Apple Scab Control for Crabapples in Flint

Why Are My Leaves Falling from My Crabapple Tree? Apple Scab Disease, A Common Issue for Homeowners in Flint

Apple scab, caused by the fungus Venturia inaequalis, is a common concern for homeowners with crabapple trees in Flint, Michigan. This disease flourishes in cool, damp spring conditions, which create the ideal environment for the fungus to grow and spread.

On crabapple trees, apple scab typically presents as dark, olive-green spots on the upper surface of the leaves. As the disease progresses, these spots turn brown or black, causing the leaves to curl, distort, or drop prematurely. In more severe cases, apple scab can result in significant defoliation, weakening the tree and detracting from its appearance, and in extreme situations, it can even lead to the death of the tree over time.

Common Symptoms of Apple Scab Disease:

• Dark fungal spots or lesions on the leaves
• Reduced flowering or fewer blossoms
• Premature leaf drop, often by mid-summer
• Early defoliation, affecting the tree’s overall health
• Increased susceptibility to pests and secondary diseases due to the tree's weakened condition
• Gradual branch dieback and ongoing decline

To manage apple scab, fungicide applications should be made early in the spring, before the fungus begins to infect the tree. Additional treatments will be required as new leaves begin to grow. Typically, three treatments throughout the season will offer effective control for apple scab on crabapple trees in residential yards.

While apple scab may initially seem like a cosmetic problem, if left untreated, it can have serious long-term effects on the health of your crabapple tree, making it more vulnerable to additional issues. Regular care and maintenance are essential to ensure your tree stays healthy and resilient.

If your crabapple has had apple scab in the past, or you think it might have apple scab now, contact an ISA Certified Arborist from Owen Tree & Lawn Care for a free inspection.