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Poster Presentations


Poster Presentations


Efficacy of fungicide F500 in controlling Asian rust (Phakopsora pachyrhizi Syd.) in soybean

Presenter: Guy Mitsuyuki Tsumanuma(1)

Other authors and affiliations: Antonio Luiz Fancelli(1), Marco Antonio Tavares Rodrigues(2), Edson Begliomini(2), Rafael Bigoto(1), Andre Venturoso Furlanis(1). (1)ESALQ/USP, Crop Production, Piracicaba, Sao Paulo 13418-900, Brazil; (2)BASF-SA, Sao Paulo, Brazil

Today, Asian rust (Phakopsora pachyrhizi Syd.) is the most important disease in soybean culture, causing great productivity losses in this culture, especially when the crop suffers an early attack. This study aimed at evaluating different fungicides for the chemical control of Asian rust in soybean sown off-season. The experimental design was randomized blocks with four replications, having a plot size of 2 10 m. Different groups of fungicides were sprayed to control Asian rust, and sprayings were carried out at three different phenological stages. The treatments were sprayed at V4, R2, and R4 development stages with a CO2-propelled backpack sprayer equipped with twin jet nozzles (Micron 110DB2), 40 lb pol2, and 150 liters ha1 being the spray volume. The severity of the disease was attributed, by the aid of the diagrammatic scale proposed by Canteri & Godoy (2003). The results showed that fungicide spraying at R2 and R4, regardless of the formulation, greatly reduced the severity of the disease. However, it was observed that the fungicide F500 had a longer residual period than the fungicides from the triazole group, therefore slowing the disease development in relation to the treatments in which a fungicide from the triazole group were utilized.

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