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稻田里经常发生一些症状相似的黄叶、叶斑、青枯、枯心、白穗等,很容易混淆,影响对症施治。但只要经常深入田间观察,仔细比较,抓住症状特异点,是可以区分辨认的。一、几种黄叶 (一) 白叶枯病黄叶一般由下向上蔓延,病叶发黄至枯白色。叶片发病开始多从叶尖、叶缘、也有自叶脉间形成侵染线斑,渐向叶基部发展。识别特征:病部与健部分界明显,常呈波纹状,同时,病斑扩展中,在其前端往往有不明显的呈嫩黄色的细线状条斑(即“先遣斑”)。潮湿或保湿时,病部生有蜜黄色、
Often in the rice fields some symptoms similar to the yellow leaves, leaf spots, withered, dry heart, white spike, etc., it is easy to confuse, affect symptomatic treatment. However, as long as the regular in-depth field observation, careful comparison, to seize the symptoms of specific points can be distinguished. First, several yellow leaves (a) bacterial yellow leaves generally spread from the bottom up, diseased leaves yellow to dead white. Leaf blade onset from the tip, leaf margin, there are also formed from the vein infection line spot, gradually to the leaf base development. Identification of features: Department of disease and the Department of the Ministry of clear boundary, often corrugated, at the same time, the lesion expansion, at its front end is often not obvious was bright yellow fine line-like plaque (ie “advance spot”). Moist or moisturizing, the Ministry of students have honey yellow,