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Program 2

Program 2. Program 7. Curative Program 10. Results Penncross. Program 2 Program 7 Curative Program 10. Programs 2,7. Spray 5. Spray 2. Spray 4. Spray 3. Spray 6. Spray1. Difference Between Varieties. Program 7. Clearys 3336. Daconil Ultrex. Prostar. Heritage. Fore. Banner

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Program 2

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  1. Program 2

  2. Program 7

  3. Curative Program 10

  4. ResultsPenncross • Program 2 • Program 7 • Curative Program 10

  5. Programs 2,7 Spray 5 Spray 2 Spray 4 Spray 3 Spray 6 Spray1

  6. Difference Between Varieties

  7. Program 7 Clearys 3336 Daconil Ultrex Prostar Heritage Fore Banner Maxx

  8. Fungal Isolations • Rhizoctonia solani • Rhizoctonia zeae

  9. Objectives • Determine which Rhizoctonia species are present • Determine when they occur • Determine if some fungicides are more effective than others for control of the different species

  10. Materials and Methods • Samples of Brown Patch taken twice monthly • Diseased leaves surface sterilized and plated out on water agar • Mycelia transferred to Potato Dextrose Agar • Fungi identified after cultures have matured

  11. Typical AG 2,2 IIIB (“mat rush”) culture appearance ~ 3 wk, PDA

  12. Rhizoctonia zeae

  13. Isolates Results 1999 2000

  14. Results 1999

  15. Results 2000

  16. Clearys 3336 Not Effective on Rhizoctonia zeae

  17. Programs 6,7 Daconil Ultrex Clearys 3336 Heritage Clearys 3336

  18. Clearys 3336 Clearys 3336

  19. RhizoctoniaReported from Turfgrasses Rhizoctonia solani AG 1 1 A - “sasakii” type - primary pathogen of tall fescue 1 B - “web blight” - sometimes from Poa AG 2,2 IIIB - “mat rush” type - cool season grasses “Turf “ - warm season grasses AG 4 - “praticola” - damping-off; unspecialized AG 5 - rare in tall fescue Rhizoctonia zeae Rhizoctonia oryzae Rhizoctonia cerealis CAG 1 or AG-D -yellow patch in the US AG Q - yellow patch in Japan Weakly virulent or avirulent Binucleate species

  20. Rhizoctonia Blight (Brown Patch) of Cool-season Turfgrasses • Agrostis, Poa, Festuca, Lolium spp. all affected • Favored by warm, humid summertime conditions • “Smoke Ring” symptom characteristic on low mowing heights ( especially Agrostis) • Leaf lesions initially result from mycelium from sclerotia or colonized host tissue; lesions may consume entire leaves • Rhizoctonia solani AG 1, 1A “sasakii” type and Rhizoctonia solani AG 2,2 IIIB “mat rush” type are the most prevalent pathogens

  21. AUDPC = 4025.9

  22. AUDPC =843.5 cd Al Sig + Fore Dac + Al Sig. Dac Ult Banner + Dac Ult Banner + Daconil Ult. Heritage

  23. AUDPC = 673.8 d DacUlt + Al Sig Prostar Al Sig + Fore Heritage + Prostar Al Sig + Fore Heritage

  24. AUDPC = 722.8 d Sentinel + Daconil Ult. Daconil Ultrex Consyst Heritage Daconil Ultrex+ Aliette Sig Daconil Ult + Banner

  25. AUDPC =1374.6 b Heritage Prostar Dac Ult Clearys 3336 Banner Maxx Fore

  26. AUDPC =1103.4 bcd Heritage Prostar Prostar Consyst Chipco 26019 Dac Ult

  27. AUDPC = 4221

  28. AUDPC =1011.5

  29. Crenshaw Bent Dollar Spot Fungicide Trial Martin, 1999

  30. AUDPC =1195.3

  31. AUDPC =855.8 Heritage- 0.2 oz Banner + DacUlt- 1 + 3.8 oz DacUlt - 3.8 oz Consyst - 4 oz DacUlt+ Al Sig - 3.8+4 oz Banner + DacUlt - 1 + 3.8 oz

  32. AUDPC =822.5 DacUlt - 3.8 oz Eagle + DacUlt - 0.4+3.1 oz Eagle + DacUlt- 0.4 + 3.1 oz Fore + Eagle - 6 + 0.34 oz Heritage - 0.2 oz Fore + Aliette - 8 + 4 oz

  33. Dollar Spot Lesions Bermudagrass Leaves

  34. Program 3

  35. ResultsA 1 • Program 2 • Program 3 • Program 7 • Curative Program 10

  36. Programs 2,3,7 Spray 5 Spray 6 Spray 4 Spray 2 Spray 3 Spray 1

  37. Program 2 Fore Daconil Ultrex + Chipco Sig. Chipco 26GT Daconil Ultrex Daconil Ultrex + Chipco Sig. Daconil Ultrex

  38. Program 3 Daconil Ultrex + Chipco Sig. Daconil Ultrex Heritage Chipco 26GT Daconil Ultrex Chipco 26GT

  39. Program 7 Heritage Fore Daconil Ultex Prostar Clearys 3336 Banner Maxx

  40. Program 10 Heritage + Daconil Ultrex Daconil Ultrex Heritage Chipco Sig. + Daconil Ultrex

  41. Program 3 Daconil Ultrex Heritage Chipco 26GT Daconil Ultrex + Chipco Sig. Chipco 26GT Daconil Ultrex

  42. Difference Between Varieties

  43. Difference Between Varieties

  44. Difference Between Varieties

  45. Difference Between Varieties

  46. R. solani

  47. Conclusions • Preventative programs more effective than curative programs • Fungicide selection and timing critical • Rhizoctonia zeae most likely to occur during hottest times of the summer • Varieties of bentgrass do differ

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