近年来,水稻赤枯病在清流、宁化、建宁等县发生较普遍。症状一般在水稻进入分蘖盛期出现,由下向上从叶尖开始发黄,出现红褐斑点,进而叶尖、叶绿枯萎,以至全叶枯死,茎叶、谷粒均生赤斑。后期根系发黑,腐烂发臭,不发新根,生长停滞。受害轻者减产二、三成,重者颗粒无收。经调查研究,初步摸清了水稻赤枯病是土壤条件引起的一种生理病害。其发生原因有三 In recent years, rice red blight in the clear stream, Ninghua, Jianning County occurs more commonly. Symptoms generally appear in the tillering stage of rice entering the tiller from the bottom up yellow, red spots appear, and then the tip of the leaf green withered, and the whole leaves dead, stems and leaves, grains are born erythema. Late root black, rotten smelly, no new roots, growth stagnation. The victims of light output reduction two or three percent, severe cases of crop failure. After investigation, preliminary find out that rice leaf blight is a kind of physiological disease caused by soil conditions. There are three reasons for its occurrence