Zonate Leaf Spot
· Millet · Sorghum
At first, small lesions appear on the lower leaves of infected plants. Later, these lesions grow and become circular or target-shaped. On the margins of the leaf, the spots are semicircular. As the disease progresses, the spots coalesce and the whole leaf may be blighted. If the infection is severe, these symptoms may also appear on other parts of the plant.
The pathogen survives in the soil for several years. Infected seeds or sclerotia trigger epidemics when optimal conditions exist, as for example warm and wet weather. The pathogen spreads within and between fields by wind and splashing water.
You can apply high levels of nitrogen fertilizer to decrease the incidence of the disease. Nevertheless, you should focus on preventive measures to avoid an infection in the next growing season.
Chemical treatment is in most cases not feasible.
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