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Southern Turfgrass Diseases

Southern Turfgrass Diseases. Bermudagrass leaf spot. Stolon Rot of St. Augustinegrass. Spring dead spot in bermudagrass. Turfgrass Problems. Physiological Cultural Insect Large Animal (People) Disease. Disease Diagnosis. Host Time Symptoms Pathogen ID. Host. Environment. Disease.

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Southern Turfgrass Diseases

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  1. Southern Turfgrass Diseases

  2. Bermudagrass leaf spot

  3. Stolon Rot of St. Augustinegrass

  4. Spring dead spot in bermudagrass

  5. Turfgrass Problems • Physiological • Cultural • Insect • Large Animal (People) • Disease

  6. Disease Diagnosis • Host • Time • Symptoms • Pathogen ID

  7. Host Environment Disease Pathogen

  8. Pathogens • Fungi • Nematodes • Viruses

  9. Brownpatch in zoysiagrass lawn

  10. Brownpatch in St. Augustinegrass

  11. Brownpatch in bermudagrass lawn

  12. Brownpatch symptoms distinct boundary between healthy and diseased grass

  13. Brownpatch symptoms showing rotted tissue where shoot attaches to stem

  14. Closeup showing rotted shoot tissue

  15. Brownpatch in St. Augustinegrass Rate of A.I./ *Ratings for Brownpatch Activity Fungicide1,000 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

  16. Bermudagrass leaf spot symptoms

  17. Closeup of bermudagrass leaf spot symptoms

  18. Dollar spot in bermudagrass

  19. Closeup of dollar spot symptoms

  20. Closeup of dollar spot symptoms in early morning before sunlight

  21. Dollar spot symptoms on leaf blades

  22. St. Augustine decline symptoms (SAD)

  23. St. Augustine decline symptoms (SAD)

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

  25. St. Augustine decline

  26. Pythium blight in ryegrass

  27. Spring Dead Spot • Bermudagrass • Winter

  28. Spring dead spot in bermudagrass

  29. Spring dead spot in bermudagrass

  30. Rhizoctonia mycelium Causal organism for brownpatch

  31. Helminthosporium

  32. Take-all patch fungal organism

  33. Pythium blight Mycelium and spores

  34. Lightning injury on golf green

  35. Gray leaf spot in St. Augustine

  36. Gray leaf spot in St. Augustine

  37. Gray leaf spot in St. Augustine

  38. Rust in a zoysia lawn

  39. Nematodes in bermudagrass

  40. Nematodes • All grasses (Bermudagrass, zoysiagrass) • ³ 55º F - Moist

  41. Nematode injury on a golf green

  42. Bermudagrass decline

  43. Bermuda Decline

  44. Bermuda decline Early symptoms

  45. Bermuda decline

  46. Bermuda decline Note absence of roots

  47. Take-all patch in bermuda

  48. Take-all patch in bermuda

  49. Take-all patch in St. Augustine

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