Why does your Delphinium Delphis Jewel 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 Delphinium foliage. It thrives in high humidity and moderate temperatures, often appearing on older leaves before spreading to new growth.
Small, flying white insects can congregate on the underside of Delphinium leaves. While not a powder themselves, their presence and the honeydew they secrete can lead to secondary fungal growth that looks like dust.
These pests produce a white, cottony waxy secretion that can resemble white powder or dust, particularly in the crevices of the plant's stems and leaf axils.
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