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近几年,笔者在室内镜检时发现,在连作晚稻后期发生稻瘟病的田块中,有相当数量类似穗颈瘟的病穗并不是受稻瘟病菌所感染。而是由其它真菌侵染而引起的,习惯上称之为穗枯症。进一步的调查证明,这种穗枯症可单独发生也常和稻瘟病混发在一起,在田间发生较为普遍,在杂交水稻田中尤为明显。虽然在水稻生长后期这些罹病植株较少成为白穗,对产量的影响也远不及穗颈瘟那么严重,但这些穗枯引起的枝梗及穗颈褐变,可导致稻穗的严重早衰而降低千粒重。不仅影
In recent years, the author found in the laboratory microscopy, even in late late rice blast occurred in the plots, there is a considerable number of panicle disease panicles is not infected by Magnaporthe grisea. But caused by the infection of other fungi, habitually called head blight. Further investigations showed that this disease could occur alone and often mixed with rice blast, and it was more common in the field, especially in hybrid rice fields. Although these diseased plants rarely became white spikes at the late rice stage, the impact on yield was much less severe than panicle blast, but the stem and panicle browning induced by these panicle blight could lead to severe premature aging of the panicle and decrease Thousand grain weight. Not only shadow