Objective] The effects of four QoI fungicides on potato and tomato and cumumber quality and yield formation under disease-free conditions were studied in order to research the physiological effects of four QoI fungicides on these fruit veg-etables and explore the range of minium dose for the obvious physiological effect and the dose for the maximum effect. [Method] The effects of four strobilurin fungi-cides on yield formation and quality were studied under disease-free conditions in the field. Two applications of each strobilurin fungicide were designed. The yield and commercial ratio for each application were investigated. [Results] The minimum dose for the obvious physical effect on potato and tomato and cucumber was lower than 133 mg/L , the dose for maximum effect on patoto and cucumber of the four stro-bilurin fungicides maybe also lower than 667 mg/L. The dose of fenaminstrobin and pyraoxystrobin for maximum effect on tomato maybe also lower than 667 mg/L. [Conclusion] The study suggested that enotroburin, fenaminstrobin, pyrametostrobin and pyraoxystrobin were able to increase the yield and ratio of high quality potato and cucumber and tomato.
[目的]探索唑菌酯及其混剂防治黄瓜靶斑病的效果及剂量。[方法]采用菌丝生长速率法测定唑菌酯与苯醚甲环唑对靶斑病菌的联合毒力,验证20%唑菌酯SC及24%唑菌酯·苯醚甲环唑SC对黄瓜靶斑病的田间防效。[结果]唑菌酯与苯醚甲环唑对靶斑病菌的EC50值为（11.49±1.19）、（0.82±0.06）mg/L;唑菌酯与苯醚甲环唑1颐1、1颐2、1颐3三个配比有增效作用。[结论]靶斑病发病初期间隔7 d连续喷施2～3次20%唑菌酯SC或24%唑菌酯·苯醚甲环唑SC有较好防效;20%唑菌酯SC推荐剂量为150～300 g a.i./hm^2,而24%唑菌酯·苯醚甲环唑SC推荐剂量为360～540 g a.i./hm^2。
