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Turfgrass Diseases

Turfgrass Diseases. Turfgrass Disease. Disease : normal development disturbed; reduces value. Turfgrass Disease. Symptom : visible reaction to a disease. Turfgrass Disease. Abiotic : non-living causes. Turfgrass Disease. Abiotic : Herbicide. Turfgrass Disease. Abiotic : Scalping.

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Turfgrass Diseases

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  1. Turfgrass Diseases

  2. Turfgrass Disease • Disease: normal development disturbed; reduces value

  3. Turfgrass Disease Symptom: visible reaction to a disease

  4. Turfgrass Disease Abiotic: non-living causes

  5. Turfgrass Disease Abiotic: Herbicide

  6. Turfgrass Disease Abiotic: Scalping

  7. Turfgrass Disease Abiotic: Dull Mower

  8. Turfgrass Disease Abiotic: Nutrient

  9. Turfgrass Disease Abiotic: Fertilizer

  10. Turfgrass Disease Abiotic: Cold

  11. Turfgrass Disease Biotic: living organisms, infectious • Fungus…

  12. Environment Temperature • Fungus in the host unnoticed until the host is under stress

  13. Environment Moisture • Rain • Dew • Irrigation • Poor drainage is critical

  14. CULTURAL CONTROL DRAINAGE! • Most important

  15. CULTURAL CONTROL Disease-resistant turf • Correct species or resistant cultivar

  16. CULTURAL CONTROL Diversify the genetic resistance • Blends: mixing cultivars of a species • Mixes: mixing species of turf

  17. CULTURAL CONTROL Proper turfgrass establishment • At least 6” of topsoil • Properly graded with good drainage

  18. CULTURAL CONTROL Mowing • Mow within correct height • Good cut

  19. CULTURAL CONTROL Irrigation • Avoid irrigating in the evening • Early morning to knock off the dew • Deeply and infrequently

  20. CULTURAL CONTROL Nutritional status • Influences diseases • Excessive N favors Pythium and Brown Patch

  21. CULTURAL CONTROL Nutritional status • Deficient N favors Dollar Spot and Rust

  22. CULTURAL CONTROL Nutritional status • Potassium helps environmental stress • Use K in a the same proportions as N

  23. CULTURAL CONTROL Thatch control • Thatch can support some diseases

  24. BIOLOGICAL CONTROL None used commercial with great success

  25. FUNGICIDE Preventative: applied prior to favorable conditions at lower rates Curative: applied after symptoms have occurred at higher rates

  26. FUNGICIDE Contacts: form preventative coating

  27. FUNGICIDE Contacts • New leaves have no protection • Fungicide degrades under irrigation, sunlight, mowing • Effective for 7 to 14 days

  28. FUNGICIDE Contacts • Broad spectrum controls mostly foliar diseases and not root/crown diseases

  29. FUNGICIDE Penetrant • Protective and curative • Effective for 15 to 30 days

  30. FUNGICIDE Penetrant • Specific MOA, develops resistant strains • Some chemicals are mixes to take advantage of both the contact and systemic effects

  31. Brown Patch Causal Agent: Rhizoctonia

  32. Brown Patch Hosts: zoysia, St. Augustine, centipede

  33. Brown Patch Favorable Conditions: • Spring and fall months • Start watching in August

  34. Brown Patch Symptoms: • Smoke ring on greens • No leaf spots, leaf sheath rot at base

  35. Brown Patch Symptoms: • Shoots pull off from stolons easily • Roots not affected

  36. Brown Patch Controls: • Avoid excess N • Improve drainage

  37. Gray Leaf Spot Host: St. Augustine

  38. Gray Leaf Spot Favorable Conditions: • Mid-July • Shade

  39. Gray Leaf Spot Symptoms: • All aboveground plant parts

  40. Gray Leaf Spot Control: • Collect clippings • Raise mowing height

  41. Dollar Spot Host: bermuda, zoysia

  42. Dollar Spot Favorable Conditions: • Warm weather, 60 to 80 F • Low N • Thatch

  43. Dollar Spot Symptoms: • Leaf lesions band across leaf with purple border

  44. Dollar Spot Symptoms: • White patches in dew • fungus

  45. Dollar Spot Control: • Apply N

  46. Dollar Spot Control: • Apply N

  47. Fairy Rings Causal Agent: fungi

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