[Skip to Content]
University of Illinois Extension

Cankers on Rose

 

Frequency

4 (1 = rare 5 = annual)  

Severity

5 (1 = very little damage 5 = plants killed)  

Hosts

Rosa spp. (rose) and other plants.    

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.  

Life Cycle

The pathogens (Coniothyrium, Phomopsis, Botryosphaeria, Botrytis and others) 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.


Filed under plants: Flowers

Filed under problems: Fungal Disease

More information is available on Hort Answers.