Soybean end-of-cycle diseases: inheritance from crop to crop

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End-of-cycle diseases (CLDs) are transmitted by two fungi: Septoria glycones e cercospora spp., which cause diseases known as brown spot (or septoria) and Cercospora leaf blight or purple seed spot. The name “end of cycle” came about because symptoms are more easily observed at the end of the soybean cycle, but the name can lead to management errors.

Although they are known as DFCs, in favorable years, the symptoms of these diseases can occur very early in the crop, still in the vegetative phase, through inoculum from seeds or crop residues. Another important factor is that, even though symptoms may appear later in the cycle, these fungi can already be found in the tissues of soybean plants in a latent form since the vegetative stage, without causing symptoms, precisely due to the inoculum sources. cited.

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By Caroline Wesp Guterres (UFRGS); Camila Cristina Lage de Andrade, Marisa Dalbosco e Rita de Cássia Madail Santin (Agronomics - Phytosanitary Diagnosis Lab)

Article published in issue 297 of Cultivar Grandes Culturas Magazine