Disease Guide for Resistance Management
Fungicide Recommendations and Resistance Management
Disease
Pathogen
Host
Season May-October
Algea (not a true disease)
Creeping Bentgrass, POA POA, Creeping Bentgrass
Anthracnose
Colletotrichum Cereale
April-November
Bentgrass Dead Spot
Ophiosphaerella agrostis
Creeping Bentgrass
May-October
Brown Patch
Rhizoctonia solani
Rye, Tall Fescue, Bentgrass POA, Creeping Bentgrass
June-September May-September
Brown Ring Patch (Waitea)
Waitea circinata
Copper Spot
Microdochium sorghi
Creeping Bentgrass
July-August
Dollar Spot
Clarireedia jacksonii
All Turfgrasses All Turfgrasses Rye, Tall Fescue
April-November
Fairy Ring
complex of basidiomycete fungi
All year
Grey Leaf Spot
Pyricularia grisea
July-September November-May
Grey Snow Mold
Typhula incarnata Rhizoctonia solani Ustilago striiformis
CBG, POA, Rye, KBG, FF Zoysia, Bermudagrass
Large Patch (Zoysiagrass)
April-June, September-Oct
Leaf Smuts
Kentucky Bluegrass
April-November
Leaf Spot/Melting Out
Bipolaris and Drechslera Ophiosphaerella korrae
All Turfgrasses
April-October
Necrotic Ring Spot
KBG, POA, Red Fescue CBG, POA, Rye, KBG, FF
March-June, September-Oct
Pink Snow Mold/Microdochium Patch
Monographella nivalis
November-May April-November June-September
Powdery Mildew
Blumeria graminis
Kentucky Bluegrass
Pythium Blight
aphanidermatum/graminicola
PRG, CBG, POA, TF, FF
Pythium Root Rot
Pythium spp
All Turfgrasses
All year
Pythium Root Dysfunction
Pythium volutum,
CBG, Poa
Soil temps 54-75 degrees
Red Thread
Laetisaria fuciformis
PRG, FF, TF, KBG
February-November
Rhizoctonia Leaf Spot
Waitea circinata
CBG, Roughstalk Bluegrass
June-August
Rust
Puccinia coronata and graminis
Blue's, Rye's,TF, Zoysia
August-November
Slime Molds
Physarum and Fuligo spp.
All Turfgrasses Bermudagrass
May-October
Spring Dead Spot
Ophiosphaerella herpotricha &Korrae
April-July
Summer Patch
Magnaporthiopsis poae
KBG, POA, FF
July-September April-October October-April April-September
Take-All Patch
Gaeumannomyces graminis
Creeping Bentgrass
Yellow Patch
Ceratobasidium cereale
CBG, KBG, POA
Yellow Tuft
Sclerophthora macrospora
CBG, KBG, POA, Ryegrass
Source: Chemical Control of Turfgrass Diseases 2024
UK/Rutgers/Wisconsin
(FRAC Codes)
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