番茄苗最下边叶片发黄是什么原因?

2025-01-23 17:37:25
推荐回答(3个)
回答1:

如果叶子长了一段时间,叶子黄了是生命现象黄了可以剪掉。下面的西红柿摘了后,即使叶子不黄也应该剪掉。

回答2:

番茄新梢发黄发紫

回答3:

番茄病毒病主要有
花叶型 ,主要发生在植株上部叶片,表面为在叶片上出现黄绿相间或叶色深浅相间的花叶症状,叶色退绿,叶面稍皱,植株矮化。新生叶片偏小、皱缩、明脉,叶色偏淡。
蕨叶型,植株一般明显矮化,上部叶片叶肉组织退化,叶片细长呈线状,节间缩短。花瓣加长增厚。
条纹型,可发生在茎、叶、果上,茎感病初始产生暗绿短条斑,后呈褐色、长短不一的条斑,并逐渐蔓延,严重时引起部分枝条或全株枯死。叶染病形成褐色斑点或云纹状或条状斑。果实染病,果面着色不匀,畸形,病果易脱落。 
丛生型,顶部及叶腋长出的丛生分枝众多,叶片线状,色淡畸形。病株不结果或结果少,所结果坚硬,圆锥形。
卷叶型,叶脉间黄化,叶片卷曲整个植株萎缩,或丛生多不能开花结果。
黄顶型,顶部叶片褪绿或黄化,叶片变小,叶面皱缩,病叶中部突起,边缘卷曲,植株矮小,分枝增多。
发病初期:可用20%盐酸吗啉胍乙酸铜可湿性粉剂500倍液、
浩瀚高科2%氨基寡糖素水剂300倍液
2%宁南霉素水剂 l50~250倍液
5%菌毒清水剂300-500倍液
等杀菌农药剂喷雾,每隔5~7天喷1次,连续喷2~3次。

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