Q&A – What is this growth on my blackberry bush?
Question:
What is this growth on my blackberry bush? Is it a crown gall?
Answer:
This is blackberry knot gall. It is caused by a wasp. The wasp lays its eggs in the blackberry cane and the plant swells up which creates a place for the wasp larvae to live. It does not hurt the plant but if you would like you can prune it out.
Diastrophus nebulosus - Blackberry Knot Gall Wasp
What is this growth on my blackberry bush? Is it a crown gall?
Answer:
This is blackberry knot gall. It is caused by a wasp. The wasp lays its eggs in the blackberry cane and the plant swells up which creates a place for the wasp larvae to live. It does not hurt the plant but if you would like you can prune it out.
Diastrophus nebulosus - Blackberry Knot Gall Wasp