一、水稻恶苗病俗称公稻子。是一种世界性病害,严重时,可造成5—50%的损失。病菌主要由种子带菌传播,发病适温为32—35℃。 1、病状及发病期:秧田期,受害株2—4叶以后表现出病状,植株茎叶黄绿细长,比正常苗高1/3以上,根条发育不良,播到本田后多数枯死。本田期,从分蘖开始显现出症状。病株高而纤细,叶片淡黄绿色,节间加长,在茎基部节上有倒生的不定须根,分蘖根少或不分蘖,到孕穗期多数枯死,少数病株能抽出白穗。 2、防治技术:①选抗病品种,在无病田选留种子。②用多效灵(新名恶苗净)30%可湿性粉剂进行种子消毒,每袋100克对水50公斤,可浸种40公斤左右,常温下浸5—7天,浸后不用清水洗,可直接催芽播种,防稻 First, the rice stum disease commonly known as rice. It is a worldwide disease that can cause 5-50% loss in severe cases. Bacteria mainly by the carrier-borne bacteria, the incidence of appropriate temperature 32-35 ℃. 1, the symptoms and the period of onset: Seedling stage, affected 2-4 leaves later showed symptoms, plant stems yellowish green slender, more than 1/3 higher than normal seedlings, root streak dysplasia, most died after sowing Honda. Honda period, from tillering began to show symptoms. The diseased plants are tall and slender, the leaves are yellowish green, and the internodes are lengthened. There are inverted adventitious roots on the basal stems of the stems, little or no tillers at the basal stems, most of them are dead at the booting stage, and a small number of diseased plants can extract the white spikes. 2, prevention and treatment technology: ① election disease-resistant varieties, in the absence of disease-free field to retain seeds. ② with more effective spirit (the new name of the seedlings net) 30% wettable powder for seed disinfection, 100 grams per bag of water 50 kg, soaking about 40 kg, 5-7 days soak at room temperature, after immersion without water washing, Direct germination sowing, anti-rice