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水罐子病是紫玫瑰香葡萄的一种非传染性的生理病害,常因此病引起严重落果,減产达20—45%。典型病穗的外部症状是,果粒着色不正、红而不紫,果柄与果粒处产生离层而脫落,病粒易感染白腐病,促使腐烂脫落。其內部病变則是。果肉与果皮很易脫离成水糊状,用手輕捏即有水滴出,糖度降低,酸淡无味,相对水分增多。水罐子病一般从7月下旬至8月上旬逐日增加,8月上旬达最高峰,以后逐漸平稳。发病至落果的时間不一,初发病的为五至七天,发病迟的时間相对縮短,所以在8月上旬发病的果粒落果最多最快。据观察,当温度在摄氏二十五度以上、相对湿度在85%以上,病害就有可能急驟上升。在此溫湿度范围內,发病率又取决于降雨天数及降雨量多少,連續阴雨則能酿成严重病害。如1963年8月1日至5日連續降雨五天,五天降雨量达二百三十六点九毫米,发病率則由原来的2%上升到21%。土壤含
Jug’s disease is a non-contagious physiological disease of purple-grapes, which often causes serious fruit drop and reduces the yield by 20-45%. The typical symptoms of the outer ear symptoms are, fruit color is not correct, red and purple, fruit stalks and fruit at the separation and shedding, susceptible to white rot disease, to promote decay. The internal lesion is. Pulp and peel is easily separated from the water paste, lightly squeezed by hand that is, the drop of sugar, acid light and tasteless, the relative increase in water. Jug’s disease generally increases daily from late July to early August, reaching the peak in early August and gradually stabilizing thereafter. The onset of the fall to the different times, the initial onset of five to seven days, the relative delay in the onset of time, so in early August the incidence of fruit falling most quickly. It is observed that when the temperature is above 25 degrees Celsius and the relative humidity is above 85%, the disease may rise sharply. In this temperature and humidity range, the incidence depends on the number of rainfall days and the amount of rainfall, continuous rainy season can lead to serious diseases. For example, there was a continuous rainfall of five days from August 1 to August 1963, a rainfall of 236.9 millimeters on five days, and an increase of incidence from 2% to 21%. Soil containing