梨顶腐病梨顶腐病一般只发生于西洋梨品种如巴梨、三季梨上，幼果期即开始发病，初在果实萼洼周围出现淡褐色稍浸润的晕环，渐次扩大，颜色加深。严重时，病块可波及果顶的大半部，病部变黑，质地坚硬，中央灰褐色。有时因感染其他杂菌而腐烂，使病部长出黑色或粉红色的霉... Pear top rot Pear top rot generally occurs only in pear varieties such as pear, three pear, the onset of the onset of young fruit, early in the fruit calyx depression appeared slightly brown halo, gradually expanding, darker color . In severe cases, the disease can affect most of the top of the fruit, dark lesions, hard texture, the central gray-brown. Sometimes due to infection with other bacteria and decay, so that the disease grow black or pink mold ...