PHYTOPATHOLOGICAL ASSESSMENT OF THE INFECTION OF GRAPE GENOTYPES WITH OIDIUM DISEASE IN A NATURAL BACKGROUND

In this study, phytopathological assessment of oidium infection of grape varieties and forms was carried out based on I.N. Naydenova evaluation method. In the Absheron Scientific-Research Base, a phytopathological assessment of oidium infection of 77 grape varieties and forms was carried out in the natural background. Cluster analysis was constructed according to the Euclidean distance index of the UPGMA method by using PAST statistical software package. The studied genotypes were grouped into 5 clusters according to their resistance. In the first cluster, 3 genotypes were highly resistant with 1-1,5 points of infection, in the second cluster 22 genotypes were high susceptible with 5 points of infection and in the third cluster there were 29 genotypes with 4-4,5 points of susceptible samples. The fourth cluster grouped 6 genotypes that showed resistance to oidium, which were selected as resistant genotypes with 2-2,5 points of infection. 17 genotypes were grouped in the last cluster of the dendrogram, which showed tolerant with 3-3.5 points of infection. At result of evaluation Ag Khalili, Arayatli gara uzum, Qara uzum are determined as high resistant forms.