水稻遭受二化螟、三化螟、大螟、蝼蛄、白叶枯病等病虫为害时，常常出现枯心苗。区分这些枯心苗对作好测报工作很有必要。1．二化螟造成的枯心苗蚁螟先群集在叶鞘内侧蛀食为害，叶鞘外面出现水渍状黄斑，以后叶鞘枯黄，叶片也渐死，此为枯鞘期。幼虫继续为害，蛀入稻茎，剑叶尖 When rice is affected by pests such as Sesamia inferens, Borer, Sesamia inferens, Scylla serrata and bacterial leaf blight, dry seedlings often appear. Distinguish between these dead-hearted seedlings for a good job reporting is necessary. 1. Stem borer caused by the stem borer moths first clustered insects in the sheath sheath damage, outside the leaf sheath appears water-like macula, later leaves sheath yellow, leaves also die, this is dry period. Larvae continue to damage, moth into the stems of rice, sword tip