【摘要】 通过对苹果白粉病4～5月份发病情况的田间调查,结果表明:苹果白粉病在4～9月为病害发生期,其中 4～5月气温较低,枝梢组织幼嫩,为白粉病发生盛期,对果树的中后期生长发育影响极大。6～8月发病缓慢或停滞。杀菌剂防治苹果白粉病的田间试验结果表明:4月中旬病害发生初期开始喷药,一般防效可达80％左右。喷药3～4 次,间隔10～15 d左右喷药一次。在使用药剂防治苹果白粉病时,不论是保护性杀菌剂还是治疗性杀菌剂,都应坚持轮换用药的原则。此外,在使用药剂防治该病的同时,还应辅以花期人工摘除,结合冬剪,剪除破芽,压低病原基数等农业技术措施进行防治。更多还原

【Abstract】 The disease situation of apple powdery mildew in April to May is investigated. The result shows that powdery mildew of apple appears at April to September, in which the temperature from April to May was low, the branch and top of the tree is tender, it is the period that powdery mildew mostly occurs, which has great influence on the growth period. From June to August the disease makes slow progress and stagnates. The experiment result of fungicide control indicates that spraying apple trees with fungicide at the middle of April can reach 80% of its control effect. Spraying tress with fungicide three or four times with an interval of 10 to 15 days. No matter what fungicide is used, it should take turns. In addition, using fungicide,the other measures should be used,such as artificial excising at blooming time, combining with winter cutting to drop pathogen amounts,etc.更多还原