首页|Increasing the dose of fungicide in the seed treatment of soybean can reduce root rot caused by two species of Globisporangium
Increasing the dose of fungicide in the seed treatment of soybean can reduce root rot caused by two species of Globisporangium
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NSTL
Elsevier
? 2021 Elsevier LtdIn Brazil, there are some commercial products composed of metalaxyl-M that can be used as seed treatment of soybean. Metalaxyl-M is a fungicide with efficacy against oomycetes, however, the concentrations and recommended doses of commercial products are not very effective. The objective of this study was to investigate the effect of increasing the dose of commercial products composed of metalaxyl-M for controlling root rot of soybean caused by two species of Globisporangium (G. irregulare and G. sporangiiferum var. ultimum) The treatments were arranged in a factorial scheme of 3 fungicides (Apron, Maxim Advanced and Maxim Quattro) x 7 doses (0.000, 0.003, 0.006, 0.012, 0.018, 0.024, 0.030 mg of metalaxyl-M per seed) x 2 soybean cultivars (‘DM57i52’ and ‘NEO530’). Separate experiments were conducted for each species of Globisporangium. There was a significant effect of the doses on the reduction of root rot severity for both soybean cultivars. The response of root rot severity according to the doses followed either logistic or Weibull regression models. The effective concentrations of metalaxyl-M that reduced 50%, 70% and 90% of root rot severity for ‘NEO530’ were higher than ‘DM57i52’ independently of the product applied. Thus, it can be concluded that the increase in fungicide dose compared to what is already used in Brazil, can promote greater levels of control of root rot caused by G. ultimum var. sporangiiferum and G. irregulare in soybean.
NSTL
Elsevier
