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.
Black Rot
V-shaped yellowing spreads inward from the leaf margins and the veins darken into a black network. As it advances the whole plant wilts and dies.
General description; not specific to this plant.
How to identify and treat: Black RotPowdery 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.
General description; not specific to this plant.
How to identify and treat: Powdery MildewDowny 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.
General description; not specific to this plant.
How to identify and treat: Downy MildewOther possible causes
- Verticillium Wilt — Only one side of the lower leaves yellows and wilts, and the symptom moves up the plant. S…
- White Rust — Creamy white slightly raised irregular pustules form on the leaf underside and burst throu…
- Fusarium Yellows — Yellowing starts on the lower leaves, the petioles twist and the plant leans to one side. …
Other symptoms on this plant
What other growers did about it
A page like this one can tell you what bok choy 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.