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(接上期)六、香蕉黄叶病(香蕉巴拿马病)1.发生特点成株先在下部叶片及假茎的外层叶鞘发黄,从叶片边缘开始,逐渐向主脉、中脉扩展,也有整张叶子发黄的。黄化的叶片迅速凋萎下垂,叶柄在靠近叶鞘处折曲,上部叶片相继变黄、变褐、干枯和倒垂在假茎四周,仅剩顶部内层叶片保持绿色。有的病株假茎叶鞘爆裂,直达心部,裂口处维管束变红、黄或褐色干腐,叶片萎蔫、倒垂,
Banana leaf disease (Banana Panama disease) 1. Occurrence characteristics Adult first in the outer leaves of the lower leaves and pseudostems sheath yellow, starting from the edge of the leaves, and gradually to the main vein, midrib expansion, there are whole Zhang leaves yellow. The yellowed leaves wilted and drooped rapidly. The petioles flexed near the leaf sheath and the upper leaf turned yellow, brown, dry and upside down around the pseudostem, leaving only the top inner leaf to remain green. Some diseased plants false stems and leaves sheath burst, direct to the heart, the gap at the vascular bundle turn red, yellow or brown dry rot, the leaves wilted, fall down,