Plant Diseases

Brown Spot

(on Rice)

Brown Spot
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Brown spot is caused by a fungus with both an asexual and a sexual stage.

The disease can attack at all crop/plant development stages. The fungus infects the leaves, leaf sheath, panicle branches, and spikelet’s. The disease causes seedling blight, with small, circular, yellow brown or brown lesions that may girdle the sheath of the emerging leaf tip and distort primary and secondary leaves. Typical brown spot symptoms are observed at tilling stage and beyond; small and circular foliar lesions that are initially dark brown to purple-brown. These lesions are circular to oval with a light brown lesions which are often surrounded by a brown or yellow-brown halo, which is a toxin produced by the pathogen.