一、轮纹病轮纹病主要为害果实和枝干。枝干受害后,以皮孔为中心,形成直径3—20毫米大小不等的圆形或椭圆形病斑,呈褐色至灰褐色,病部中央突起成质地坚硬的疣状物,故又称“疣皮病”。以后病斑边缘发生龟裂,形成一道凹陷的环缝与健皮分离。次年病斑上长出黑色小点状分生孢子器,病组织逐渐翘起并脱落。果实多在成熟期和贮藏期发病。果实受害后,最初在皮孔处生成灰褐色水渍状小斑点,以原皮孔为中心迅速向四周扩大,形成深浅相间的同心轮纹呈淡褐色至红褐色果腐,条件适宜时,5—7天可全果腐烂,并发出酸臭气味,后期 First, the ring rot disease Mainly harmful fruits and stems. Branch of the victim, with lenticels as the center, the formation of 3-20 mm in diameter ranging from round or oval lesions, brown to gray-brown, the Ministry of disease protruding into a solid hard warts, it is also known as “Wart skin disease.” After the lesion edge of the crack occurs, forming a hollow ring seam and healthy skin separation. The following year spots grow black dot conidia, diseased tissue gradually tilt and fall off. More fruit in the maturity and storage of disease. After the fruit was harvested, initially the small spots of gray-brown water stains were formed in the lenticels, rapidly expanding to the periphery around the original lenticels, forming a concentric pattern of light and brown to reddish-brown fruit rot with dark and white phases. When the conditions are favorable, 5- 7 days can be the whole fruit decay, and sour odor, late