BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on September 4, 2023
It looks a lot like damage from night feeding pests, such as slugs, snails, and cutworms. Diatomaceous earth can reduce snails and slugs, but squishing the cutworms may be necessary.
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/dahlia-pests-and-diseases.htm
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