Apple Scab
Apple Scab affects the leaves, flowers, fruit, and twigs of crabapples, mountain ash, firethorn, and pear.
The disease starts as water soaked spots on the leaves that turn olive colored, then brown and take on a velvety appearance. Severely infested trees will have spots on the twigs, flowers, and fruit.
It’s not uncommon for severely infested trees to become completely defoliated by mid-late August.
The disease survives from year to year in the fallen leaves and twigs. It’s best to remove leaf litter completely from beneath trees that have a history of infestation.
