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调查了苹果花叶病的田间发病率、病情指数、危害和产量损失 ,并用 3种药剂的 3种浓度进行了最佳药剂、最佳浓度筛选试验。结果表明 :田间花叶病的发病率达 6 2 .6 9% ,病情指数达 18.0 5。发病小区苹果产量为196 18.5 kg/ hm2 ,单果重量平均为 14 8.6 g,劣质果数大于 2 0 % ;防治区单果重量平均为 180 .0 g,产量为2 35 6 5 .4 kg/ hm2 ,劣质果小于 10 %。防治效果以 2 %中科 6号最好 ,其次是 2 %中科 2号和毒克星 ;使用最佳质量浓度为 4 0～ 6 6 .7mg/ L喷雾。
The field incidence, disease index, damage and yield loss of apple mosaic disease were investigated. The optimum concentration and the best concentration of three kinds of drugs were tested. The results showed that the incidence of Mosaic disease was 62.99% and the disease index was 18.0 5. The apple yield in the affected area was 196 18.5 kg / hm2, the average fruit weight was 14 8.6 g and the inferior fruit number was more than 20%. The average weight of single fruit in the control area was 180.0 g and the yield was 2 35 6 5 .4 kg / hm2. Poor fruit is less than 10%. The best control effect was 2% Zhongke No. 6, followed by 2% Zhongke No. 2 and poison nemesis. The best mass concentration was 40 ~ 6 6 .7mg / L spray.