BACKGROUND:Meptyldinocap (2,4-DNOPC) is a novel powdery mildew (Erysiphe necator) fungicide which showsprotectant and post-infective activities. However, there is no reliable validated LC-MS/MS method for measuring trace levels of meptyldinocap in cucumber. A method for the determination of 2,4-DNOPC using LC-MS/MS in cucumber and soil was developed. Additionally, the mode of degradation and th…