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近年来保定市棉花黄萎病逐年严重,自1993年起发生面积达到几十万亩,占播种面积的一半以上。继棉铃虫害以后成为威胁棉花生产的又一大病害。已经引起了广大农技人员的注意。 棉花黄萎病苗期很少出现,一般从现蕾期开始发病,花铃期发病最盛。保定市棉花黄萎病从6月下旬开始发生,7月中旬至8月中旬为发病盛期。发病后棉株叶子变黄,呈现萎蔫症状。病株率达到5％即为重病田。棉花黄萎病属于真菌病害,病原菌能长
In recent years, cotton wilt in Baoding City has been serious year by year. Since 1993, the area has reached hundreds of thousands of mu, accounting for more than half of the sown area. Following the cotton bollworm later became another major threat to cotton production. Has aroused the attention of the vast number of agricultural technicians. Cotton Verticillium wilt rarely appear in the seedling stage, usually the onset from the budding period, the most flourishing period. Cotton wilt in Baoding began to occur from late June to mid-July to peak in August. Cotton leaves after the onset of yellow, wilting symptoms appear. Plant disease rate of 5% is seriously ill. Verticillium wilt belongs to fungal diseases, pathogenic bacteria can grow