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1.猝倒病 出土前染病引起烂种所致,出苗后发病,茎基部出现淡褐色水渍状病斑,病斑绕茎一周,易变软,使表皮脱落,病部缢缩,茎呈线状。该病发病迅速,病斑上部未及表现症状便可折倒。 2.立枯病 幼苗出土后发病,茎基部出现椭圆形凹陷病斑。病斑绕茎一周,易缢缩干枯,植株萎蔫或直立死亡,一般不倒伏。 3.枯萎病 幼苗发病,茎基部变黄缢缩,子叶或全株萎蔫。潮湿时茎基部出现水渍状腐烂,受害处纵裂成丝状,表现长出白色或粉红色霉层。 4.沤根 这是因低温潮湿引起的生理病害,地下根呈锈色,易腐烂,不发新根,地上部叶片边缘变黄,易焦枯,幼苗萎蔫易拔起。 5.灰霉病 叶片和茎发病。病斑呈水渍状腐烂,产生大量灰褐色霉层,病斑不规则,有时可见到轮
1. Dumping disease caused by the disease before the disease caused by rotten, the emergence of post-emergence, the base of the stem appears light brown water stain-like spots, spots around the stem a week, easy to soften the epidermis off, the Ministry of contractions, stem was Linear. The rapid onset of the disease, the upper part of the lesion symptoms can be folded down. 2. Blight seedlings disease after emergence, stem base oval-shaped depression spot. Disease spots around the stem a week, easy to shrink dry, plant wilting or upright death, generally do not lodging. 3. Fusarium disease seedling incidence, stem base yellowing shrink, cotyledons or whole plant wilting. When wet, the base of the stem appears water-like decay, and the damage is broken into filaments, showing white or pink moldy layer. 4. 沤 root This is due to low temperature and humidity caused by physiological diseases, underground roots were rusty, perishable, no new roots, leaves the edge of the ground yellow, easy to coke dry, seedling wilting easy to pull up. Botrytis cinerea leaves and stem disease. Lesions were water-stain rot, resulting in a large number of gray-brown moldy, irregular spots, sometimes seen round