Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Snap bean > Discoloration on stems
Snap bean > Stem > Discoloration on stems
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White Mold
Sclerotinia sclerotiorum
- Infected stems dry out and turn light brown
- Leaves, stems and pods first develop water-soaked lesions
- A white, cottony fungal growth develops on leaves, stems and pods
- Leaves yellow and fall off
- Plant wilts, and may eventually die
- Hard black irregular to oval shaped sclerotia (fungal structures) form within and on infected plant parts
- More information on white mold
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Bean Rust
Uromyces appendiculatus
- Pods and stems develop reddish-brown raised pustules
- Leaves develop reddish-brown, raised pustules surrounded by a yellow halo
- Powdery brown spores can be seen when spots are rubbed with a white tissue
- Severe infections cause leaves to brown, dry, and drop from the plant
- More information on managing diseases in the home garden
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Anthracnose
Colletotrichum lindemuthianum
- Seedling stem has black lesions
- Dark brown to black, sunken oval spots on pods
- Black, sunken streaks or ovals on petioles and stems
- Random dark brown to black lines develop along leaf veins
- More information on managing diseases in the home garden
