Southern Turfgrass Diseases

Southern Turfgrass DiseasesSouthern Turfgrass Diseases

Bermudagrass leaf spot

Stolon Rot ofStolon Rot ofSt. AugustinegrassSt. Augustinegrass

Spring dead spot in bermudagrass

Turfgrass ProblemsTurfgrass Problems

Physiological Cultural Insect Large Animal (People) Disease

Physiological Cultural Insect Large Animal (People) Disease

Disease DiagnosisDisease Diagnosis

Host

Time

Symptoms

Pathogen ID

Host

Time

Symptoms

Pathogen ID

Envi

ronm

ent

Envi

ronm

entH

ostH

ost

PathogenPathogen

DiseaseDisease

PathogensPathogens

Fungi

Nematodes

Viruses

Fungi

Nematodes

Viruses

Brownpatch in zoysiagrass lawnBrownpatch in zoysiagrass lawn

Brownpatch in St. Augustinegrass

Brownpatch in bermudagrass lawnBrownpatch in bermudagrass lawn

Brownpatch symptoms distinct boundary between Brownpatch symptoms distinct boundary between healthy and diseased grasshealthy and diseased grass

Brownpatch symptoms showing rotted tissueBrownpatch symptoms showing rotted tissuewhere shoot attaches to stemwhere shoot attaches to stem

Closeup showing rotted shoot tissueCloseup showing rotted shoot tissue

Brownpatch in St. AugustinegrassBrownpatch in St. Augustinegrass

Rate of A.I./ *Ratings for Brownpatch Activity

Fungicide 1,000 sq. ft. 11/25/85 11/11/86 11/6/97 11/30/88 3/9/89

PCNB 12 oz. 1.0 1.0 1.3 1.0 1.3

Benomyl 2 oz. 7.3 6.7

Chipco 26019 2 oz. 4.0 5.2 5.3 2.0 4.2

Daconil 4 oz. 8.0 5.2 4.0

Prostar 2 oz. 1.0 1.7 1.5 3.5

Banner 2 oz. 2.0 3.5

Check 9.0 8.0 8.3 4.0 8.0

Rate of A.I./ *Ratings for Brownpatch Activity

Fungicide 1,000 sq. ft. 11/25/85 11/11/86 11/6/97 11/30/88 3/9/89

PCNB 12 oz. 1.0 1.0 1.3 1.0 1.3

Benomyl 2 oz. 7.3 6.7

Chipco 26019 2 oz. 4.0 5.2 5.3 2.0 4.2

Daconil 4 oz. 8.0 5.2 4.0

Prostar 2 oz. 1.0 1.7 1.5 3.5

Banner 2 oz. 2.0 3.5

Check 9.0 8.0 8.3 4.0 8.0

Bermudagrass leaf spot symptoms

Closeup of bermudagrass leaf spot symptomsCloseup of bermudagrass leaf spot symptoms

Dollar spot in bermudagrassDollar spot in bermudagrass

Closeup of dollar spot symptomsCloseup of dollar spot symptoms

Closeup of dollar spot symptoms in early morning before sunlight

Dollar spot symptoms on leaf blades

St. Augustine decline symptoms (SAD)St. Augustine decline symptoms (SAD)

Healthy leaf (left) – SAD (middle) –Healthy leaf (left) – SAD (middle) –Iron chlorosis (right)Iron chlorosis (right)

St. Augustine declineSt. Augustine decline

Pythium blight in ryegrass

Spring Dead SpotSpring Dead Spot

Bermudagrass

Winter

Bermudagrass

Winter

Spring dead spot in bermudagrass

Spring dead spot in bermudagrassSpring dead spot in bermudagrass

Rhizoctonia myceliumRhizoctonia myceliumCausal organism for brownpatchCausal organism for brownpatch

HelminthosporiumHelminthosporium

Take-all patch fungal organismTake-all patch fungal organism

PythiumPythium blight blightMycelium and sporesMycelium and spores

Lightning injury on golf greenLightning injury on golf green

Gray leaf spot in St. AugustineGray leaf spot in St. Augustine

Rust in a zoysia lawnRust in a zoysia lawn

Nematodes in bermudagrassNematodes in bermudagrass

NematodesNematodes

All grasses

(Bermudagrass, zoysiagrass)

55º F - Moist

All grasses

(Bermudagrass, zoysiagrass)

55º F - Moist

Nematode injury on a golf greenNematode injury on a golf green

Bermudagrass declineBermudagrass decline

Bermuda DeclineBermuda Decline

Bermuda declineBermuda declineEarly symptomsEarly symptoms

Bermuda declineBermuda decline

Bermuda declineBermuda declineNote absence of rootsNote absence of roots

Take-all patch in bermudaTake-all patch in bermuda

Take-all patch in St. AugustineTake-all patch in St. Augustine

Fairy RingsFairy Rings

All grassesAll grasses

Fairy ring fungus in lawnFairy ring fungus in lawn

RhizoctoniaRhizoctonia blight in zoysia blight in zoysia

NigrosporiaNigrosporia stolon rot stolon rot

Southern Turfgrass Diseases

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