1988年首次在城南、会善果园的巨峰葡萄上发现银杏状叶片,当时误认为是除草剂(2,4—D丁脂)所致,尚未引起重视。1989年5月间,在多处发现类似症状,经查对确认是葡萄扇叶病,此病有两种表现症状: 1.叶片不对称,叶脉透明,主脉靠近,叶面粗糙、皱缩,叶缘锯齿伸长,叶缺裂消失,叶小畸形,呈扇子状,很似银杏叶片。 2.枝蔓顶端变形,植株细弱,茎节缩短,有的叶片和枝条簇生,整株生长受到抑制。同时看到:①品种不同,发病程度不同。巨峰系品种发病多,占调查株数(3.2万株)的7.5％。龙眼、无核黑、玫瑰香、粉红太妃等品种发现极少,占调查株数(5700 It was the first time in 1988 that Ginkgo biloba was found on the Kyoho grapes in the south of the city and in the good orchard. At that time, it was mistaken for herbicide (2,4-D buthyl), and no attention was paid to it. May 1989, similar symptoms were found in many places, confirmed by the investigation is grape leaf disease, the disease has two symptoms: 1. Leaf asymmetry, veins transparent, near the main veins, rough surface folds , Leaf edge serrated elongation, disappearance of leaf defects, small leaf deformity, fan-shaped, ginkgo-like leaves. 2 dendrites top deformation, plant thin, shorten the stems, and some leaves and branches clustered, the whole plant growth was inhibited. At the same time see: ① different varieties, different degrees of illness. Kyoho strains are more common, accounting for 7.5% of the surveyed strains (32,000). Longan, non-nuclear black, rose incense, pink toffee and other species found very little, accounting for the number of investigations (5700