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Root Diseases

Root diseases can greatly harm lawns, but cultural practices that enhance root growth (such as core aeration, improved drainage, and higher mower heights) will reduce the effects of these diseases.

DiseaseNotes
Necrotic ring spotTry brief mid-day irrigation in hot weather, use resistant cultivars.
Pythium root rotImprove drainage, raise mowing height
Summer patchMaintain 5.8 – 6.0 soil pH in root zone, raise mowing height in warm weather.
Take-all patchMaintain 5.8 – 6.0 soil pH in root zone, most common in newly planted bentgrass.

Foliar Disease

These diseases all begin with infection of the leaf blades. Minimize the time water remains on leaf blades through proper irrigation timing and pruning of landscape plants for air movement.

Diseases that generally worsen under low nitrogen conditions:

DiseaseNotes
AnthracnoseReduce compaction, raise mowing height
Dollar spotReduce compaction, raise mowing height
Red threadReduce compaction, irrigate
RustReduce compaction, irrigate

Diseases that generally worsen under high nitrogen conditions:

DiseaseNotes
Brown patchRaise mowing height
Snow Molds
Fusarium patch (pink)
Typhula blight (gray)
Allow turf to go dormant, remove snow where practical, and avoid lime appl.’s where fusarium is a problem.
Leaf spotsImprove surface drainage and air circulation
Yellow-patch (cool-season brown patch)Improve drainage
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