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炭疽病是红麻生产上为害最严重的病害,红麻整个生育期间,嫩茎、叶、花、朔果等器官都可受害,发病轻的引起减产,重的全部失收。5～6月和8～9月是我区发病高峰。一、病状:当幼苗出土,从子叶开展时,幼茎基部呈淡褐色病斑,组织细缩,折倒杆枯而死。未死幼苗的子叶或叶片感病,出现不规则形,中央褐色,边缘紫红色的水渍病斑湿度时变褐色腐烂,而且可蔓延到生长点呈黑色枯死或烂头;茎部感病呈梭形或长条状凹陷病斑,造成茎折倒;花蕾感病引起发黄早落;塑果为畸形果。二、发病规律:种子带菌是红麻炭疽病病菌远距
Anthracnose is the most harmful disease in the production of kenaf. During the whole growth period of kenaf, the tender stems, leaves, flowers, fruit and other organs can suffer, the incidence of light caused by the reduction of production, heavy all lost. May to June and August to September is the peak incidence in our district. First, the symptoms: When the young seedlings unearthed from the cotyledons when young stem base pale brown lesions, tissue constricted, folding rod dead. Cotyledons or leaves of unripe seedlings were susceptible to the disease with irregular brownish brown spots and watery red stains on the edges, which turned brownish rotten when wet and spread to black spots. Fusiform or strip-like depression lesion, resulting in stems collapsed; flower buds caused by yellowing early fall; plastic fruit is deformed fruit. Second, the incidence of law: seed germ is anthracnose pathogen away