1 / 45

Weed Control

Weed Control. Weeds. Competition Space Light Nutrient Water Physical Damage Morningglories Honeyvine Milkweed. Weed free for 6 weeks Tobacco canopy tolerates late competition. Weedy for 4 weeks Weed Control after weedy problem No competition. Tolerance to Competition. Cultivation.

kapono
Télécharger la présentation

Weed Control

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Weed Control

  2. Weeds • Competition • Space • Light • Nutrient • Water • Physical Damage • Morningglories • Honeyvine Milkweed

  3. Weed free for 6 weeks Tobacco canopy tolerates late competition Weedy for 4 weeks Weed Control after weedy problem No competition Tolerance to Competition

  4. Cultivation • Shallow (1 inch deep) • Reduces root damage • Doesn’t disturb herbicide placement • Shears of weeds • Breaking crust

  5. Cultivation • Deep Cultivation • Damages roots • Brings up untreated soil • Misconception? • Brings up moisture during a drought

  6. Rolling Cultivators • Shallow Cultivation • Scrapes surface • Hills plants • Faster Speed

  7. Ideal Herbicide • Controls Weeds • Broadleaf • Grasses • No Crop Injury • Non-persistent to cover crop or rotational crop • No drift or run-off • Safe for applicator

  8. Good Control Annual grasses Many Broadleaf weeds Pigweed Poor Control Rhizome Johnson Grass Hairy Galinsoga Common Ragweed Cocklebur Suppression Morningglories Prowl 3.3ECWeed Spectrum

  9. Application • Rates 2 to 3.6 pts/A • Incorporation 1 to 2 inches • Photosensitivity • Possible sun breakdown • Suppresses germinating weed seeds • Most in upper 2 inches • Crop safety • Plant roots below treated areas

  10. Activity & Mode of Action • Root & shoot inhibitor • Symptoms • Root pruning • Stunting • Mitotic poison • Not taken up by plants

  11. Symptoms

  12. Symptoms

  13. Symptoms – Phosphorus Deficiency

  14. Persistence Can cause cover crop damage especially in dry seasons

  15. Command 3 ME • Weed Spectrum • Good Control • Annual Grasses • Most Broadleaf Weeds including • Common Ragweed • Hairy Galinsoga • Velvetleaf

  16. Command 3 ME • Poor Control • Pigweeds • Seedling & rhizome Johnsongrass

  17. Application • Rates 2 to 2.67 pts/A • Placement • Surface application • Cover crop safety • Drift • Post-transplant • Within 7 days after transplanting

  18. Activity & Mode of Action • Photosynthesis inhibitor • Damages Chlorophyll • Turns plant white

  19. Persistence • Cover crop damage

  20. Spartan DF • Weed Spectrum • Good Control • Most Broadleaf Weeds Including • Morningglories • Yellow Nutsedge

  21. Spartan DF • Fair Control • Annual grasses • Poor Control • Common Ragweed • Seedling & rhizome Johnsongrass

  22. Rates (8 fl oz/A) (10.1 fl oz/A) If Morningglories or nutsedge are major weed problems Placement Best not incorporated Due to crop safety OK to scratch out tractor track Application

  23. Activity & Mode of Action • Photosensitizes • Plants actively take-up • Exposure to sunlight causes membrane disruption • Susceptible plants turn necrotic and die

  24. Persistence • Season long control • Grass cover crops are less sensitive

  25. Devrinol 50DF • Weed Spectrum • Good Control • Annual grasses • Fair to Poor Control • Most Broadleaf Weeds • Crop Safety • Good

  26. Application • Rate (2 lb/A) • Usually in combination with Tillam for improved broadleaf control • Post-transplant OK • but pre-emergence to weeds

  27. Activity & Mode of activity • Root growth inhibitor • Persistence • 12 month - can cause cover crop injury especially when applied post-transplant

  28. Tillam 6E • Weed Spectrum • Good Control • Annual grasses • Nutsedge • Fair to Poor Control • Many Broadleaf Weeds • Crop Safety • Good • Damage possible under specific conditions

  29. Application • Rate (2.67 qt/A) • Usually in combination with Devrinol for improved broadleaf control

  30. Activity & Mode of Activity • Taken up by plants and translocated to shoots • Has effect on meristemactic tissue

  31. Persistence • 3 to 6 weeks • Highly volatile • Readily leached by in soil • Can reverse leach after rainfall

  32. Weed Control in Burley TobaccoFayette Co. – David Tucker Farm

  33. Poast 1.53E • Weed Spectrum • Good Control • Annual & perennial grasses • No Control • Broadleaf Weeds • Application • Rate • 1.5 pts/A • Crop oil concentrate (1 qt/A) • Post-emergence

  34. Activity & mode of activity • Taken up by plants and translocated throughout • Slow acting • Persistence • None

  35. Diagnosing Chemical Damage in Tobacco • Look for symptom • Stunting • Leaf distortion • Abnormal vein patterns • Discoloration • Look for possible sources of chemical exposure • Drift • Other crops near by • Right of ways • Contaminated Sprayer • Contaminated Water Supply • Contaminated Fertilizer or Spreader Equipment

  36. Triazines • Chemicals • Atrazine • Simazine • Symptoms • Dead tissue between secondary veins • Green or yellow tissue adjacent to vein

  37. < 0.05 ppm No damage 0.05 - 0.20 Injury possible depending on climatic conditions > 0.20 Injury expected Run-off Contaminated Sprayer Corn Sprayer Back Siphon Contaminated Fertilizer Buggy Use of same buggies used for corn Triazine Test Crop Exposure

  38. Growth Regulators • 2,4-D, etc. • Damage only to developing leaves at time of drift • Can assess date of exposure • Banvel • Similar to 2,4-D • But damage more persistent • Tordon • Extreme sensitivity in tobacco .3 ppb • Water Soluble • Persistent in soil

  39. Growth Regulator Symptoms

  40. Accent/Beacon • Form Johnsongrass control in corn • Drifts for a considerable distance • Yellowing • Leaf tip • Spots • Causes restricted Vein (stem) growth • Lamina puckers

  41. Accent/Beacon - Symptoms

  42. Callisto

  43. Unknown

  44. Sheep Dip

  45. Skunk Damage

More Related