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.
Bacterial Spot
Small water-soaked spots appear on the leaves, later turning brown with yellowing around them. Fruit develops water-soaked or scabby spots from which rot spreads.
How to identify and treat: Bacterial SpotCucumber Mosaic Virus
New leaves show a yellow-green mosaic, crinkle, and the whole plant becomes stunted. Fruit colors unevenly and grows misshapen.
How to identify and treat: Cucumber Mosaic VirusPowdery Mildew
White patches appear scattered on the upper leaf surface at first, then the whole leaf is coated in a white powder. Leaves later yellow, brown and die back, and reduced photosynthesis cuts growth and yield.
How to identify and treat: Powdery MildewOther possible causes
Show the other 14
- Downy Mildew — Pale yellow to yellow-brown angular lesions form on the upper leaf surface with a gray-pur…
- Brown Leaf Spot — Small light brown to gray-brown spots form on the leaves and enlarge into irregular lesion…
- Gummy Stem Blight — Gray-brown lesions form at stem nodes and the crown, exuding brown gum and splitting lengt…
- Spider Mites — Fine white stippling spreads across the upper leaf surface, and the leaf eventually whiten…
- Zucchini Yellow Mosaic — Strong yellow mottled mosaic appears on the leaves, which become narrow and shredded in sh…
- Melon Yellow Spot Virus — Numerous small yellow spots appear on the leaves and later turn necrotic so the leaf dies.…
- Gray Mold — Water-soaked brown lesions form on flowers, fruit and leaves, densely covered by a fuzzy g…
- Anthracnose — Light brown to dark brown round lesions with sharp margins form on leaves and fruit, sligh…
- Watermelon Mosaic Virus — Leaves show a yellow-green mosaic, crinkle and stay small. Vine extension is poor and frui…
- Tomato Spotted Wilt — Brown necrotic spots and ring patterns appear on the leaves and the growing tips shrivel a…
- Late Blight — Dark green water-soaked lesions appear on the leaves and expand quickly into brown dead ti…
- Black Spot — On roses, dark brown lesions with radiating edges form on the leaves, which yellow around …
- Ring Rot — The bark of branches and trunk becomes rough and warty, serving as the inoculum source. Fr…
- 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 cucumber 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.