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病害一、香蕉褐缘灰斑病(尾孢菌叶斑病)1.发生特点从蕉株基部老叶向上部逐渐蔓延危害叶片。初期在叶片正、背面产生圆形或短条形淡褐或暗褐色斑,斑外有褪绿圈,逐渐扩展成长条形或椭圆形黄褐色至深褐色斑,后病斑联合成不规则暗褐大斑,中央灰褐色,斑外缘有黄晕。斑表面生稀疏灰色霉状物。2.防治方法 (1)农业防治:加强检疫,防止从病区调运蕉苗;选用抗病
First, the banana brown edge gray spot disease (cercospora leaf spot disease) 1. Occurred from the base of the plantar upper leaves gradually spread to the upper endangered leaves. Early leaves on the front and back produce round or short brown or dark brown spots, spots with a chlorotic ring, and gradually extended to grow bar or oval yellow brown to dark brown spots, combined into an irregular rear dark spots Brown big spot, the central gray-brown, yellow halo outside the spot. Sparse gray surface mildew mildew. 2. Control methods (1) Agricultural prevention and control: Strengthen quarantine to prevent the banana from being transported from the ward; use disease-resistant