木瓜在种植2～3年后往往出现花叶病。该病是一种过滤性病毒,由蚜虫传播,潜伏期为15～20天。其病症可在木瓜植株各个部位表现出来。叶发病初期嫩叶叶脉微皱缩,叶片边缘末端向下卷,叶柄基部有点状或条状的水渍斑点。发病中期顶部叶片出现黄色斑点,叶脉缺绿呈透明点。发病后期上层的嫩叶呈透明状,中层叶片 Papaya planted in 2 to 3 years after the mosaic disease often appear. The disease is a filterable virus, transmitted by aphids, with an incubation period of 15-20 days. The disease can be manifested in various parts of papaya plants. Early leaves of young leaves microcrap shrinkage, the blade edge down to the volume, the base of petiole a little bit or strip of water stain spots. Mid-onset yellow leaves appear on the top of the leaves, veins lack of green was transparent point. Late onset of the upper leaves are transparent, middle leaves