几种杀菌剂对白菜霜霉病的防治效果

Effects of Several Fungicides on the Control of Chinese Cabbage Downy Mildew

[目的]为筛选出白菜霜霉病防效最佳药剂及药剂组合。[方法]通过单一和复配施药,调查不同药剂对白菜霜霉病的田间防控效果。[结果]药后7 d单一喷施10%多抗霉素WP 120 g/hm^2、50%氯溴异氰尿酸SP 750 g/hm^2和100 g/L氰霜唑SC 75 g/hm^2对白菜霜霉病的防效均达70.00%以上。10%多抗霉素WP分别与50%氯溴异氰尿酸SP、36%烯酰吗啉WP和100 g/L氰霜唑SC组合施用均能极显著提高对白菜霜霉病防效,其中效果较佳的是10%多抗霉素WP+100 g/L氰霜唑SC组合和10%多抗霉素WP+50%氯溴异氰尿酸SP组合,其药后7、14 d的防效分别达91.29%和88.42%、82.18%和76.19%。[结论]10%多抗霉素WP与100 g/L氰霜唑SC,50%氯溴异氰尿酸SP,36%烯酰吗啉WP组合药剂对防治白菜霜霉病具有增效作用,可用于白菜霜霉病的田间防控。

[Aims] This paper aims to screen out the best reagents and reagents combination for Chinese cabbage downy mildew prevention. [Methods] The field control effects of different agents on downy mildew of Chinese cabbage were investigated by single and compound application. [Results] The results showed that the single application of polyoxin 10% WP 120 g/ha, chlorobromoisocyanurate 50% SP 750 g/ha and cyazofamid 100 g/L SC75 g/ha had the control effect of more than 70.00% on the downy mildew of Chinese cabbage after the application 7 d.The mixture of polyoxin 10% WP+chlorbromoisocyanurate 50% SP, polyoxin 10% WP+dimethomorph 36% WP,polyoxin 10% WP+ cyazofamid 100 g/L SC can significantly improve control effect against cabbage downy mildew, the best effect is polyoxin 10% WP + cyazofamid 100 g/L SC and polyoxin 10% WP + chlorobromoisocyanurate 50% SP combination, the control effect on 7, 14 d after the application was 91.29 and 88.42%, 82.18 and 76.19% respectively.[Conclusions] The combination of polyoxin 10% WP, cyazofamid 100 g/L SC, chlorbromoisocyanurate 50% SP and dimethomorph 36% WP had synergistic effects on the prevention and control of downy mildew in Chinese cabbage, and could be used for field prevention and control of downy mildew in Chinese cabbage.