Gadenin日本語Get the appCheck these first
- What colour are the spots, and do they have a yellow halo?
- Are there concentric rings or a mosaic pattern?
- Are the spots only on leaves, or also on stems and fruit?
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.
Rust
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.
How to identify and treat: RustAlternaria Black Spot
See the pest and disease page for how to identify it.
Leafminer Flies
Winding white tunnels run through the leaf with the larva at the head of the mine. Heavy mining turns the whole leaf white and dead, cutting photosynthesis.
How to identify and treat: Leafminer FliesOther possible causes
The three above are the causes on record for this symptom.
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what leek leaf spots 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.