Turf Disease Management: Can it be done without fungicides?

1,607
-1

Published on

Published in: Education, Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,607
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
29
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Turf Disease Management: Can it be done without fungicides?

  1. 1. Turf Disease Management:Can it be done without fungicides?Lane TredwayAssociate Professor and Extension SpecialistDepartment of Plant PathologyNorth Carolina State University
  2. 2. What is sustainable? capable of being continued with minimal long- term effect on the environment (American Heritage Dictionary)of, relating to, or being a method of harvesting or usinga resource so that the resource is not depleted orpermanently damaged (Merriam-Webster) capable of being maintained at a steady level without exhausting natural resources or causing ecological damage (Collins)
  3. 3. Which practice is least sustainable?1. removing trees to increase sunlight and air movement2. planting a variety containing resistance genes from grasses collected in Poland3. planting a variety containing frog dermaseptin genes4. applying the biofungicide Rhapsody (Bacillus subtilis)5. applying fungicide Heritage (azoxystrobin)6. applying a mixture of soda, beer, soap, ammonia, and mouthwash
  4. 4. Which practice is most sustainable?1. removing trees to increase sunlight and air movement2. planting a variety containing resistance genes from grasses collected in Poland3. planting a variety containing frog dermaseptin genes4. applying the biofungicide Rhapsody (Bacillus subtilis)5. applying fungicide Heritage (azoxystrobin)6. applying a mixture of soda, beer, soap, ammonia, and mouthwash
  5. 5. How do plant diseases develop? Di se as e- st Co Ho n du e ibl c t ive ep Amount of sc En Disease Su vir on me nt Pathogen
  6. 6. The environment triggers disease development.
  7. 7. Fungal growth is driven bytemperature and moisture.
  8. 8. How are turfgrass diseases managed? Di se as e- st Co Ho n du e ibl c t ive ep Amount of sc En Disease Su vir on me nt Pathogen
  9. 9. How are turfgrass diseases managed?Plant a disease- resistant Dise ase- species or Con duc variety ive En viron 25% Disease men t Pathogen
  10. 10. How are turfgrass diseases managed? Plant a disease- Remove trees to resistant species increase sunlight or variety and air movement 10% Disease Pathogen
  11. 11. How are turfgrass diseases managed? Remove trees Plant a disease- to increase resistant species sunlight and or variety air movement 2% Disease Apply a fungicide to suppress pathogen growth
  12. 12. 0% 5% 10%Establish a threshold. How much damage is acceptable? En vir st on Ho me nt Pathogen
  13. 13. Disease management begins at planting. st Ho
  14. 14. Turf Species Vary in their Disease SusceptibilityKentucky bluegrass - summer patch, dollar spot, leaf spot,rustperennial ryegrass - dollar spot, red thread, Pythium blight,gray leaf spot, brown patch, rusttall fescue - brown patchfine fescues - dollar spot, summer patch, red thread st Ho
  15. 15. Varieties vary widely in their susceptibility to certain diseases.
  16. 16. Most land/grant universities evaluate turf varieties.
  17. 17. ntep.org st Ho
  18. 18. Healthy, well-managed turf is veryresistant to disease.
  19. 19. Ho st
  20. 20. Nitrogen has the greatest impact on turf growth.
  21. 21. EVERY turf disease is influenced by nitrogen. Anthracnose Brown Patch Dollar Spot Pythium Blight Fairy Ring Gray Leaf Spot Pythium Root Dysfunction Spring Dead Spot Red Thread Large Patch Rust Snow Molds Low Nitrogen High Nitrogen
  22. 22. well-fertilized under-fertilized st Ho
  23. 23. Over-fertilizationproduces leaves thatare soft, lush, andeasy to infect by thefungi that causebrown patch,Pythium, and otherdiseases. st Ho
  24. 24. Mowing has a tremendous effect on turf health.
  25. 25. Mowing practices influence gray leaf spot development. Mowing Height 50 Gray Leaf Spot Incidence (%) 40 30 20 10 0 1.5” 2.5” 3.5” Mowing Height st Ho
  26. 26. Mowing practices influence gray leaf spot development. Clipping Collection 50 Gray Leaf Spot Incidence (%) 40 30 20 10 0 Collected Returned st Ho
  27. 27. The environment drives diseasedevelopment.
  28. 28. Does irrigation cause as manyproblems as it solves?
  29. 29. Summer Patch is Impacted by Mowing and Irrigation 40 1.5” Summer patch incidence (%) 3.0” 30 20 10 0 Light, Frequent Deep, Infrequent Davis and Dernoeden, 1991
  30. 30. Reducing leaf wetness suppresses dollar spot. 140 DewCure 2 oz 120 Dollar Spot Incidence Check 100 80 60 40 20 0 3 1 8 5 10 17 24 15 22 29 12 6/ 7/ 7/ 8/ 6/ 6/ 6/ 7/ 7/ 7/ 8/ Clarke, Rutgers University
  31. 31. Suppressing pathogen growth and survival. Pathogen
  32. 32. Are fungicides sustainable?
  33. 33. Environmental Impact Quotient (EIQ)What’s the real environmental impact? http://www.nysipm.cornell.edu/publications/eiq/
  34. 34. 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 Pathogen
  35. 35. Too many fungicidesto choose from! flickr:kanickmoses
  36. 36. Get an accurate diagnosis!
  37. 37. Disease Management Utility turffiles.ncsu.edu/diseasemgmt
  38. 38. Disease Management Utility on TurfFiles turffiles.ncsu.edu/diseasemgmt
  39. 39. Soil pH impacts micronutrient availability.
  40. 40. Spring dead spot Summer patchTake-all patch Necrotic ring spotPatch diseases are enhanced by high soil pH. Pathogen
  41. 41. Nitrogen source influences soil pH Soil Root NH4+ soil pH decreases H+ NO3- soil pH increases OH-
  42. 42. What about biological control?Biologicals• a living organism is applied to the turf, which may inhibit disease through a variety of mechanismsBiofungicides• an inhibitory compound, derived from a specific microbe, is concentrated and applied to the turfComposts• stimulate activity of soil microbes• some of which may be beneficial• some may be harmful or pathogenic
  43. 43. Rhapsody (2%) Rhapsody (3%) Untreated 200Dollar Spot Incidence 150 * * 100 50 0 4 May 18 May 1 Jun 15 Jun 1 Jul 15 Jul Rhapsody applied every 14 days
  44. 44. How to follow along... turfpathology.org facebook.com/turfpathology twitter.com/ncturfpathology feeds.feedburner.com/turfpathology
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×