Presented in “China – Thailand Geo-Informatics Workshop Series I: Agricultural Applications” 30 June - 2 July 2010 at Pattaya, Thailand

1. Disease Epidemic and Severity of Rice Blast , Rice Brown Spot and Rice Narrow Brown Spot in Lower Yom Basin Off-season Rice Using Geo-Informatics

4. Method 1. Satellite use LANDSAT 5 Supported by GISTDA 6 date beginning from December 2008 - May 2009

6. 4. Confirmed the diseases causing agents under compond microscope in laboratory

7. Rice blast symptom Caused of Biporalis oryzae and Curvularia lunata )

8. Rice brown spot symptom ( Biporalis oryzae )

9. Rice Narrow Brown Spot caused of Cercospora oryzae

11. The raw data from the LANDSAT had been adjusted the intensity of band 3 and band 4 with linear equations. For provide the valuable information on the intensity between 0 - 255.

12. Multispectral from the LANDSAT in 7 periods Lower Yom Basin 9 th December 2008

13. 10 th January 2009

14. 26 th January 2009

15. 11 st February 2009

16. 27 th February 2009

17. 16 th April 2009

18. 18 th May 2009

19. multispectral data from LANDSAT in each date had been using for create DVI = (B4-B3) (B4+B3)

20. DVI on Lower Yom Basin 9 th December 2008

21. DVI on Lower Yom Basin 10 th January 2009

22. DVI on Lower Yom Basin 26 th January 2009

23. DVI on Lower Yom Basin 11 th February 2009

24. DVI on Lower Yom Basin 27 th February 2009

25. DVI on Lower Yom Basin 16 th April 2009

26. DVI on Lower Yom Basin 16 th May 2009

27. Step 1 : Classified data from DVI in Multi Date (3 dates) Supervised classification into 5 classes Class 1 = Bared soil Class 2 = Seedling Stage Class 3 = Tillering Stage Class 4 =Maturing Stage Class 5 = Haversting Stage Step 2 : Intersect paddy field frame which derived from Land Development Department

28. Step 3 : Calculation paddy field area in each growth stage Seedling Stage

29. Tillering Stage January 2009

30. Maturing Stage or Flowering Stage February 2009

31. Harvesting Stage March 2009

32. Preparation Stage April 2009

33. Seedling Stage May 2009

34. Percentage of area under off - season rice growth stages .

35. Days after planting %DVI % DVI = -0.0222X 2 + 2.5325X - 15.178 ; R 2 = 0.809 Tillering Stage 57 days

38. Dbl = Rice Blast Disease Ds = Rice Brown Spot Dst = Rice Narrow Brown Spot or Streak

40. DVI Stage R Stage R DBL Dec09

41. showed ≤ 10% = 66.99% December 2008 showed ≤ 15% = 33.02% Rice Blast Disease Severity

42. January 2009 showed ≤ 10% = 93.69% Rice Blast Disease Severity

43. showed ≤ 15% = 31.91% February 2009 showed ≤ 10% = 46.78% Rice Blast Disease Severity showed ≤ 5% = 26.70%

44. Rice Blast Disease Severity showed ≤ 15% = 47.85% showed ≤ 10% = 20.24% March 2009 showed ≤ 5% = 20.24%

45. April 2009 showed ≤ 15% = 15.88% showed ≤ 10% = 34.93% showed ≤ 5% = 49.18% Rice Blast Disease Severity

46. May 2009 showed ≤ 15% = 3.84% showed ≤ 10% = 13.89% showed ≤ 5% = 82.27% Rice Blast Disease Severity

47. February 2009 showed ≤ 10% = 14.66% showed ≤ 5% = 82.54% Rice Brown Spot Disease Severity showed no symptom = 2.80%

48. March 2009 showed ≤ 10% = 70.96% showed ≤ 5% = 29.04% Rice Brown Spot Disease Severity

49. April 2009 showed ≤ 10% = 95.54% showed no symptom = 6.46% Rice Brown Spot Disease Severity

50. May 2009 Rice Brown Spot Disease Severity showed ≤ 10% = 96.31% showed no symptom = 3.69%

51. Rice Narrow Brown Spot Disease Severity showed ≤ 5% = 58.16% February 2009 showed no symptom =41.81%

52. March 2009 showed no symptom = 14.84% showed ≤ 5% = 85.66% Rice Narrow Brown Spot Disease Severity

53. showed ≤ 5% = 100% April 2009 Rice Narrow Brown Spot Disease Severity

54. Rice Narrow Brown Spot Severity showed ≤ 5% = 100% May 2009

55. Conclusion Rice blast disease severity was decreased from January to May. Off-season rice growing area showed moderately disease severity in 33.02 of planting area. But showed low disease severity in 82.27% of planting area.

56. - Rice brown spot symptom was not found on December and January. But rice brown spot disease was increasing in infection area on February until May, in the low level of disease severity. - Rice narrow brown spot symptom was not found on December and January. But rice narrow brown spot disease was increasing in infection area on February until May, in the low level of disease severity