Protect Your Trees from Apple Scab: Why Prevention is Key

Apple scab is one of the most common and destructive fungal diseases affecting apple and crabapple trees in Northwest Indiana. Left untreated, this disease weakens trees over time, leading to poor fruit production, premature leaf drop, and increased vulnerability to other stressors. If you’ve noticed dark, scaly lesions on your tree’s leaves or fruit, it’s time to take action.

Crabapple almost completely defoliated by Apple Scab by mid June

The Long-Term Impact of Untreated Apple Scab

Apple scab doesn’t just cause cosmetic damage—it weakens the overall health of your tree. When infections recur year after year, defoliation becomes a chronic issue, reducing the tree’s ability to photosynthesize and thrive. This can lead to stunted growth, increased susceptibility to pests and other diseases, and ultimately, premature tree decline.

Prevention vs. Reactive Treatments: Why Timing Matters

By the time Apple Scab is visible, the tree has already been infected.

Many homeowners wait until they see visible signs of apple scab before taking action, but

by that point, the disease has already taken hold. Preventative treatments are far more effective than reactive measures. Fungicide applications in early spring, before infection begins, significantly reduce the risk of disease development. Proper pruning, improved air circulation, and sanitation measures (such as removing infected leaves) also play a crucial role in prevention.

Our Apple Scab Treatment Program

At NWI ArborCare, we specialize in protecting trees from apple scab with customized treatment plans, including:

Treatments are most effective when applied as leaf buds are opening in early spring.

• Fungicidal Treatments: Timed applications to prevent apple scab from taking hold.

• Soil Health & Nutrition Management: Strengthening your tree’s natural defenses through proper fertilization.

• Pruning & Airflow Management: Reducing disease spread by improving air circulation within the canopy.

• Seasonal Monitoring: Ongoing inspections to catch early signs of infection and adjust treatment as needed.

Act Now: The Best Time to Treat Apple Scab

The most effective time to prevent apple scab is in early spring, before symptoms appear. Once infection sets in, managing the disease becomes much more difficult. If your trees have struggled with apple scab in previous years, now is the time to start a proactive treatment plan.

Don’t let apple scab weaken your trees—contact NWI ArborCare today to schedule a consultation and protect your landscape for seasons to come.

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