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本文研究了黄瓜霜霉病发病与体内糖的成份的关系。经三年测定,黄瓜任何品种均以自上向下数第5～6节位卷须汁液可溶性固形物含量稳定。顶端高于基部;下午高于上午;灌水前高于灌水后;晴天高于阴天;采瓜前高于采瓜后。以可溶性固形物含量测定值在4以下为感病指标,可用于测定黄瓜品种对霜霉病的抗性及预测预报。 在黄瓜发病前,喷1％糖溶液可降低病情指数,防效80.3～89.5％,其中红糖>蔗糖>葡萄糖。应用1％糖溶液混1％尿素液,每隔10天喷1次,可控制病害发生。
This article studies the relationship between the onset of cucumber downy mildew and the composition of sugar in the body. After three years of determination, all varieties of cucumber are top-down number 5 to 6 of the tendril juice soluble solids content stable. The top is higher than the base; the afternoon is higher than the morning; the height before irrigation is higher than that after irrigation; the sunny is higher than the cloudy day; Soluble solids content of less than 4 in the determination of susceptibility indicators can be used to determine cucumber varieties of downy mildew resistance and forecast. Before the onset of cucumber, spray 1% sugar solution can reduce the disease index, control effect 80.3 ~ 89.5%, of which brown sugar> sucrose> glucose. Application of 1% sugar solution mixed with 1% urea solution, spraying every 10 days, can control the disease.