I have a serious problem with flea beetles at my community garden plot. They are eating everything.
The radishes are the hardest hit, followed by the kale, then the broccoli, collards, and kohlrabi. I’ve read that seedlings are most vulnerable, but that doesn’t seem to be the case here — even my larger kale and kohlrabi plants are being seriously damaged. We used row cover at the start of the season to protect these plants from cold. This probably protected them from the flea beetles too. If I’d known that, I would have kept the covers on longer.
What should I do? I’ve looked into controls, and the organic options seem quite limited. Neem and insecticidal soap aren’t very effective. I’ve read that DE can be — should I try that? Any advice would be appreciated. I’d like to get this problem under control before I plant my tomatoes and peppers out.