Hosts
Rosa spp. (rose) and other plants.
Cankers on Rose
Pathogen Type
Scientific Name
Coniothyrium, Phomopsis, Botryosphaeria, Botrytis and others
Frequency
4
Severity
5
Symptoms
Cankers can cause dead areas on the stem that can enlarge and eventually kill the stem or even the entire plant. However, depending on host and pathogen the symptoms can vary.
Cycle
The pathogen overwinters on dead plant material. Spores are wind blown. During wet weather, spores infect stressed plants.
Management
Keep plants healthy - water, and fertilize to improve vigor. Practice good sanitation - prune out/remove infected tissue when plant is dry but before spring growth starts. Prune cankered canes immediately above the second healthy node below the diseased areas, or to the next branch down, or to the main stem if needed. There are no effective fungicides for most canker fungi.
Credit
James E Schuster, retired Extension Specialist, Horticulture & Plant Pathology, University of Illinois
PathogenID
156
Images
Image
picID
18371
Image
picID
19035