Small holes in bean leaves can come from beetles, caterpillars, slugs, or weather damage. Inspecting the pattern and underside of leaves helps identify the problem before the plant loses too much foliage.
Look at fresh and older leaves
Compare the newest leaves with older ones and note whether damage is round, ragged, or concentrated at the edges. Check at dusk if slugs or caterpillars are suspected.
Inspect the underside
Look for eggs, droppings, webbing, or small insects. Avoid spraying before confirming the pest and considering beneficial insects.
Reduce hiding places
Remove weeds, improve airflow, and keep damaged leaves off the soil. Hand-pick visible pests when practical.
Monitor growth
Healthy new leaves and steady growth are encouraging. Widespread defoliation or repeated damage may require local guidance.