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Weed Control for Organic Farmers
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Weed Control for Organic Farmers

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Weed Control for Certified Organic Farmers …

Weed Control for Certified Organic Farmers

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  • 1. Weed Control For Certified Organic Farmers Tom Lanini University of California, Davis
  • 2. Organic Weed Control • • • • • Mulches Water management g Cultivation Flamers Organic Herbicides
  • 3. Mulches • Act by blocking light • Numerous organic and synthetic materials can be used th ti t i l b d for this purpose
  • 4. Seedlin emerg ng gence (N No./m2) Seedling Emergence relative to Light Dark 600 500 400 300 200 100 0 Light Light + Glass
  • 5. String trimmer damage?? Rodents???
  • 6. Lumite Mulch M l h Wood chip p Mulch
  • 7. Water Management
  • 8. Preirrigation for weed seed  reduction prior to crop planting d i i l i Questions: • Is furrow irrigation any different than sprinkler irrigation as a preirrigation method • H How l long should you wait after h ld it ft preirrigation before weed removal • What is the most effective method of weed removal – flamer or cultivation
  • 9. Hand Weeding Time as Affected  by Preirrigation and Weed  by Preirrigation and Weed Removal Timing and Method g H Hand wee eding time (min/plo e ot) 7 Day wait 14 Day wait 12 10 8 6 4 2 0 No Preirrigation Furrow Sprinkler
  • 10. Preirrigation Conclusions Preirrigation Conclusions • Maximum weed emergence occurred at 120 to 130 cumulative degree days (base temperature = 10°C) 10 C) • Preirrigation/weed removal was less beneficial when weed density is low • Hand weeding times are reduced if preirrigation d i i ti and weed removal are performed d l f d prior to crop planting.
  • 11. Cultivation • Best when weeds are small • Dry conditions after cultivation help to prevent re-rooting • Shallow cultivation reduces the quantity of new seeds brought to the surface
  • 12. Weed Seed Emergence relative to Depth (inches) Optimum depth Maximum depth Wild oat 1.0 10 7.0 70 Shepherdspurse 0.2 0.8 Lambsquarters 0.3 2.0 g Crabgrass 0.4 1.6 Foxtail 1.0 3.0 Chickweed Chi k d 0.4 04 0.8 08 King 1966
  • 13. Night Cultivation? • Some studies have found that cultivation at night reduces weed germination • GPS guided systems (?) p • Better results after repeat treatments • At worst, you lose a little sleep
  • 14. Propane Flamers • Kills weeds like a contact eeds herbicide • Treated leaves go from a glossy g g y to a mat finish • Fuel cost??
  • 15. Just prior to flaming
  • 16. 5 minutes after flaming
  • 17. 10 minutes after flaming
  • 18. Organic Herbicides Registered for Food Use • • • • • C-Cide Green Match O Matran EC Weed Zap Green Match EX Not Registered for Food Use • Pine Oil • Racer* • Acetic Acid – must be food grade All are contact type herbicides – no residual activity
  • 19. C-Cide 33% @ 70 GPA 55º F at application
  • 20. C-Cide 33% + 1% NuFilm P @ 70GPA 74ºF
  • 21. C-Cide 33% + 1% NuFilm P @ 70GPA 10 DAT
  • 22. C-Cide 25% 70gpa + 0.5% Natural Wet 81 ºF at application
  • 23. C Cide C-Cide 25% 70gpa + 0.5% Natural Wet 81 ºF at 1st and 76 ºF at 2nd application – treated twice
  • 24. For Control of Annual and Broadleaf Weeds In Non-Crop Areas ACTIVE INGREDIENT: d-limonene …………… 70% INERT INGREDIENTS INGREDIENTS:……….…..………….…. 30% Total ........................................................................100% KEEP OUT OF REACH OF CHILDREN CAUTION EPA Reg. No. 82052 - 1 R N EPA Est. No. 82052-GA-1 Manufactured by: Cutting Edge Formulations, Inc. 5106 Bristol Industrial Way y Buford, GA 30518 (866) 906-WEED DIRECTIONS FOR USE: It is a violation of Federal Law to use this product in a manner inconsistent with its labeling. General information: GREENMATCH O is a broad spectrum weed killer that contains a citrus extract. It is non-selective and controls most annual weeds, both grasses and broadleaves. For best performance, complete coverage of target weeds is necessary. Spray until thoroughly wet. It is recommended for non-food areas such as borders, driveways, sidewalks, around mature trees and ornamentals, around buildings, in greenhouses and around flower beds.
  • 25. GreenMatch O 10% + 1% NuFilm P @ 70 GPA 55ºF at application
  • 26. GreenMatch O 15% + 1% Natural wet @ 70gpa 81º F
  • 27. GreenMatch O 15%+ 1% Natural wet @ 70gpa - treated twice
  • 28. Matran EC 10% + 1% Natural Wet @ 35 GPA 55º F at application
  • 29. Matran EC 15% + 1% Natural Wet @ 35 GPA 55º F at application
  • 30. Matran EC 10% + 1% NuFilm P @ 70 GPA 74º F
  • 31. Matran EC 10% + 1% NuFilm P @ 70 GPA 10 DAT
  • 32. Matran 15% + 0.05% Natural wet @ 70 gpa
  • 33. Vinegar 20% + 1% NuFilm P @ 70 GPA 55ºF 55 F
  • 34. Vinegar 20% + 1% NuFilm P @ 70 GPA Treated twice
  • 35. Vinegar 20% + 1% NuFilm P @ 70 GPA 74ºF
  • 36. Vinegar 20% + 1% NuFilm P @ 70 GPA 10 DAT
  • 37. Vinegar 20% 70gpa + 0.05% Natural Wet 0 05% 81ºF at application
  • 38. Vinegar 20% 70gpa + 0.05% Natural Wet – Treated twice
  • 39. 0.25% v/v Natural Wet 35 gallons per acre spray volume
  • 40. 16 Days after treatment
  • 41. WeedZap 15% + 1% Natural Wet @ 35 GPA 55º F at application pp
  • 42. WeedZap 20% + 1% NuFilmP @ 35 GPA 10 DAT
  • 43. WeedZap 10% @ 70 GPA p 10 DAT
  • 44. WeedZap 10% 70gpa + 0.05% Natural wet 0 05%
  • 45. GreenMatch EX 15% @ 35 GPA 10 days after application
  • 46. GreenMatch EX 15% 70gpa + gp 0.05% Natural wet
  • 47. GreenMatch EX 10% 70 GPA 1% NuFilm P
  • 48. Does age (size) make a difference? d 2nd application d li i date Gr rass control (% %) Youngest g Oldest 100 90 80 70 60 50 40 30 20 10 0 C-Cide GreenM GreenM EX Matran Vinegar WeedZap S. Horimoto, unpublished
  • 49. Organic Adjuvants Organic adjuvants
  • 50. Matran 10% - 2 DAT
  • 51. Matran 10% + Organic Adjuvant 1% - 2 DAT
  • 52. Matran + WE 1098 – 1 DAT M t
  • 53. Matran + WE 1098 8 DAT
  • 54. Organic Herbicides • Good spray coverage is essential 70 GPA? • Work better in warm (sunny?) weather (80ºF) • Organic adjuvants improve weed control • Treat when weeds are small • Repeat applications are needed for larger weeds
  • 55. Prevention • Avoid letting weeds go to seed • Do not let weeds come in on equipment
  • 56. Questions?

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