New Tools for Turf Disease Management in the Landscape

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Lane Tredway
Summer Green Road Show
Raleigh, NC
August 17, 2011

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New Tools for Turf Disease Management in the Landscape

  1. 1. New Tools for Turf Disease Management in the Landscape Lane Tredway Associate Professor and Extension Specialist Department of Plant Pathology North Carolina State University
  2. 2. Turf diseases are stress-induced
  3. 3. Turf diseases are stress-induced
  4. 4. Turf diseases are stress-induced
  5. 5. Many diseases appear similar from a distance
  6. 6. Identification of the affected turf species is essential foraccurate disease diagnosis Tall fescue • ridged upper leaf surface Kentucky bluegrass • smooth upper leaf surface
  7. 7. Each Turf SpeciesHas Unique ProblemsTall Fescue • brown patch, gray leaf spot, Pythium blightKentucky bluegrass • dollar spot, summer patch, Pythium blight, rust, powdery mildew
  8. 8. Symptoms: change in the appearance of the plantStand Symptoms • a change in the appearance of the turf, evident from a distance Plant Symptoms • a change in the appearance of the plant
  9. 9. Signs: evidence of the presence of a pathogen mycelium sclerotia Pythium blight red thread
  10. 10. turfpathology.org: How to follow along... turfpathology.org facebook.com/turfpathology twitter.com/ncturfpathology feeds.feedburner.com/turfpathology
  11. 11. Disease Diagnosis Utility
  12. 12. Disease Diagnosis Utility
  13. 13. Disease Diagnosis Utility
  14. 14. Disease Diagnosis Utility
  15. 15. Disease Diagnosis Utility
  16. 16. Disease Management Utility
  17. 17. Disease Management Utility
  18. 18. Disease Management Utility
  19. 19. Disease Management Utility
  20. 20. Rhizoctonia diseases are the most common anddestructive in landscape turfgrasses. brown patch of tall fescue large patch of zoysiagrass caused by Rhizoctonia solani caused by Rhizoctonia solani
  21. 21. QoI and DMI Fungicides for Rhizoctonia control QoI Fungicides DMI Fungicides Compass Bayleton Disarm Banner Heritage Eagle Insignia Torque Tourney QoI + DMI Combinations Trinity Armada Disarm M Headway
  22. 22. The QoI fungicides have revolutionized Rhizoctonia control
  23. 23. QoI Fungicides: A Growing Chemical Class • Heritage (1996) • Compass (1999) • Insignia (2004) • Disarm (2008)
  24. 24. Fungicide Prices: What do they mean? Product Cost per lb Heritage $ 365 Compass $ 300 Banner Maxx $289 (gal) Bayleton $ 81 Eagle $ 73 ProStar $ 50 SysStar $ 43 3336 $ 22 ConSyst $ 12
  25. 25. Brown patch control in tall fescue, Charlotte, 2003. Heritage (0.2 oz) Heritage (0.1 oz) Compass (0.25 oz) Compass (0.15 oz) Insignia (0.9 oz) Insignia (0.5 oz) Banner Maxx (2 oz) Bayleton (1 oz) Eagle (0.6 oz) Untreated 0 20 40 60 80 Brown Patch Incidence (%)
  26. 26. Fungicide Recommendations for Brown Patch Control Recommended Recommended Product $/acre/day Rate (/1000 ft2) Interval (days) Disarm 0.18 fl oz 28 $5 Heritage 50WG 0.2 oz 28 $7 Heritage TL 1 fl oz 28 $7 Compass 0.2 oz 21 $10 Insignia 0.7 oz 28 $10 ProStar 2.2 oz 28 $10
  27. 27. QoI and DMI Fungicides for Rhizoctonia control QoI Fungicides DMI Fungicides Compass Bayleton Disarm Banner Heritage Eagle Insignia Torque Tourney QoI + DMI Combinations Trinity Armada Disarm M Headway
  28. 28. Brown patch control in tall fescue, Raleigh, 2009. 15 Heritage TL (1 oz) Tourney (0.37 oz) Trinity (2 oz) Untreated 11.25 Brown Patch Incidence (%) 7.5 3.75 0 19-Jun 26-Jun 7-Jul 29-Jul 3-Aug Treatments applied on 8 Jun, 7 Jul, and 13 Aug
  29. 29. DMI + QoI combination products control the mostimportant landscape diseases
  30. 30. QoI + DMI Products for Landscape TurfHeadway azoxystrobin + propiconazole (Heritage + Banner)Armada trifloxystrobin + triadimefon (Compass + Bayleton)Disarm M fluoxastrobin + myclobutanil (Disarm + Eagle)
  31. 31. Brown patch control in tall fescue, 2004 Heritage (0.2 oz, 28 day) Compass (0.25 oz, 28 day) Armada (0.6 oz, 21 day) Armada (1.2 oz, 21 day) Armada (1.2 oz, 28 day) Untreated 0 5 10 15 20 25 30 35 40 45 Brown Patch Incidence (%)
  32. 32. Brown patch control in tall fescue, 2006 Armada (1.2 oz) Armada (0.6 oz) Heritage TL (2 fl oz) Heritage TL (1 fl oz) Heritage TL (0.5 fl oz) Headway (3 fl oz) Headway (2 fl oz) Headway (1.5 fl oz) Headway (0.75 fl oz) Untreated 0 3 6 9 12 15 Brown Patch Incidence (%)
  33. 33. Brown Patch Control: Combination Products A.I.s Trade Name Rate/1000 ft2 Interval $/acre/daytrifloxystrobin Armada 1.2 21 day $9+ triadimefon flutolanil + SysStar 2.2 28 day $9 thiophanate azoxystrobin + Headway 1.5 28 day $14propiconazole
  34. 34. What about granular fungicides?
  35. 35. Comparison of granular and sprayable fungicides, Charlotte, 2003. Systemic Fungicide G (87 oz) 3336 (4 oz) Fungicide VII G (85 oz) Bayleton (1 oz) Untreated 0 20 40 60 80 Brown Patch Incidence (%)
  36. 36. Bayleton (1 oz) Fungicide VII (85 oz)
  37. 37. ???
  38. 38. Modern granular carriers are improving fungicideperformance Heritage G Headway G Disarm G
  39. 39. Comparison of Granular and Sprayable Fungicides Heritage G (3 lb) Compass G (4 lb) Disarm G (2.3 lb)Heritage WG (0.2 oz) Untreated 0 3 6 9 12 15 Brown Patch Incidence (%) Granular treatments re-applied every 21 days, Heritage 50WG re-applied every 28 days
  40. 40. Environmental Impact Quotient (EIQ)What’s the real environmental impact? http://www.nysipm.cornell.edu/publications/eiq/
  41. 41. Product Rate/1000 ft2 Interval EIQ/monthHeritage 50WG 0.2 oz 28 days 7.3 Rhapsody 5 oz 7 days 7.6Bayer Fungus 2 lbs 14 days 28 Control Scotts Lawn 1.35 lbs 14 days 64Fungus ControlDaconil Ultrex 3.2 oz 14 days 538
  42. 42. Kentucky bluegrass diseases are becoming more common in landscapes
  43. 43. Mixtures help to reduce brown patch injury 30.0 Coronado + Livingston Coronado + Midnight Brown Patch Incidence (%) 22.5 15.0 7.5 0 100:0 97.5:2.5 95:5 90:10 Mixing Ratio (% by weight)Mixtures planted in Oct 1999Data collected on 29 Jun 2001
  44. 44. Mixtures are by weight, not number of seeds Tall Fescue Kentucky Bluegrass 500 seeds/gram 4,800 seeds/gram
  45. 45. Mixtures are by weight, not number of seeds Mix Ratio Tall Fescue Kentucky Bluegrass TF:KBG Seeds (#) Seeds (#) 90:10 204,000 218,000 95:5 216,000 109,000 97.5:2.5 221,000 54,000
  46. 46. Turfgrass populations may shift over time.... 100 %TF in 1999 %TF in 2002 75Percent Tall Fescue 50 25 0 100:0 97.5:2.5 95:5 90:10 Seed Ratio By Weight (TF:KBG)
  47. 47. Dollar spot is active when lows are above 50ºF and highs are below 90ºF
  48. 48. Summer patch is active when soil temperatures are above 65ºF
  49. 49. turfpathology.org: How to follow along... turfpathology.org facebook.com/turfpathology twitter.com/ncturfpathology feeds.feedburner.com/turfpathology

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