氟吗啉对大豆疫霉菌的抑制作用

防治大豆疫病主要措施之一是使用甲霜灵，但由于其作用位点单一，病菌易对其产生抗性突变，为选出可替代甲霜灵的新型杀菌剂防治大豆疫霉根腐病，采用多位点杀菌剂氟吗啉，室内离体条件下测定了氟吗啉等3种杀菌剂对供试大豆疫霉菌各生长阶段的抑制作用。结果表明：氟吗啉对所测定的菌株4个发育阶段均有显著的抑制作用，氟吗啉对大豆疫霉菌菌丝生长EC50 值为0.1906μg/mL，EC95 值为0.4735 μg/mL；在0.5 μg/mL 浓度下对大豆疫霉菌孢子囊形成和孢子萌发抑制率达100%，低于达到相同抑制效果的金阿普隆和甲霜灵；说明该药剂在离体条件下能够有效抑制大豆疫霉菌的生长，效果好于金阿普隆和甲霜灵。

Study on Restrain Inhibition of Flumorph to Phytophthora Sojae

One of the main measures to combat Phytophthora sojae was using Metalaxyl. Because of its role in a single site and easy mutant bacteria resistant, it is necessary to select a new fungicide metalaxyl alternative Phytophthora root rot. Using flumorph, the bioactivity of 3 fungicides against different stages of Phytophthora sojae Ps411 was compared in vitro. The results showed that flumorph had significant inhibitory effect on the 4 different growth stages of the strain, with 50% effective concentration (EC50) values was 0.1906μg/mL. Their 95% effective concentration (EC95) value was 0.4735 μg/mL. Flumorph at the concentration of 0.5 μg/mL, can lead the inhibit rate of growth of mycelium, formulation of sporangium and germination of zoospore of Phytophthora sojae to 100%, the concentration was lower than Apron XL, Metalaxy which lead to the same inhibition rate. It indicated that Flumorph can obviously inhibit the growth of P.sojae in vitro, and effect is better than that of Apron XL and Metalaxy.