Roses
Q.

What is this growth on my rose?

Zone Calgary, Alberta, Canada | Anonymous added on July 14, 2016 | Answered

A fruit tumor growing on my rose bush flower stem. Can you please tell me what this is? Thanks Peter

A.
A.Answers to this queston: Add Answer
roseman
Answered on July 16, 2016

Hello Peter. Your rosebushes have been visited by what is called a Cynipid Wasp. Inside the gall is a tiny larvae that will hatch out into another Cynipid Wasp. Here is a link to an article I wrote about them, the galls can take on different forms but in roses the gall you have a photo of is the most common. Article Link: https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-cane-galls.htm

Stan The Rose Man
Consulting Rosarian
Gardening Know How

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