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Summary of Disease Management Strategies

Summary of disease management strategies
Diseases and pathogens Environmental management and resistant species/cultivars Fungicides
¹ Also available as seed treatment.
² Labeled only for red thread.
³ Controls only red thread.
Anthracnose
(Colletotrichum graminicola)
Provide adequate fertility (especially nitrogen), avoid excess irrigation, improve drainage, aerate to relieve compaction, and improve air circulation when disease is not active. Annual bluegrass is particularly susceptible in Pennsylvania, whereas creeping bentgrass is generally resistant.
Azoxystrobin
Chlorothalonil
Fenarimol
Fludioxonil
Myclobutanil
Polyoxin D
Propiconazole
Pyraclostrobin
Tebuconazole
Thiophanate methyl
Triadimefon
Trifloxystrobin
Brown patch
(Rhizoctonia solani)
Avoid excess nitrogen and irrigation in summer. Creeping bentgrass, perennial ryegrass, and tall fescue are the most susceptible. Kentucky bluegrass and fine fescues are the most resistant species.

Somewhat resistant perennial ryegrass cultivars: Prizm, Affinity, APM, Morning Star, Bright Star, Prelude II, Assure, Wind Star, Riviera II, Mulligan, and Seville.
Azoxystrobin
Chlorothalonil
Fenarimol
Fludioxanil
Flutolanil
Iprodione
Mancozeb
Myclobutanil
Polyoxin D
Propiconazole
Pyraxlostrobin
Thiophanate methyl
Thiram
Triadimefon
Trifloxystrobin
Vinclozolin
Damping-off
(species of Fusarium,
Pythium,
and Rhizoctonia)
Avoid excessive seeding rates and excess nitrogen. Do not seed in summer unless absolutely necessary. Avoid overabundance of mulch. No resistant species/cultivars known. Captan¹
Banol
Ethazole (Koban)
Mefanoxam¹
Dollar spot
(Sclerotinia homoeocarpa)
Avoid nitrogen deficiency, drought stress, and night watering. Remove dew in early morning. Creeping bentgrass, annual bluegrass, and Kentucky bluegrass particularly susceptible. Tall fescue is quite resistant.

Somewhat resistant creeping bentgrass cultivars: Penn A-1, L-93, Cato, and Declaration

Somewhat resistant Kentucky bluegrass cultivars: Preakness, Princeton 104, NuStar, Unique, Banff, A-34, Eagleton, and many others
Boscalid
Chlorothalonil
Fenarimol
Iprodione
Mancozeb
Myclobutanil
Propiconazole
Thiophanate methyl
Thiram
Triadimefon
Vinclozolin
Fairy rings
(basidiomycete fungi)
Mask symptoms by fertilizing with nitrogen and/oriron. Thoroughly water rings to avoid drought. Core aeration andapplication of wetting agents may help wetting of affected soils. Noresistant species/cultivars available. Azoxystrobin
Flutolanil
Polyoxin D
Pyraclostrobin
Triadmefon
Gray snow mold
(Typhula incarnata)
Avoid piling snow in sensitive turfed areas. Remove tree leaves from turf before snow cover. Rake disease damaged areas in spring to break up matted grass. Creeping bentgrass, perennial ryegrass and tall fescue are very susceptible. In problem lawns substitute Kentucky bluegrass or fine fescues for perennial ryegrass or tall fescue. Azoxystrobin
Chloroneb
Chlorothalonil
Cyproconazole
Ethazole
Fenarimol
Flutolanil
Iprodione
Propiconazole
Triadimefon
Thiram
Vinclozolin
Leaf spot/melting out
(Bipolaris, Drechlera, and Exserohilum spp.)
Avoid excess use of nitrogen in early spring. Avoid using common types of Kentucky bluegrass.

Resistant Kentucky bluegrass cultivars: Ascot, Princeton104, Eclipse, Unique, Alpine, SR 2000, Bartita, Apex, Touchdown,Liberty, and Barblue, and many others.
Azoxystrobin
Chlorothalonil
Fludioxanil
Iprodione
Mancozeb
Trifloxystrobin
Vinclozolin
Necrotic ring spot
(Ophiosphaerella korrae)
Use cultural practices that reduce turf stress, such as irrigation, when turf undergoes drought stress and raising mowing heights to 2 inches or more. Overseed affected areas with perennial ryegrass. Tall fescue is also resistant to necrotic ring spot. Azoxystrobin
Fenarimol
Iprodione
Myclobutanil
Propiconazole
Thiophanate methyl
Pink snow mold/Microdochium patch
(Microdochium nivale)
Avoid piling snow in sensitive turfed areas. Continue mowing turf in fall until growth ceases. Do not apply excessive amounts of nitrogen in mid-fall. Creeping bentgrass and perennial ryegrass are more susceptible than Kentucky bluegrass and fine fescues. Azoxystrobin
Chlorothalonil
Fenarimol
Fludioxanil
Iprodione
Mancozeb
Myclobutanil
Propiconazole
Pyraclostrobin
Thiophanate methyl
Thiram
Triadimefon
Trifloxystrobin
Vinclozolin
Powdery mildew
(Erysiphe graminis)
Do not grow Kentucky bluegrass in shaded areas. Prune trees to allow more light to reach turf. Use fine fescues or shade-tolerant ground covers in shaded areas. Fenarimol
Myclobutanil
Propiconazole
Triadimefon
Pythium blight
(Pythium aphanidermatum)
Avoid excessive nitrogen and irrigation in hot, humid weather. Improve drainage and air circulation in areas where Pythium blight is a problem. Perennial ryegrass and creeping bentgrass are particularly susceptible to Pythium blight. Kentucky bluegrass is less susceptible to this disease. Azoxystrobin
Chloroneb
Ethazole
Fosetyl-Aluminum
Mefenoxam
Metalaxyl
Potassium phosphite
Propamocarb
Pyraclostrobin
Red thread
(Laetisaria fuciformis)
Pink patch
(Limonomyces roseipellis)
Avoid nitrogen deficiencies, especially on perennial ryegrass and fine fescues. Although Kentucky bluegrass and tall fescue are susceptible to these diseases, the resulting damage is usually not as severe as it is in perennial ryegrass and the fine fescues.

Somewhat resistant perennial ryegrass cultivars: Regal, Legacy, Sherwood, Derby Supreme, Loretta, Gettysburg, Assure, and Pinnacle
Azoxystrobin²
Chlorothalonil
Cyproconazole
Fenarimol
Flutolanil
Iprodione
Mancozeb
Myclobutanil
Polyoxin D
Propiconazole
Pyraclostrobin
Thiophanate methyl³
Triadimefon
Vinclozolin
Rust
(Puccinia spp.)
Avoid nitrogen deficiencies and moisture stress in late summer/ early fall. Applications of nitrogen fertilizer and irrigation at the first sign of infection will help reduce disease severity. Perennial ryegrass and Kentucky bluegrass are very susceptible. The fine fescues and tall fescue are quite resistant to most foliar rust diseases. Azoxystrobin
Chlorothalonil
Cyproconazole
Fenarimol
Mancozeb
Myclobutanil
Propiconazole
Pyraclostrobin
Triadimefon
Trifloxystrobin
Slime molds
(Mucilago, Physarum, Fuligo spp.)
Remove spores by mowing, brushing, raking, or irrigating the turf. Fungicides not required.
Summer patch
(Magnaporthe poae)
Use cultural practices that promote root growth. Increase aeration and improve drainage on compacted and poorly drained soils. Raise mowing heights of Kentucky bluegrass in summer if mowed below 2 inches in height. Kentucky bluegrass, annual bluegrass, and fine fescues are susceptible. Perennial ryegrass, tall
fescue, and creeping bentgrass are resistant.
Azoxystrobin
Fenarimol
Myclobutanil
Propiconazole
Thiophanate methyl
Triadimefon
Trifloxystrobin
Take-all patch
(Gaeumannomyces graminis)
Only a problem on bentgrasses. Use acidifying fertilizers or sulfur to lower thatch and soil pH. Avoid applications of lime where take-all patch is a problem. No resistant cultivars are known. Azoxystrobin
Fenarimol
Triadimefon
Yellow patch
(Rhizoctonia cerealis)
Improve surface drainage and avoid excessive applications of nitrogen. Azoxystrobin
Chlorothalonil
Fludioxanil
Flutolanil
Iprodione
Mancozeb