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近日,美国环保署紧急豁免德克萨斯州农民使用科麦农公司的三唑类杀菌剂Topguard(粉唑醇,flutriafol)防控棉花烂根病。这是今年美国环保署(EPA)第2次紧急豁免使用此种杀菌剂,应用有效期为2013年2月1日—2013年6月30日。棉花烂根病,也称棉立枯病、黑根病,其症状是苗期受害后,在近地面的茎基部产生黄褐色病斑,后变成黑褐色,并逐渐凹陷腐烂,严重时病部变细,病苗枯死或萎倒。子叶受害后形成不规则形黄褐色病斑,以后病部破烂脱落成穿孔状。成株期受害后,植株枯萎,拔起病株根呈黑
Recently, the U.S. Environmental Protection Agency (EPD) has urgently excused Texas farmers from using Kemalon’s topguard (flutriafol), a triazole fungicide against cotton root rot. This is the second time this year the U.S. Environmental Protection Agency (EPA) has applied for the emergency exemption of this bactericide. The application is valid from February 1, 2013 to June 30, 2013. Cotton root rot disease, also known as cotton blight, black root disease, the symptoms are seedling damage, the base of the ground near the ground to produce brown spots, dark brown, and gradually concave decay, severe disease Ministry thinning, disease withered or wilted. Cotyledons formed irregular yellowish-brown lesion after injury, after the disease broke down into perforation. After the adult plant was damaged, the plants withered and the root of the plant was black