Dark Spots on Bush Bean Leaves
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GardenSays
Best match: Bacterial blight. Manageable if you act.
- Best match
- Bacterial blight
- Severity
- Act soon
- Causes checked
- 1
Based on angular spots on leaves on the lower leaves with moist soil, the closest match is bacterial blight. Confirm it against the actual plant: Small, angular, water-soaked spots (bounded by the leaf veins) most visible in the mid-to-upper canopy, turning yellow then brown with a yellowish-green halo around each spot.
- 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: Small, angular, water-soaked spots (bounded by the leaf veins) most visible in the mid-to-upper canopy, turning yellow then brown with a yellowish-green halo around each spot.
- 2.Avoid working plants or overhead-watering while leaves are wet — that's how it spreads; remove badly affected leaves; rotate beans out of that spot next year.
- 3.Collapsing fast (days, not weeks)? Photograph it and check with your county extension before treating
Calculated result · 1 verified source · Checked 2026-07-17 · How we decide
Why
What to do: Avoid working plants or overhead-watering while leaves are wet — that's how it spreads; remove badly affected leaves; rotate beans out of that spot next year.
- 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
Bush Beans: angular spots on leaves — 1 known cause evaluated (extension-sourced)
- 2. Your conditionsCalculated result
Location on plant: lower; soil: moist. Causes whose known pattern matches these conditions rank higher — this narrows the list, it doesn't identify anything.
- 3. 1. Bacterial blightmatch score 1Calculated result
Distinguishing signs: Small, angular, water-soaked spots (bounded by the leaf veins) most visible in the mid-to-upper canopy, turning yellow then brown with a yellowish-green halo around each spot.
Data sources
- University of Minnesota Extension — Bacterial blight on soybean (snap bean cross-reference) — Bacterial blight is most evident on leaves in the mid-to-upper canopy: small, angular, water-soaked spots that turn yellow then brown as tissue dies, with darkening spots surrounded by a yellowish-green halo. (checked 2026-07-17)
What changes this answer
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