Seedling Blast: occurs before clover in the way of the seed infection. Disease seedling gray base, the upper brown. If humidity is high, disease would generate a lot of gray and black mildew layer.
Leaf Blast: small, dark green spots appeared on leaves, gradually expanded to fusiform spots. Spots central is gray, brown edges, with pale yellow halo at outside.
Acute type of lesion: on leaves form a nearly round or oval, dark green spots. White spot lesion type: leaves after damaged, will produces small white nearly round spots, does not produce spores.
1. Pathogens overwinter on diseased straw, rice stumps, and diseased grains, and are the primary source of infection in the following year.
2. The prevalence of rice blast is affected by factors such as climate, variety, cultivation, etc. The bacteria will multiply and infect faster at temperatures around 25°C. Rice is more likely to be infected when the average relative humidity is above 90% or even saturated.
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