Turfgrass Disease Control and Resistance Management
Disease
Pathogen
Host CB, Poa
Season May-October
Algea (not a true disease)
Anthracnose
Colletotrichum cereale
Poa, CB
April-November
Bentgrass Dead Spot
Ophiosphaerella agrostis
CB
May-October
Brown Patch
Rhizoctonia solani
PR, TF, CB
June-September May-September
Brown Ring Patch (Waitea)
Waitea circinata
Poa, CB
Copper Spot
Microdochium sorghi
CB
July-August
Dollar Spot
Clarireedia jacksonii
All Turfgrasses All Turfgrasses
April-November
Fairy Ring
complex of basidiomycete fungi
All year
Grey Leaf Spot
Pyricularia grisea
PR, TF
July-September November-May
Grey Snow Mold
Typhula incarnata Rhizoctonia solani Ustilago striiformis
CB, Poa, PR, KB, FF
Large Patch (Zoysiagrass)
ZG; BG
April-June, September-Oct
Leaf Smuts
KB
April-November
Leaf Spot/Melting Out
Bipolaris and Drechslera Ophiosphaerella korrae
All Turfgrasses
April-October
Necrotic Ring Spot
KB, Poa, FF
March-June, September-Oct
Pink Snow Mold/Microdochium Patch
Monographella nivalis
CB, Poa, PR, KB, FF
November-May April-November June-September
Powdery Mildew
Blumeria graminis
KB
Pythium Blight
aphanidermatum/graminicola
PRG, CB, Poa, TF, FF
Pythium Root Rot
Pythium spp
All Turfgrasses
All year
Pythium Root Dysfunction
Pythium volutum,
CB, Poa
Soil temps 54-75 degrees
Red Thread
Laetisaria fuciformis
PRG, FF, TF, KBG
February-November
Rhizoctonia Leaf Spot
Waitea circinata
CB, RB
June-August
Rust
Puccinia coronata and graminis
KB, PR, TF, ZG
August-November
Slime Molds
Physarum and Fuligo spp.
All Turfgrasses
May-October
Spring Dead Spot
Ophiosphaerella herpotricha &Korrae
BG
April-July
Summer Patch
Magnaporthiopsis poae
KBG, Poa, FF
July-September April-October October-April April-September
Take-All Patch
Gaeumannomyces graminis
CB
Yellow Patch
Ceratobasidium cereale
CB, KBG, Poa
Yellow Tuft
Sclerophthora macrospora
CB, KB, Poa, PR
Poa = Annual Bluegrass; TF = Tall Fescue; PRG = Perennial Ryegrass; ZG = Zoysiagrass; BG = Bermudagrass; FF = Fine Fescue; KB = Kentucky Bluegrass; RB = Roughstalk Bluegrass; CB = Creeping Bentgrass.
Source: Chemical Control of Turfgrass Diseases 2020
UK/Rutgers/Wisconsin
(FRAC Codes)
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