Leaves Falling from Crabapple Tree?

Apple Scab Disease, a Common Issue for Davison Homeowners

Apple scab, caused by a fungus named Venturia inaequalis, is a widespread problem for both apple and crabapple trees, frequently affecting Genesee County residential landscapes. This disease infects crabapple and apple trees in the spring when cool, damp conditions create favorable conditions for fungal growth.

On crabapple trees, apple scab appears as dark, olive-green spots on the upper side of the leaves. Over time, these lesions may turn brown or black, causing the leaves to curl, distort, or fall off prematurely. In severe cases, the disease can lead to significant defoliation, weakening the tree and impacting its overall appearance and health.

Common Symptoms of Apple Scab Disease:

• Fungal lesions on the leaves
• Reduced flowering
• Premature leaf drop, typically by mid-summer
• Early defoliation of crabapple tree
• Increased vulnerability to secondary diseases and insect damage
• Branch dieback and long-term decline

To control apple scab, fungicide applications should begin before the tree is infected in the spring. As the tree continues to produce new leaves, additional treatments are necessary to protect them. Usually, three applications provide effective control for crabapple trees in residential areas.

Apple scab isn’t just a cosmetic issue—it can severely affect the health of your crabapple tree if not managed properly. If you missed the spring window for starting fungicide treatments, there are still a couple of options you can do to help your tree.

Deep-root fertilization will make sure there are nutrients in the soil and available to the tree. This treatment can help the tree stay healthy for the rest of the growing season.

Tree trimming to thin out excess interior growth can help reduce infection next season and improve the trees’ appearance now. By reducing interior growth the leaves will dry off quicker after a rainfall, allowing less time for fungal spores to infect leaves.

Reach Out to an Owen Tree & Lawn Certified Arborist Today for Professional Assistance!