Canker - Fact Sheet
Cankers may be either bacterial or fungal. It is the fungal form that affects apples and pears. Fungal spores enter via pruning cuts, wounds or cracks in the bark. Canker can be very destructive if left untreated.
Cankers may be either bacterial or fungal. It is the fungal form that affects apples and pears. Fungal spores enter via pruning cuts, wounds or cracks in the bark. Canker can be very destructive if left untreated.