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Rice blast caused by fungus Pyricularia oryzae, is generally considered the most important disease of rice worldwide because of its extensive distribution and destructiveness under favourable conditions. Rice blast can affect most of the rice plant with the exception of the roots. The fungus can infect plants at any growth stage.
Symptoms can be either lesions or spots. Their shape, colour and size vary depending on varietal resistance, environmental conditions and the age of the lesions. The pathogen infects and produces lesions on the following parts of the rice plant: leaf (leaf blast), leaf collar (collar blast), culm, culm nodes, panicle neck node (neck rot) and panicle (panicle blast). Rice blast is the most important disease of rice worldwide. Under favourable conditions, the disease can results in total crop failure.