Studies on overwintering, primary infection and control of rice blast fungus, Piricularia oryzae

Kuribayashi, K.

Ann Phytopathol Soc Japan 2: 99-117


Accession: 025564436

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Conidia of P. oryzae on diseased straw and seed, when kept dry at room temp., may live more than 1 year, while the mycelium kept under the same condition may remain viable much longer. Both conidia and mycelium die much sooner under moist conditions. The mycelium which has overwintered produces conidia on the surface of the substratum when moist, and most luxuriously at 18-30° C. Either such conidia or the mycelium within the tissue of diseased spots are the principal means for overwintering of the fungus.