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稻秆瘟是由稻瘟病菌(Pyricularia cryzae cav)侵染稻秆而产生的一种稻秆受害状.稻秆受侵初期出现褐色斑,以后扩展为校形状斑,严重时几个病斑愈合在一起,使稻秆死亡.湿度大时,病斑表面有灰色霉状物.剖开病秆,内有白色菌丝.稻秆瘟主要是在喷洒赤霉素的杂交水稻制种田中发生.喷洒赤霉素的次数愈多,稻秆瘟的发生就愈重.不同亲本的感病程度不一样,珍汕97A感病,恢复系30选次之,桂33、桂34抗病性则较强.
Rice stalk blast is a rice stalk damage caused by the inoculation of rice straw by Pyricularia cryzae cav.The brown streak appeared in the early stage of rice stalk invasion and later extended to the school shape spot, Together, so that the death of rice stems.When the humidity is high, the lesion surface gray mildew.The cut stalk, there are white mycelium.Dry rice stalk blast is mainly in the hybrid rice system of gibberellin production farming occurred. The more times the gibberellin was sprayed, the heavier the rice blast was. The susceptibility of different parents was different, and the susceptibility of Zhenshan 97A and the restorer were 30, Gui 33 and Gui 34 were significantly lower Strong.