Keep Lawns Green and Healthy All Season Long

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Gardening expert Melinda Myers shares strategies for preventing and managing lawn problems and diseases.

Brown Patch typically occurs when temperatures and humidity rise and grass remains wet for long periods of time.

A healthy lawn is the best defense against lawn diseases and other problems, but when the weather favors the disease more than the lawn, problems can occur. Reduce the risk of disease by keeping lawns healthy with these strategies from gardening expert and author Melinda Myers.

Mow high to encourage deeply rooted grass that is more drought tolerant and resistant to disease problems. Water early in the day so the grass leaves, blades, dry quickly and less water is lost to evaporation.

Apply the right type and amount of fertilizer at the proper time to limit the risk of disease. Regular fertilization, three to four times per year, encourages better results since most soils do not contain the essential nutrients for optimum growth.

Avoid high nitrogen quick release fertilizers that promote lush succulent growth that is more susceptible to disease. Instead use a low nitrogen slow release fertilizer like Milorganite that promotes steady growth that’s more drought tolerant and resistant to disease.

Take a closer look at the lawn if a disease problem is suspected. As the snow recedes, watch for circular gray to straw colored areas of matted grass caused by snow mold. Use a leaf rake to lift the matted grass, remove leaf litter and reduce the risk of this disease. Keep mowing throughout the fall and avoid heavy fertilization late in the year.

Monitor lawns for Brown Patch when temperatures and humidity rise and grass remains wet for long periods of time. Infected lawns will have somewhat circular patches of thin light brown grass. Look for white cottony strands of fungal mycelium early in the morning on dew covered lawns. Check grass blades for small irregular tan spots with dark brown borders on the individual grass blades. Avoid heavy fertilization with fast release fertilizer in early spring and summer.

Look for dollar size to 6” diameter spots of bleached or light tan grass if Dollar Spot is suspected. Infected leaves have white lesions with reddish tan margins that often resemble an hourglass. Over and under fertilization, drought, water on the grass blades for extended time and mowing too low all increase the risk of this disease.

Closely examine lawns with a reddish hue to confirm the presence of rust disease. Rust infected lawns are covered with an orange or yellowish powder, the fungal spores, that can leave an orange residue on shoes. Newly seeded and lawns weakened by inadequate fertilization and drought are most susceptible.

Stay alert for leaf spot diseases that can attack lawns. Avoid excess fertilization and watering late afternoon and evenings.

Once a disease is discovered, visit Milorganite.com for more detailed information and photos to help with diagnosis. Correct lawn care practices to speed recovery and avoid problems in the future. Proper care and reseeding dead areas with disease-resistant grass varieties is usually enough to manage the disease. Be sure a fungicide is needed before applying. These chemicals are costly, the results can be disappointing and when used improperly they can be harmful to pollinators and the environment.

Further speed recovery with a change in mowing habits. Continue to mow high but cut the healthy portions of the lawn first. Then cut the grass in the diseased areas. Once done, use a disinfectant to clean the mower blades then rinse with clear water. This along with collecting and disposing of clippings from the diseased areas of the lawn reduces the risk of spreading the disease the next time it’s mowed.

Provide proper care and monitor the lawn throughout the growing season. Discovering problems early means better results with less effort.

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Diana Paul
Melinda Myers LLC
+1 (414) 771-1888
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