[Use of cytochemical methods for diagnosis in fungicide research].

Cytochemical localization of acid and alkaline phosphatases, cytochrom c-oxidase, peroxidases and catalase was carried out on Phytophthora infestans (Mont.) de By. and Mucor mucedo (L.) Fres. First results are obtained about the influence of sublethal dosages of fungicidal compounds on the demonstration of these enzymes in the electron-microscope.