- Armillaria Root Rot
- European Canker (Nectria galligena)
- Phytophthora Root and Crown Rot
- Powdery mildew
- Pear Scab (Venturia pirina)
- Apple Scab (Venturia inaequalis)
- Fire Blight (Erwinia amylovora)
- Blossom Blast (Pseudomonas syringae)
- Pear Decline phytoplasma
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