- Root-knot nematode: Swollen, knobby areas on roots.
- Foliar nematode: Distortion and yellow areas on foliage.
- Powdery mildew: White dusty patches on foliage or flowers.
- Impatiens necrotic spot virus: Brown spots in foliage or collapse of center leaves; resembles the more commonly seen crown rot caused by Phytophthora parasitica or Pythium myriotylum.
