EVALUATION OF THE DOWNY MILDEW (Plasmopara viticola) AND OF THE GRAY ROT (Botrytis cinerea) ATTACK CORRELATED WITH THE LEAF TREATMENTS AND THE SOIL FERTILIZATION

Abstract

" The purpose of the study was to establish the degree of attack of grapevine downy mildew and gray rot on the Muscat Ottonel variety in different technological variants organized in the southern part of Muntenia region in a farm from Hotarele, Giurgiu County in the climatic and meteorological conditions of 2021. The results showed that in the experimental plots treated with 0.5 and 0.6% foliar fertilizers and 200 kg phosphorus and potassium active substance per ha, the degree of attack of the two diseases decreases (0.01% for Plasmopara vitícola and 0.04% for Botrytis cinerea) comparatively to the untreated control (0.13% and 0.54 % respectively). "