Fungal lawn diseases strike fast. Recognize the signs, act quickly, and cultural practices prevent recurrence.
Looks like: Silver-dollar-sized straw/brown patches. Hosts: Kentucky bluegrass, bentgrass, Bermuda. Triggers: Humidity, drought, low nitrogen. Fix: Aerate, morning deep watering, dethatch, regular fertilizing. Fungicides: benomyl, anilazine, thiophanate.
Looks like: Orange/rust powder on blades (rubs off on tissue). Hosts: Ryegrass, Kentucky bluegrass. Triggers: Dew, shade, compaction, low fertility. Fix: Aerate, morning water, reduce shade, frequent mow with bagging, fertilize. Fungicides: triadimefon, anilazine.
Looks like: Pinkish-red threads binding blades; grass browns. Hosts: Fescue, ryegrass, Kentucky bluegrass. Triggers: Cool, moist weather. Fix: Aerate, dethatch. Fungicide: chlorothalonil.
Root cause: mowing too low, improper watering, under-fertilizing. Good culture = disease resistance.
Article by Jack Greenwood.
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