Gadenin日本語Get the appCheck these first
- Does it rub off with a finger? Powder that rubs off is a fungus; marks that stay are scarring from pests.
- Is it on the upper or lower leaf surface, or concentrated on new shoots and leaf joints?
- If it is cottony, look inside the fluff for insects.
Most likely causes
From the pests and diseases recorded for this plant, the ones whose symptoms match, most serious first. Symptoms alone rarely confirm a cause, so use the linked page to check the signs and treatment.
Tobacco Cutworm
Many larvae gather on the leaf underside and graze the tissue away, leaving white skeletonized patches. Once they disperse they cause heavy damage to leaves, pods and fruit.
How to identify and treat: Tobacco CutwormViolet Root Rot
The tree gradually loses vigor and the leaves shrink, sometimes wilting abruptly in summer. A purple-brown or white mycelial mat covers the root surface and the bark peels away easily.
General description; not specific to this plant.
How to identify and treat: Violet Root RotSclerotinia Rot
The crown, stem or head rots in a water-soaked way and is covered in white cottony mycelium. Black sclerotia later form inside and on the surface, and the plant wilts and dies.
General description; not specific to this plant.
How to identify and treat: Sclerotinia RotOther possible causes
- White Rust — Creamy white slightly raised irregular pustules form on the leaf underside and burst throu…
- Leaf Spot — Small round brown to gray-white lesions appear on the lower leaves, the centers turning gr…
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what sweet potato white powder on leaves is and what to try. What it cannot tell you is what actually happened to someone who had it on the same plant, at the same point in the season, and what they did next.
Gadenin is a free garden journal built around that. You photograph the plant, tag what you are seeing, and the entries line up by date for each plant you grow.
- Tag the problem and the app tells you how many other growers have logged the same thing on the same plant.
- Growers who make their records public can be followed, so you can read what they did and how it turned out.
- Next season your own entries come back at the same point in the year, so you check the plant before it starts.
Free on iPhone. Recording, tagging and reading public records cost nothing.