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This is caterpillar frass. It's a pretty common sight in spring when caterpillar eggs hatch and the larvae start eating our plants.
If you want to find the culprits, they often hide on the underside to the leaf.
If they're causing a lot of damage, hand pick or use Bt (Bacillus thuringiensis).
However, keep in mind that those caterpillars will turn into pollinating moths and butterflies. Destroy them all and you destroy valuable partners in the garden.