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Apple scab
The Morton Arboretum has over 140 crabapple trees on its grounds. This is one of many species of crabapple (Malus spp.) found in the Morton Arboretum. The last crabapple left on this tree that appears to be affected by apple scab, which is a fungal infection. It is named for the dark patches it creates on the crabapple skin and can cause trees to drop both leaves and fruit prematurely. The majority of the other crabapple trees in the arboretum still had leaves and fruit.
Crabapples are less than 2" in diameter (and very sour), so humans don't usually eat this variety of apple. However, they are very popular trees because of the beautiful flowers they grow, and their fallen fruit attracts animals.
Apple scab
The Morton Arboretum has over 140 crabapple trees on its grounds. This is one of many species of crabapple (Malus spp.) found in the Morton Arboretum. The last crabapple left on this tree that appears to be affected by apple scab, which is a fungal infection. It is named for the dark patches it creates on the crabapple skin and can cause trees to drop both leaves and fruit prematurely. The majority of the other crabapple trees in the arboretum still had leaves and fruit.
Crabapples are less than 2" in diameter (and very sour), so humans don't usually eat this variety of apple. However, they are very popular trees because of the beautiful flowers they grow, and their fallen fruit attracts animals.