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20 0 4年发生棉花早衰现象的田块主要分布在老棉区。新棉区发生轻或很少发生。最初是从 6月下旬至 7月上中旬零星发生 ,进入 7月下旬至 8月上旬后大面积发生 ,特别是 8月上旬暴雨骤晴后 ,棉花在很短时间内大面积出现叶脉间失绿黄化 ,叶色逐渐变褐、发红 ,叶片变脆 ,皱缩反卷 ,?
The fields where cotton premature decline occurred in 2004 were mainly distributed in the old cotton area. New cotton areas occur lightly or rarely. Initially from late June to July in mid-sporadic, into the late July to early August after a large area, especially in early August after the sudden heavy rain, cotton in a very short period of time between the chlorotic veins green Etiolated, leaf color gradually brown, red, leaves become brittle, wrinkle roll,?