In order to díagnose the causative agents of root rot Vitis labrusca L. and dísease management carried out the research work in the laboratory of Plant Protection - Plant Pathology, Faculty of Agricultura! Sciences of the Natíonal University of San Martín of San Roque Cumbaza in the regíon of San Martín. Descriptive and quantitative method was used; lt was conducted under completely randomízed design; evaluating symptoms , morphological and biometric characteristics of the isolates, pathogenicity test , chemical and biological control , íncídence , losses and cultural practices. As results have been diagnosed Lasiodiplodia parva is the cause of dry charcoal rot roots and stem, while wet causes oligandrum Pythium root rot. Fungicides 100% inhibited the growth of L. parva are : Benomyl 50 % Metalaxyl 8% + Mancozeb 64% and 50 % Thiophanate methyl + Thiram 30 % and Pythium oligandru...