不同甲氧基丙烯酸酯类杀菌剂对辣椒疫霉菌的离体活性及防病方式的影响

Inhibition of Strobilurin Fungicides against Phytophthora capsici

比较了4种甲氧基丙烯酸酯类杀菌剂对辣椒疫霉菌的离体活性及其对辣椒疫霉病的保护和治疗作用。结果表明:醚菌酯、嘧菌酯、烯肟菌酯和唑菌胺酯对辣椒疫霉菌菌丝生长的抑制作用相对较差,EC50分别为8.88,34.64,125.90,17.04μg·mL-1;对孢子囊形成具有较高抑制活性,EC50分别为1.31,3.43,6.92,1.92μg·mL-1;对孢子囊萌发活性更高,EC50分别为0.94,2.50,1.73,0.76μg·mL-1。活体试验表明,4种甲氧基丙烯酸酯类杀菌剂对辣椒疫霉病具有很好的保护和治疗作用,且保护作用强于治疗作用。4种杀菌剂保护作用的防病效果均在67.9%以上。

Four commercial formulations of strobilurin fungicides, kresoxim-methyl, azoxystrobin, enestroburin and pyraclostrobin were evaluated for their efficacy, curative and protection action against pepper phytophthola blight caused by Phytophthora capsi- ci. The results in vitro showed that 4 fungicides including kresoxim-methyl, azoxystrobin, enostroburin and pyraclostrobin could inhibit the mycelium growth of Phytophthora capsici with their EC50 at 8.88, 34.64, 125.90, 17.04 μg·mL^-1, respectively. Sporangium formation of Phytophthora capsici was inhibited significantly by 4 fungicides with their EC50 at 1.31, 3.43, 6.92, 1.92 μg·mL^-1. 4 kinds of fungicides showed stronger inhibition against sporulation germination with their ECS0 values at 0.94, 2.50, 1.73, 0.76μg·mL^-1. The results in vivo showed that these fungicides showed more protective and curative activities and protection action was better than curation. Control efficacy of 4 fungicides used before infection of Phytophthora capsici have reached more than 67.9 percent.