Harmfulness of Alternaria leaf spot on various genotypes of grape varieties

Abstract

The aim of the research was to assess the harmfulness of alternariosis on various genotypes of grape varieties. The difference in the intensity of development and spread of alternariosis in intra- and interspecific hybrids of grapes was 78.7 and 75.4 % at the end of the growing season. No harmful effect of alternariosis on the yield and quality of grapes of intraspecific hybrid (‘Sauvignon Blanc’ variety) was detected. Strong development on an interspecific hybrid (‘Bianca’ variety) led to the yield decrease by 48.6 %, and sugar content reduction – by 7.7 %.