• Botrytis storage mold: Bud rot. Proper ventilation during storage is important. Fungicide sprays before and/or during storage may be helpful.
• Powdery mildew: White fuzzy patches on foliage.
• Root rot (Pythium sp.): Stunted or wilting plants with root discoloration.
• Virescence (phytoplasma): Green flowers or witches’-broom growth pattern. Destroy affected plants.