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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和1996两年最严重的园树病果率高达67％和74％。由于该病原先在文献中未见记载,我们连续对大发生的1991年、1996年和轻度发生的1997年的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。 1 发病症状 发病当天幼果萼端周围的环形低凹槽出现失水皱缩,一天后褐变坏死。接着大部分病果脱落,未脱落病果病变部位逐渐干缩凹陷或翘起,
In recent years, there have been several occurrences of ring-like dehydration and necrosis around the calyx side of apple fruit in our county. The most serious fruit tree disease rate was 67% and 74% in 1991 and 1996 respectively. Since the disease was not previously documented in the literature, we conducted a series of field surveys on the incidence patterns of major occurrences in 1991, 1996 and mild occurrences in 1997, and reviewed the meteorological data for each year of onset, initially Find out the law of the disease and preventive measures. An onset of symptoms On the day of young fruit around the calyx end of the ring-shaped low groove shrinkage dehydration, brown necrosis one day later. Then most of the disease fruit off, did not shed the lesion lesions gradually shrink depression or tilt,