Leaf Spot & Melting-Out Description:

Leaf spot and melting-out are turfgrass fungal diseases that can cause indefinite yellowing and thinning of grass, as well as large patches of dead turfgrass.


Cool-season turfgrasses, especially Kentucky bluegrass, are most susceptible to leaf spot and melting-out diseases. A landscape professional can tell you which turfgrass cultivars are most disease-resistant in your growing region.

Biology & Symptoms:

Prolonged periods of cool to warm and humid conditions can lead to these diseases, although the melting-out phase is often not evident until it’s warm and dry. Look for a yellow to rust-colored cast over all or part of the lawn, as well as yellow-brown spots with purple-black borders on grass leaves.


Follow a preventive maintenance program as prescribed by a certified arborist, including applying fungicides if appropriate. To help limit the severity of the disease, seed or sod with disease-resistant cultivars, remove excess thatch, never overfertilize and try not to water in the early evening.

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We pride ourselves at Davey Tree on providing prompt, professional and personalized service from certified arborists that live, work and engage in your community. Contact one of our Davey Tree specialists for your residential needs.

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