Abstract

GARCES FIALLOS, Felipe Rafael  and  FORCELINI, Carlos Alberto. Relationship Between Incidence and Severity of Asian Soybean Rust Caused by Phakopsora pachyrhizi Sydow & Sydow. Rev. Fac. Nac. Agron. Medellín [online]. 2011, vol.64, n.2, pp.6105-6110. ISSN 0304-2847.

Incidence is related to severity of the Asian soybean rust, where values generated by the equations can be used in any study of this pathosystem, providing a tool to evaluate incidence as well severity. Gradients of the disease were generated by means of the use of fungicides and moments of application, in a preventive and curative way. The field experiment with the cultivar Nidera RG 5909, was distributed in a randomized complete block. The intensity of Asian rust layers was measured in the lower, middle and top of the plant, through various counts of incidence (percentage) and severity (lesions cm-2, uredinia cm-2 and percentage) in leaflets. The regressions showed a significant correlation between incidence and severity at 1% probability. With obtained data, the assessor can choose the most reasonable or reliable quantification method at their discretion for other research or apply a particular disease control, using the linear equations generated, facilitating the work of quantifying Asian soybean rust either seeking to measure the incidence (%) or the number of injuries cm-2, urédias cm-2 or severity (%).

Keywords : Phytometry; agronomic performance; diseases; fungicides.

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