穗颈稻瘟是水稻的主要病害之一,高产耐肥杂交水稻普及后,随着插秧密度和施氨水平的提高,更加重了该病的发生流行。1985年该病在勉县大流行,全县1.3万多公顷水稻发病5300多公顷,损失稻谷500万公斤。穗瘟的发生流行除与品种(组合)的抗 Panicle rice blast is one of the major diseases of rice. After the popularization of high-yielding and resistant hybrid rice, the incidence of this disease is more serious with the increase of planting density and ammonia application. In 1985 the disease in Mian County pandemic, the county over 13,000 hectares of rice disease more than 5300 hectares, the loss of 5000000 kilograms of rice. The occurrence of panicle epidemic in addition to the variety (combination) of the anti-