Do you see any of these little black bugs?
flea beetles would be my guess.
Here's something about organic control of flea beetles:
https://www.planetnatural.com/pest-probl ... e-control/
Flea Beetle Control
Remove garden trash and plow or roto-till under weeds to reduce overwintering sites.
Floating row covers are extremely effective when placed on seedlings and left in place until plants are old enough to tolerate beetle damage.
Place yellow sticky traps throughout garden rows every 15 to 30 feet to capture adults.
Beneficial nematodes applied to the soil will destroy the larval stage, reducing root feeding and helping to prevent the next generation of adults from emerging.
Diatomaceous earth can be dusted over plants to control the number of feeding adults.
If pest populations become intolerable, spot treat with botanical insecticides as a last resort.
Tip: Trap crops, such as mustard and radish, can be planted near garden areas to draw pests away.
Pay attention to the trap crop idea. I haven't had to deal with flea beetles, but trap crops have worked very well for me for some other pests (Japanese beetles, leaf miners). Diatomaceous earth is my go-to for all kinds of crawling pests including slugs and snails. Main drawback is that it has to be re-applied after rain and where I am we get a LOT of rain. Your DE will last a lot longer if you are somewhere with a dry summer!