室内恒温条件下 ,采用孢子囊萌发抑制法测定了甲霜灵、福美双及其复配对辣椒疫病的毒力 ,用Horsfall的毒力试验设计和Wadley的增效比率法评价了2种杀菌剂的联合作用。结果表明 ,EC50 剂量甲霜灵与福美双混用表现增效作用 ,其中70:30混剂配比的增效比率为3.18。接种试验也证明其对辣椒疫病具有较好的防治作用。 Under the constant temperature in laboratory, the toxicity of metalaxyl, thiram and their complex to Phytophthora capsici was determined by spore germination inhibition method. The toxicity of two fungicides were evaluated by Horsfall’s toxicity test design and Wadley’s synergistic ratio method Joint action. The results showed that EC50 dose Metalaxyl and thiram double synergistic performance, of which 70:30 mixture ratio synergistic ratio of 3.18. Vaccination test also proved that it has better prevention and cure effect on pepper blight.