近年来,我县出现了几次苹果幼果萼端周围环状失水坏死现象。1991年、1997年最严重的果园病果率高达67％和74％,给果农造成了巨大的经济损失。该病文献中未见记载,为此,我们对发病规律进行了多处实地调查,并查阅了各发病年份的气象资料,初步摸清了该病的发生规律和预防措施,现报告如下。 一、发病症状 发病当天幼果萼端周围的环形纸凹槽出现失水皱缩,一天后褐变坏死,大部分病果脱落, In recent years, my county appeared several times the young fruit calyx ring around the ring water necrosis phenomenon. In 1991, the worst fruit orchard disease rate in 1997 was 67% and 74%, causing huge economic losses to the farmers. There are no records in the disease literature. Therefore, we conducted a number of field surveys on the pathogenesis and reviewed the meteorological data of each year of onset, and found out the regularity and precautionary measures for the disease. The report is as follows. First, the incidence of symptoms On the day of young fruit calyx side of the annular paper groove appeared shrinkage shrinkage, browning necrosis a day later, most of the disease off,