菜豆细菌性萎蔫病菌侵染菜豆的最典型的症状是()。 -题库考试答案搜索网

菜豆细菌性萎蔫病菌侵染菜豆的最典型的症状是()。

单选题

2021-09-02 13:24

A、种苗叶片逐渐萎蔫,伴随褪色,植株矮化。
B、茎基部呈暗褐色,表面密生白色丝状菌丝束,后期在菌丝层上结生茶褐色圆形菌核。
C、靠近地面茎基部或蔓部初呈水浸状,后呈灰白色。在潮湿环境下,症茎密生白色棉絮状菌丝体,并结生黑色菌核。
D、叶片上初生暗绿色水浸状斑点,扩大后呈不规则形,变褐色,病组织变薄,半透明,周围有黄色晕环。

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正确答案

A

试题解析

标签：文鼎教育乐山师范学院植物检疫学

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