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番木瓜花叶病于1959年开始在广东各地发生,近年来严重流行。1962—1963年調查省委农場二区、潮阳县东山果园、河南园艺場磨碟砂第三生产队等几个果园的发病率为23.3—96.89％。发病初期,植株頂部叶片背面产生水漬状圈斑,随后全叶呈花叶症状,极少变形,但新长出的叶片有时呈畸形状态。頂部嫩茎及叶柄初期产生水漬状斑点,后逐漸扩大并連合成水漬状条紋。果实上产生水漬状圈斑或同心輪紋圈斑,大小为0.1—3厘米直径,可互相联合成不規則形。冬季天气轉冷,花叶症状不显著,成长树的
Papaya mosaic disease began in 1959 in various parts of Guangdong, in recent years, a serious epidemic. In 1962-1963, the incidence of several orchards was 23.3-96.89% in the Second Farm of Provincial Party Committee, the Dongshan Orchards of Chaoyang County, the Third Production Team of Abrasive Sand Production in Henan Horticultural Field. Early onset, the top of the leaves of plants produce water-like circle circle spots, followed by mosaic leaf mosaic symptoms, very little deformation, but the newly growing leaves sometimes deformity. The top of the tender stems and petioles early water-like spots, and gradually expanded and combined into water-like stripes. Fruits produce water-like circle of circles or concentric circles Circle circle spots, the size of 0.1-3 cm in diameter, can be combined into an irregular shape. Cold weather in winter, mosaic symptoms were not significant, growing trees