Rose – Black Spot Canker on Stem Walter Reeves: The Georgia Gardener

Q: Can you tell me what is causing the brown spots on my Knockout rose stalks? A: At first I thought it was rose cane canker but pathologist Jean Williams-Woodward says: "Cytospora canker tends to have a tanner center and the canker girdles the stem. These look more like black spot infection of the stems.

Rose – Black Spot Canker on Stem Walter Reeves: The Georgia Gardener

Resource Guide for Organic Insect and Disease - Cornell University

Vegetables diseases by virgiulloac - Issuu

Stumped by cane disease? Be ruthless, for your roses' sake - The San Diego Union-Tribune

Rose – Black Spot Canker on Stem Walter Reeves: The Georgia Gardener

Raker-Roberta's Trial Gardens

How to Identify, Prevent, and Treat Black Spot Damage on Roses

Stumped by cane disease? Be ruthless, for your roses' sake - The San Diego Union-Tribune

Rose Canker - Symptoms And Cures For Stem Canker In Roses

Loropetalum – Bacterial Stem Gall Walter Reeves: The Georgia Gardener

Plant Inventory No. 206, Part I - Germplasm Resources Information

Rose Canker Identification and Treatment