Gadenin日本語Get the appCheck these first
- Does the yellowing start at the bottom of the plant or at the tips?
- Are the veins still green while the rest of the leaf fades? That points to a nutrient deficiency.
- Look under the leaves for tiny insects or white specks.
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.
Downy Mildew
Pale yellow to yellow-brown angular lesions form on the upper leaf surface with a gray-purple mold in the matching spot underneath. Lesions merge, the leaves die back and the plant declines early.
How to identify and treat: Downy MildewTomato Spotted Wilt
Brown necrotic spots and ring patterns appear on the leaves and the growing tips shrivel and darken. Fruit develops concentric yellow rings that make it unmarketable.
General description; not specific to this plant.
How to identify and treat: Tomato Spotted WiltEtiolation
Internodes stretch long, stems are thin and leaf color is pale. The plant topples easily and becomes vulnerable to pests and disease.
General description; not specific to this plant.
How to identify and treat: EtiolationOther possible causes
- Bacterial Spot — Small water-soaked spots appear on the leaves, later turning brown with yellowing around t…
- Potato Leafroll — Lower leaves roll inward into tubes and become stiff and leathery. The plant is stunted an…
- Powdery Mildew — White patches appear scattered on the upper leaf surface at first, then the whole leaf is …
- Rust — Small raised orange-yellow to red-brown pustules form on both leaf surfaces, then rupture …
- Leaf Spot — Small round brown to gray-white lesions appear on the lower leaves, the centers turning gr…
- Root Rot — Fine roots rot brown to blackish brown, growth stops and the lower leaves yellow. The plan…
- Fusarium Yellows — Yellowing starts on the lower leaves, the petioles twist and the plant leans to one side. …
- Root-lesion Nematode — Elongated blackish brown necrotic lesions form on the root surface and fine roots rot away…
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what head lettuce leaves turning yellow 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.