Apple scab is one of the more common foliar diseases of trees and was a widespread problem across Wisconsin in 2024.

If not addressed, canker can kill a tree in a single season and spread to others. According to the Royal Horticultural Society: "Apple canker is a disease caused by a fungus, Neonectria ditissima ...

Fungicide treatments must be repeated each year to protect susceptible trees.

Various diseases affect fruit, and some are caused by fungi while ... apricots, pluots, and cherries). Apple trees are commonly affected by fire blight, apple scab, fruit rots, rusts, and powdery ...