White Lines in Tomato Leaves: What It Means and What to Do
Set your conditions — the recommendation updates instantly.
GardenSays
Best match: Leafminers. Manageable if you act.
- Best match
- Leafminers
- Severity
- Minor
- Causes checked
- 1
Based on white squiggly lines in leaves on the whole plant with moist soil, the closest match is leafminers. Confirm it against the actual plant: Meandering pale tunnels inside the leaf tissue — larvae feeding between leaf surfaces.
- This is a symptom-pattern match from your written description, not a lab diagnosis. If the plant is collapsing over days (not weeks), treat it as the worst plausible cause until ruled out.
Do this this week
- 1.Confirm it first: Meandering pale tunnels inside the leaf tissue — larvae feeding between leaf surfaces.
- 2.Cosmetic on tomatoes: pick off mined leaves. Sprays don't reach the larvae; parasitic wasps usually control them.
- 3.Collapsing fast (days, not weeks)? Photograph it and check with your county extension before treating
Calculated result · 3 verified sources · Checked 2026-07-15 · How we decide
Why
What to do: Cosmetic on tomatoes: pick off mined leaves. Sprays don't reach the larvae; parasitic wasps usually control them.
- A symptom tree ranks causes by how well your conditions match each cause's known pattern — the distinguishing signs are how you confirm it on the actual plant, not a lab result.
- Most leaf problems trace to water, weather, or common leaf-spot fungi; true plant-killers are rarer but worth ruling out first.
When this doesn't apply
- If the plant is collapsing fast (days, not weeks), treat it as the most severe possibility on the list until proven otherwise.
- Multiple symptoms at once usually means the top cause here plus plain stress — fix watering first, then re-check.
How this was calculated
- 1. SymptomSource guidance
Tomato: white squiggly lines in leaves — 1 known cause evaluated (extension-sourced)
- 2. Your conditionsCalculated result
Location on plant: any; soil: moist. Causes whose known pattern matches these conditions rank higher — this narrows the list, it doesn't identify anything.
- 3. 1. Leafminersmatch score 3Calculated result
Distinguishing signs: Meandering pale tunnels inside the leaf tissue — larvae feeding between leaf surfaces.
Data sources
- University of Minnesota Extension — Growing tomatoes in home gardens (common problems) (checked 2026-07-15)
- UMN Extension — What's wrong with my plant? (tomato diagnostic) (checked 2026-07-15)
- Cornell Vegetables — Disease factsheets (checked 2026-07-15)
What changes this answer
Where on the plant?
Soil right now
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People also ask
How do I diagnose other tomato problems?
Best match: Leafminers. Manageable if you act. Calculate yours →
Am I watering correctly?
Water deeply 2× per week, about 1.6 gallons per plant each time. Calculate yours →
Could it be a feeding problem?
Usually nothing now — wait until when the first fruits reach about 1 inch (golf-ball size) (one catch-up feeding is fine if you never fed at planting). Calculate yours →
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