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.
Cabbage Armyworm
Young larvae feed in groups on the leaf underside, eating only the tissue so the leaf turns translucent white. Larger larvae chew big holes and can strip a plant bare in a single night.
How to identify and treat: Cabbage ArmywormLeaf Spot
Small round brown to gray-white lesions appear on the lower leaves, the centers turning gray with tiny black specks. As they multiply the leaf yellows and drops early.
General description; not specific to this plant.
How to identify and treat: Leaf SpotRust
Small raised orange-yellow to red-brown pustules form on both leaf surfaces, then rupture and release powdery spores. Heavy infection yellows the leaves and kills them early.
General description; not specific to this plant.
How to identify and treat: RustOther possible causes
- White Rust — Creamy white slightly raised irregular pustules form on the leaf underside and burst throu…
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what spinach 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.