水稻生育后期(抽穗至成熟),由于外界不良条件的影响,造成水稻植株提前枯死,空秕率增加,千粒重下降,严重影响产量。 1.症状表现叶色呈棕褐色,叶片初始纵向微卷,然后叶片顶端出现污白色的枯死状态,叶片薄而弯曲,远看一片枯焦。根系生长衰弱,软绵无力,甚至有少数黑根发生。穗形偏小,穗基部结实率很低,粒色呈淡白色,翘头穗增多。 Due to the influence of bad conditions in the late growth period of rice, the rice plants died earlier, the emptying rate increased, the grain weight decreased, seriously affecting the yield. 1. Symptoms of leaf color was brown, the initial vertical leaf slightly curled, and then the tip of the leaves appeared dirty white dead state, the leaves thin and curved, far look at a Kujiao. Root growth weakness, weakness, and even a small number of black roots. Spike is small, spikelet basal fruiting rate is very low, pale color was pale, Alice head spike increased.