Tomato leaves turning yellow: causes and fixes

The most common reasons for yellow tomato leaves are: (1) normal senescence of lower leaves as the season progresses, (2) early blight (*Alternaria solani*), (3) nitrogen deficiency, (4) Septoria leaf spot, and (5) magnesium deficiency. Fusarium and verticillium wilts also cause

By Thomas Joseph Published 2026-06-11 Updated 2026-06-13 Reviewed by Thomas Joseph 8 min read

Yellow tomato leaves are one of the most common panic searches in midsummer, and the challenge is that the same symptom has eight meaningfully different causes. Getting the diagnosis right before reaching for a spray or fertilizer is the difference between a useful intervention and a wasted one.

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Quick diagnostic table

Pattern of yellowing	Most likely cause	Confirms
Lower leaves yellow first, progressively up plant	Early blight, or normal senescence	Dark target-ring spots on yellow leaves = blight; no spots = normal senescence
Leaves yellow between veins, veins stay green	Magnesium deficiency	Interveinal chlorosis; older leaves affected first
Leaves yellow, random brown spots with yellow halos	Septoria leaf spot	Small, circular spots with darker border
Whole plant yellows and wilts	Fusarium or verticillium wilt	Cut the stem base; if brown streaking inside, it's wilt
Uniform pale yellow, new growth affected	Nitrogen deficiency	Yellowing starts with newest, youngest leaves
Upper leaves curl and turn yellow	Tomato mosaic virus or broad mite	Look for deformed, narrow leaves; mosaic discoloration
Yellow mottling on leaves	Various viruses	Random pattern; mosaic texture
Yellow leaves with tiny bronze stippling	Spider mites	Webbing under leaves; stippled (not solid) yellowing

Reader questions

Questions from other readers about this guide. Ask your own — if it's a good question, the answer goes here for the next reader.

Should I remove yellow tomato leaves?

Remove diseased or dead lower leaves when they have spots or are fully yellowed. Per Penn State Extension, removing infected tissue "reduces the inoculum load" for fungal diseases. Do not strip healthy green leaves just because they're lower on the plant — green leaves are photosynthesizing.

Does Epsom salt cure yellow tomato leaves?

Only if the cause is magnesium deficiency (interveinal chlorosis on older leaves). Per Penn State Extension, "Epsom salt does not benefit plants that don't have a magnesium deficiency." Applying it when the cause is a fungal disease or nitrogen deficiency does nothing. Diagnose before treating.

Can yellow tomato leaves recover?

The leaf itself will not turn green again once yellowed. But the plant can be prevented from further yellowing and new healthy growth will continue. Per NC State Extension, the goal of disease management is "protecting healthy leaves from infection," not reversing existing damage.

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Tomato leaves turning yellow: causes and fixes

Quick diagnostic table

Tomato leaves turning yellow: causes and fixes

Quick diagnostic table

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