molhamento e o tempo de evaporação. The aim of this study was to determine the wetting area and the evaporation time of droplets containing fungicide Cabrio Top with and without adjuvant Nimbus®, deposited on leaf surfaces of tomato, bell pepper and cucumber crops, in comparison with an artificial surface (glass slide)
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