<div><br></div><div><section class="_135editor" data-role="paragraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">&nbsp; &nbsp; 棉花黄萎病在田间的发病高峰出现在花铃期，主要症状有３种：①黄斑型。叶片出现黄色斑块，严重时呈掌状黄条斑，叶肉枯焦，叶脉保持绿色，呈西瓜皮状，叶缘向上翻卷，严重时叶片大量脱落，全株萎蔫。②叶枯型。叶片局部枯斑或掌状枯斑，叶片枯死后脱落，但一般不形成光秆。③落叶型。典型症状为叶片萎垂，迅速脱落，植株枯死前即成光秆，是致病力最强的一种类型。另外削秆检查，茎内维管束有黄褐色条纹。</span></p></section><section class="_135editor" data-role="paragraph" id="autoparagraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, &quot;Microsoft YaHei&quot;, sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section></div>