近几年来,在一些地区随着粳稻面积增大,施肥水平提高,小球菌核病已上升为水稻的主要病害之一。稻株受害初期,在近水面的叶鞘上产生黑褐色的小斑点,渐渐向上发展成黑色细条斑,且逐渐扩大,随即侵入内层叶鞘和茎秆,在茎秆上形成线条状病斑。严重时,使茎秆基部变黑,最后受害部位的组织腐朽变红褐色,致使枯死,因而引起千粒重降低,空壳率 In recent years, with the increase of the area of ​​japonica rice and the increase of fertilization level in some areas, Sclerotinia sclerotiorum has risen to one of the major diseases of rice. In the early stage of damage, the small dark brown spots on the leaf sheath near the water surface gradually develop into black sliver spots and gradually expand, then invade the inner sheaths and stalks, forming linear lesions on the stalks. In severe cases, the base of the stalk is blacked, and finally the tissue of the affected area is decayed and turns reddish-brown, resulting in dead, which causes the decrease of 1000-grain weight and the percentage of shell