Why does your Phaseolus lunatus have white powder? Diagnose the cause and fix it with our step-by-step guide.
This is the most common cause of white, flour-like patches on Lima bean leaves. It is a fungal disease caused by Oomycetes that thrives in humid conditions with high leaf density.
Small, winged insects that congregate on the undersides of Lima bean foliage can leave behind white, waxy residue or appear as moving white specks. Their feeding causes chlorosis and honeydew secretion.
These sap-sucking pests produce a white, cottony wax to protect themselves. They are often found in the crevices of stems or near new growth on the bean plant.
While typically gray, early stages of Botrytis on Lima bean buds or young leaves can appear as a fuzzy, pale coating that eventually turns necrotic.
Your plant might also be experiencing one of these issues:
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