Fungus diseases: If your lawn is developing areas that yellow and then turn brown, and you cannot find any of the insect pests, then you may consider the possibility of a fungus disease, particularly if you have been receiving very frequent rains. Closely examine the grass blades to see if they appear to be rotting off where they are attached to the stem. If so, then a fungus disease is a good possibility. Possible lawn fungicides to use include those having the active ingredients chlorothalonil, propiconazole, triadimefon, myclobutanil, or thiophanate-methyl Scotts Lawn Fungus Control is an example of a product that contains thiophanate-methyl. Bayer Advanced Lawn Fungus Control contains triadimefon. Fertilome Liquid Systemic Fungicide contains propiconazole, and Spectracide Immunox contains myclobutanil. Chlorothalonil-containing products are more difficult to find now, but several fungicides, such as Hi-Yield® Daconil® Fungicide, still contain chlorothalonil. Carefully follow the label directions for use on residential lawns.

Hi-Yield® Daconil® Fungicide

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