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水稻整个生育期都会发生稻瘟病,特别是苗稻瘟、叶瘟和穗颈稻瘟对后季稻危害最大。病征 (一)苗稻瘟: 多由种子带菌引起,为害秧苗。三叶期前发生,一般不形成明显病斑,多变黄褐色枯死。病斑多数是在三叶期后发生在叶片上,呈短纺锤形、梭形,或是密布不规则的,
Rice blast occurred during the whole growth period of rice, especially rice blast, leaf blast and panicle blast had the greatest damage to the latter season rice. Symptoms (a) seedling blast: mostly caused by seed carriers, damage seedlings. Before the occurrence of the trefoil, the general does not form a significant lesion, changeable brown dead. Most of the lesion occurred in the leaves after the three-leaf stage, was short spindle, spindle, or dense irregular,