永新县三湾公社是一个山高水冷,多雾,日照短的山区。近几年来特别是自1969年以来,随着矮秆品种的推广、施肥水平的提高和密植程度的增加,稻瘟病的发生面积和危害程度逐年加重。据1974年三湾大队调查,珍珠矮穗瘟发病率最轻的达20—30％,一般的达50—60％,最重的发病率达90％以上,甚至颗粒无收。贫下中农痛心地说;“看禾苗喜气洋洋,打苞抽穗丰收在望,打起谷来有担数没有重量”。 Yongxin County Sanwan commune is a mountain of water-cooled, foggy, sunshine short mountain. In recent years, especially since 1969, with the promotion of dwarf varieties, the improvement of fertilization level and the increase of the density of close planting, the occurrence area and the degree of harm of blast are increasing year by year. According to a survey conducted by the Sanwan Brigade in 1974, the incidence of pearlbachz was as low as 20-30%, generally 50-60%, and the heaviest incidence was over 90%. Poor middle peasants said sadly; “Looked grafted seedlings beaming, harvest bud harvest in sight, hit the valley to have no weight.”