Zinnia seedling hole in leaves and margins eaten

Asked June 4, 2020, 11:48 AM EDT

Hello! Three weeks ago I transplanted my Zinnia seedlings (70 of them) to a raised bed on the south side of my home. For the past week, I have noticed that the leaves have holes in them and some of the leaves have been chewed off.
After some research, I found that this could be slugs or earwigs. I have not seen any slime trails in the bed, but I set out beer bait traps among the seedlings. I buried plastic containers into the soil so that the lip of the container is at the same level as the dirt, added beer. No slugs have come to the bait. Should the bait just be left out indefinitely?
What, if any bait can be used to see if earwigs are the culprit?

Thank you for your help.

Washington County Oregon

1 Response

Thank you for your question. Zinnias have a few pests (and slugs aren't listed) (http://ipm.ucanr.edu/PMG/GARDEN/FLOWERS/zinnia.html), but the one I would suspect, based on the holes, is the earwig. You can read about them and how to control them here: http://ipm.ucanr.edu/PMG/PESTNOTES/pn74102.html

In terms of the slug bait, the beer will either evaporate or become brackish in short time, so you might as well take it up. And you can save the hops (and $$) by combining water, sugar and yeast and get the same effect.
Hope this is helpful. Good luck!