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191问答库 > 玉米粗缩病的危害特征是什么？

玉米粗缩病的危害特征是什么？

谢谢

2025-03-16 08:23:47

推荐回答（1个）

回答1：

玉米整个生育期都可感病,玉米苗4叶前易感病,5~6叶时显现病症,发病开始时在幼叶中脉两侧的细脉间出现透明的褪绿虚线小点,以后透明小点增多,逐渐在叶片背面沿叶脉形成蜡泪状突起& #40;脉突& #41;。
病苗叶色浓绿,叶片僵直,宽短而厚。病苗生长迟缓,植株严重矮化,心叶不能正常展开。至9~10叶植株矮化明显,基部茎节常膨大,上部节间短缩、粗肿,顶部叶片簇生,病株为正常玉米株高的1/3~2/3,根系少而短。
感病植株多数雌穗不能结实,雄穗不能抽出,个别雄穗虽能抽出,但分枝少,无花粉。果穗畸形,花丝少,多不结实。
供参考

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