七种杀菌剂对番茄早疫病的防效试验

本试验对番茄早疫病叶上的病原菌进行分离和提纯,鉴定出病叶上的病原菌为茄链格孢Alternaria solani (Ellis et Martin) Sorauer。试验采用了含毒培养基菌丝生长速率法,测定了七种杀菌剂对番茄茄链格孢菌的防效,试验表明：药后48h,世高和施加乐的EC&;amp;lt;sub&;amp;gt;50&;amp;lt;/sub&;amp;gt;值分别为0.27mg/L,0.81mg/L,毒力指数最大,对茄链格孢菌有良好的防治作用效果；唑菌胺酯和克菌星的防效良好,EC&;amp;lt;sub&;amp;gt;50&;amp;lt;/sub&;amp;gt;值为1.29mg/L,1.54mg/L；扑海因和敌力脱也有较高的防效,EC&;amp;lt;sub&;amp;gt;50&;amp;lt;/sub&;amp;gt;值为2.07mg/L,2.79mg/L；大生防效较低,EC&;amp;lt;sub&;amp;gt;50&;amp;lt;/sub&;amp;gt;值为5.17mg/L。药后72h,各药剂对番茄茄链格孢菌的防效与48h相似。

Control Effect of 7 Fungicides to Tomato Early Blight

The paper aims to determine the control effect of 7 fungicides on tomato early blight and screening the best fungicide for it. The experiment was conducted to isolate and purify the pathogen on tomato diseased leaves, and the pathogen was identified as Alternaria solanil. The growth rate method was used to determine the control effect of 7 fungicides on Alternaria. The results showed that after 48 h, the EC50 of Difeno Conazde and Pvrimethanil was 0.27 and 0.81 mg/L, respectively, the virulence index was extremely high, and had great control effect on Alternaria; the control effect of Flusilazole and Kresoxim-mythyl were fine, their EC50 was 1.29 and 1.54 mg/L, respectively, the control effect of Iprodione and Propiconazole were good; their EC50 was 2.07 and 2.79 mg/L; the control effect of Mancozeb was poor and the virulence index was low, the EC50 was 5.17 mg/L. The control effect of the seven fungicides was similar between 72 h and 48 h.