Lawn Care

Treating Ascochyta Leaf Blight in Rochester Hills Lawns

Noah Dolce, Lawn Care Specialist | Jun 14, 2026

Tags: General, Landscape, Lawn Aeration, Lawn Disease, Lawn Fertilization, Lawn Maintenance

Supporting image for blog post: Treating Ascochyta Leaf Blight in Rochester Hills Lawns

Ascochyta lawn fungus. | Ned Tisserat, Colorado State University, Bugwood.org

Ascochyta leaf blight is an annual lawn disease that we often see affecting grass in Rochester Hills, Michigan, especially during the humid summer months. The disease is caused by the Ascochyta fungus, which thrives in damp, warm conditions. This fungus leads to irregular brown patches on the grass of varying sizes, eventually causing the affected areas to turn yellow or brown. Sometimes this lawn disease will follow along the mowing pattern in the lawn.

To treat Ascochyta leaf blight in Rochester Hills, homeowners should focus on proper lawn care and moisture management. Overwatering is a key contributor to fungal growth, so water your lawn deeply but infrequently, allowing the grass to dry during the day. Early morning watering is the best practice for reducing moisture retention overnight.

Fungicide applications are rarely necessary to control Ascochyta leaf blight. The disease often shows up when hot, humid weather follows a heavy rain. By the time the disease expresses itself on the lawn and is diagnosed the general weather pattern changes enough that the lawn will begin normal growth and the disease will disappear.

Regular lawn maintenance such as proper mowing frequency, mowing at the appropriate height and aerating your lawn to improve maintain root health will help reduce the likelihood of fungal outbreaks. Aerating promotes soil health and better water drainage, preventing excess moisture from lingering on the grass.

By following these tips, residents of Rochester Hills can keep their lawns healthy and free from Ascochyta leaf blight. If you have concerns about disease in your lawn contact Owen Tree and Lawn Care at 800-724-6680.

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