云南昭通地区苹果黑星病药剂防治技术研究

为了筛选出适宜云南昭通地区防治苹果黑星病的优良杀菌剂，采用田间小区试验方法，进行了6种杀菌剂(组合)的田间药效试验，结果表明，参试的6种杀菌剂(组合)在推荐剂量使用时，对苹果生长发育均无不良影响。且6种药剂对苹果黑星病均具有较好的防治效果，在施药10d后保护效果均在60%以上，其中20%氟唑菌酰羟胺SC和200g/L氟酰羟﹒苯甲唑SC对苹果叶片和果实的保护效果均高于90%，防效显著，生产上可作为首选药剂广泛推广使用。其次是40%苯醚甲环唑SC和40%腈菌唑SC对苹果黑星病的防治效果较理想，对苹果叶片和果实的防治效果在80%以上，可作为防治苹果黑星病的有效药剂与首选药剂交替喷施。

Studies on the chemical control techniques of apple scab in Zhaotong of Yunnan Province

In order to screen out excellent fungicides suitable for controlling apple scab in Zhaotong, Yunnan Province, field efficacy tests of six fungicides (combinations) were conducted by using field plot test method. The results showed that the six fungicides (combinations) tested had no adverse effects on apple growth and development when used at the recommended dosage. In addition, the six chemicals have good control effects on apple scab, and the protective effects are more than 60% after 10 days of application. Among them, the protective effects of pydiflumetofen 20% SC and pydiflumetofen·difenoconazole 200g/L SC on apple leaves and fruits are higher than 90%, with significant control effects. In production, they can be widely used as the first choice of chemicals. Secondly, the control effect of difenoconazole 40% SC and myclobutanil 40% SC on apple scab is ideal, and the control effect on apple leaves and fruits is more than 80%, which can be used as an effective agent to control apple scab and alternate spraying with the preferred agent.