Garden Pests and Diseases: What's eating me?, 1 by grrrlgeek

grrrlgeek wrote:
I'm hoping you guys can help me crack this case.
Facts: holes in leaves in my narrow "invasives" bed. Plants eaten interspersed with plants not eaten. No slug trails or damage on Comfrey (favorite of slugs). Holes don't look like slug damage to me anyway. No actual bugs seen.
Plants eaten: CatNIP, Lemon Balm, Peppermint.
Plants untouched: 2 types of CatMINT, Comfrey.
Treatment so far: None, bed has gotten Sluggo'd once this season.
Pests seen here last season: Slugs, earwigs.
Evidence: Pictured Lemon Balm leaf.