Isolation and Identification of Races ofSphaerotheca pannosavar.rosae

Publisher Website
Google Scholar
Abstract
Nine isolates of S. pannosa var. rosae, the pathogen that causes powdery mildew of roses, were obtained from infections on 7 hybrid rose cultivars and 2 Rosa spp. [R. rugosa, R. multiflora]. Isolates were initiated on detached leaves, increased on host plants, and inoculated to rose cultivars to test for differential reactions. Virulence was evaluated by assessing the infection type of individual lesions and the percentage of leaf area covered with sporulating colonies. Five races of S. pannosa var. rosae were identified, and virulence formulae were developed to describe them on 4 differential rose cultivars. The pathogenicity markers described in this investigation will facilitate future genetic studies of S. pannosa var. rosae.

This publication has 3 references indexed in Scilit: