Problem With Dahlias

Question

I grow several dahlias especially Bishop of Llandaff. The last couple of years I have noticed what can only be described as ‘scraping’ on the stems. The stem then snaps off. What could be the cause of this?

Answer 1

It could be cutworms. Take a flashlight out at night and look for the pests. Here is more on how to combat them:

https://www.gardeningknowhow.com/plant-problems/pests/insects/get-rid-cutworms.htm

https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/dahlia-pests-and-diseases.htm