Abstract
Magnaporthe grisea, (Hebert) Barr [anamorph, Pyricularia grisea Sacc.], is a heterothallic ascomycete fungus (Rossman et al.,1990) capable of causing disease in more than fifty members of the Gramineae (Ou, 1985). These include many forage grasses and weeds, and a number of important crops such as wheat (Triticum aestivum), barley (Hordeum vulgare), millet (Pennisetum americanum),maize (Zea mays) and rice (Oryza sativa). Magnaporthe grisea is most widely known, however, as the causal agent of rice blast, the most devastating disease of cultivated rice. Rice blast is a persistent problem and in the past 20 years has caused average annual losses from 11 to 30% of the world rice harvest (Baker et al., 1997), equivalent to 157 million tons of rice.
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