四种羧酸酰胺类杀菌剂对辣椒疫霉菌三个不同发育阶段的毒力比较

Comparison of the toxicity of four carboxylic acid amide fungicides against Phytophthora capsici at their three different life stages

摘要: 室内离体条件下测定了4种羧酸酰胺类(CAAs)杀菌剂双炔酰菌胺、烯酰吗啉、丁吡吗啉和氟吗啉对辣椒疫霉3个不同生长发育阶段的抑制活性。结果表明:4种杀菌剂抑制辣椒疫霉菌丝生长的EC50值分别为1.95×10-2、1.41、1.85、2.31 μ g/mL;对病菌孢子囊形成的抑制效果最好,其EC50值分别为2.00×10-4、1.50×10-3、2.60×10-3、4.30×10-3 μ g/mL;抑制游动孢子萌发的EC50值分别为4.60×10-3、0.373、0.494、0.635 μ g/mL。4种CAAs杀菌剂对辣椒疫霉的抑制作用均高于对照药剂甲霜灵、吡唑醚菌酯及嘧菌酯。

Abstract: The toxicity of four carboxylic acid amide fungicides (CAAs) against Phytophthora capsici at their three different life stages was investigated.The results showed that mandipropamid,dimethomorph,pyrimorph and flumorph could effectively inhibit mycelial growth(with EC50 values of 1.95×10-2,1.41,1.85,2.31 μ g/mL,respectively),sporangia production (with EC50 values of 2.00×10-4,1.50×10-3,2.60×10-3,4.30×10-3 μ g/mL,respectively) and cystospore germination(with EC50 values of 4.60×10-3,0.373,0.494,0.635 μ g/mL,respectively) of P.capsisi .The tested pathogen strain was more sensitive to four CAAs than to metalaxyl,pyraclostrobin and azoxystrobin.