摘要： 通过离体试验测定烯酰吗啉与百菌清复配对辣椒疫霉菌不同生长发育阶段的毒力发现,在烯酰吗啉与百菌清11个不同复配组合中,最佳配比为1∶11,其对抑制辣椒疫霉菌孢子囊形成、游动孢子萌发和菌丝生长的增效系数分别为1.54,2.37,1.86,均表现为增效作用;以1∶9和11∶1复配时,分别对抑制游动孢子萌发和菌丝生长也表现为增效作用,增效系数分别为1.59,1.50;采用小株喷雾法测定了烯酰吗啉与百菌清的两种复配组合对辣椒疫病的预防效果和持效期。复配比例为11∶1时,10,5,1mg/L3个浓度处理对辣椒疫病的预防效果均显著高于相同浓度单剂处理,并且在用药后第14天时,10mg/L相对防效依旧高达67.50%,用药间隔期可达14d;复配比例为1∶11时,10mg/L处理对辣椒疫病的预防效果显著高于烯酰吗啉相同浓度处理,持效期也延长2～3d;与百菌清相同浓度相比,其预防效果也相对较高。

关键词: 烯酰吗啉, 百菌清, 辣椒疫霉菌, 增效作用, 预防效果

Abstract: The synergistic effects of the mixtures of Dimethomorph with Chlorothalonil were tested against Phytophthora capsici Leonian at different stage,in vitro. The results showed that the mixtures of Dimethomorph with Chlorothalonil at the ratio of 1 to 11,in the 11 mixed preparations,was synergistic in inhibiting the formation of sporangium,the germination of zoospores and mycelium growth,and the synergistic ratios (SR) of the mixtures of the two compounds were respectively 1. 54,2. 37 and 1. 86. The SR of the mixtures at the ratio of 1 to 9,in inhibiting the germination of zoospores,and 11 to 1,in inhibiting the mycelium growth,were respectively 1. 59 and 1. 50. At the same time,the Protective efficacy and the duration of efficacy of Mixtures of Dimethomorph and Chlorothalonil were tested respectively at the best ratios of 1 to 11 and 11 to 1. The Protective efficacy of the mixtures at the ratio of 11 to 1,with the concentrations of 10,5 and 1 mg /L,was obviously stronger than the independent's at the same concentrations. The relative control effect at the concentrations 10 mg /L was still as high as 67. 50% after 14 days.There was also a significant difference between the mixtures at the ratio of 1 to 11 and Dimethomorph with a higher protective efficacy and a longer duration of effectiveness for 2 to 3 days at the concentrations 10 mg /L. Compared with the same concentration of Chlorothalonil,the preventive efficacy was also relatively higher.

Key words: Dimethomorph, Chlorothalonil, Phytophthora capsici, Synergism, Protective efficacy

中图分类号: 

• S482.2