一、表现症状不同 果树花叶病为病毒病,树叶呈现各种类型的斑驳状。病斑沿叶脉扩展退绿变黄,其余部分仍为绿色。发病轻时,叶片局部散生淡黄色或黄白色大小不等的零星花斑,不形成坏死斑;发病较重时,沿叶脉变色,出现白色或黄白色的坏死斑块,其中以沿叶脉 First, the performance of different symptoms Mosaic disease is a virus disease, leaves showing various types of mottled. Lesions along the veins extend back green turn yellow, the rest is still green. Occurrence of light, the leaves of the local scattered light yellow or yellowish white sporadic size uneven spot, do not form necrotic spots; incidence heavier, along the veins discoloration, white or yellowish white necrosis, which along the veins