Correlations between susceptibility of sunflower genotypes to the affection by different pathogens

OIL CROPS. Scientific bulletin. VNIIMK, 2006, iss. 1 (134). Genotype correlations between different necrotrofic pathogen affection levels of sunflower interline hybrids, parental forms and varieties were calculated with data of ecologic and competitive trials. Concerning different pathogen pares affection of sunflower genotypes did not correlate significantly or correlation coefficients were positive, substantial to rg = 0.68. Such correlation is considered as illustrations of existence of common unspecific resistance of sunflower to affection by due pathogens. It appears to be correlated the responses of sunflower genotypes on inoculation by grey rot, Fusarium, Phomopsis and Verticilum Wilt. pathogens. Affection of sunflower genotypes by Phomos varied independently from susceptibility to abovementioned pathogens, but correlated with affection degree of sunflower by Alternaria (rg= 0.55).