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The rice blast disease is caused by the fungus Pyricularia grisea, which, in its sexual state,is known as Magnaporthe grisea. The disease can strike all aerial parts of the plant. Most infections occur on the leaves, causing diamond-shaped lesions with a gray or white center to appear, or on the panicles, which turn white and die before being filled with grain.


P. grisea is highly specific to rice, although certain strains that don't attack rice can harm
weeds in the rice field. Once on a rice plant, the fungus rapidly produces thousands of
spores, which are carried readily through the air, by wind or rain, onto neighboring plants.