1. Program 2

2. Program 7

3. Curative Program 10

4. Results Penncross
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

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

9. Fungal Isolations
Rhizoctonia solani
Rhizoctonia zeae

10. 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

11. 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

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

13. Rhizoctonia zeae

14. Isolates Results
1999
2000

15. Results
1999

16. Results
2000

17. Clearys 3336 Not Effective on Rhizoctonia zeae

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

19. Clearys 3336
Clearys 3336

20. Rhizoctonia Reported 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

21. 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

23. AUDPC =

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

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

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

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

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

29. AUDPC = 4221

30. AUDPC =1011.5

31. Crenshaw Bent
Dollar Spot Fungicide Trial
Martin, 1999

32. AUDPC =1195.3

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

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

35. Dollar Spot Lesions
Bermudagrass Leaves

36. Program 3

37. Results A 1
Program 2
Program 3
Program 7
Curative Program 10

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

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

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

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

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

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

44. Difference Between Varieties

45. Difference Between Varieties

46. Difference Between Varieties

47. Difference Between Varieties

48. R. solani

49. 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