P&PDL Picture of the Week for
January 31, 2011

Disease Resistant Roses

Janna Beckerman, Associate Professor, Department of Botany & Plant Pathology, Purdue University

It's easy to be seduced by all the beautiful pictures of plants that arrive in the yearly deluge of gardening catalogs. What these pictures never show you are the numerous diseases caused by fungi, bacteria, viruses, and nematodes! Disease-resistant plants prevent, or greatly reduce, infection by many of these pathogens. No one wants roses that look these—and by choosing black spot resistant roses you can avoid this problem, and also avoid spraying fungicides! In addition to the Knock-Out roses, there are numerous varieties—some of which are fragrant, like the 'Pavement series' ('Foxy Pavement', 'Snow Pavement', 'Purple Pavement') or climbers, like 'William Baffin' and 'John Davis.' The 'Easy Elegance Series' (with stand outs like 'My Hero', 'Sweet Fragrance', 'Grandma's Blessing') are not only beautiful, disease resistant, landscape roses, but make a lovely cut flower as well. Best of all, using these diseases resistant roses mean not only more flowers and less spots, but less work and fewer pesticides!

For more information on black spot, see BP-139, Rose Black Spot (pdf file)

Click image to enlarge

Black spot on rose

Rose black spot

Resistant rose

'William Baffin' - Disease resistant rose

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service