Why does your Chrysanthemum Cesar 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 Chrysanthemum foliage. The fungus (typically Erysiphe cichoracearum) thrives in high humidity and moderate temperatures, colonizing the leaf surface.
These small, soft-bodied insects secrete a white, waxy substance that looks like cotton or powder. They tend to cluster in the crevices of the plant, such as where the leaf meets the stem.
Infestations of whiteflies can create a fine white dust-like appearance on the underside of the leaves. Their presence is often accompanied by a cloud of tiny white insects when the plant is disturbed.
Hard water or heavy overhead irrigation can leave white, crusty mineral deposits on the leaves. This is not a biological pathogen but a physical residue left behind as water evaporates.
Your plant might also be experiencing one of these issues:
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