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In the current context of environmental protection, a wide range of chemicals intended to control various pathogens in forest crops have been withdrawn due to the remnant of substances in the soil, thus polluting the natural environment. To achieve the proposed objective, experimental blocks were placed in the Sărata Nursery, Bistrița Forest District, and in the Rîtul de Jos Nursery, within the Livada Forest District, where sprays were made with fungicides with active substances - proquinazide 20% and azoxystrobin 200 g/l + difeconazole 125 g/l. Within the experimental blocks, three repetitions were established, in each repetition being materialized six treatment variants and an untreated control. In both experiments, after applying the treatments the degree of attack was distinctly significant between the treated variants (6.5-11.5%) and the untreated controls (18.2-31%). The effectiveness of the treatments has been moderate (47-69%), which requires new tests to evaluate the usefulness of these substances in the control of oak powdery mildew. [ABSTRACT FROM AUTHOR]