我县自1981年冬实行“双包到户”后,晚稻纹枯病显著加重。1983年10月上旬病情稳定期调查,未用药田平均株发病率已由双包到户前三年的16. 54％上升到89.3％。 晚稻纹枯病加重的主要原因是施肥量大幅度地提高。1983年冬抽查全县72个农户的5个不同品种的72块晚稻,平均每亩施肥量由原生产队时的25—30担增加到47.2 My county since the implementation of the “double-to-home” in the winter of 1981, late rice sheath blight significantly worse. Investigation of stable condition in early October 1983, the average incidence of unused drug field has increased from 16.55% to 89.3% in double-package to three-family households. Late rice sheath blight aggravate the main reason is that the amount of fertilizer increased significantly. In the winter of 1983, 72 late rice varieties from 5 different varieties of 72 farmer households in the county were sampled and the average amount of fertilizer per acre was increased from 25-30 in the original production team to 47.2