I'm growing bok choy and other leafy greens in an outdoor hydroponic system. There are clusters of tiny shotgun spots, almost holes, on the leaves. Anyone know what causes this and how to control it?
Pictures would help. My first thought is alternaria.
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These are really tiny holes clustered very close together. They are also on basil, 3 types of mint and oregano, too. Could it be flea beetles?
Flea beetles would be my first guess; if so, they should be visible when inspecting the plants. Tiny, shiny, and jumpy.