Ed Peachey and Chal Landgren, OSUCHRISTMAS TREE WEEDIDENTIFICATION ANDCONTROL
Outline for today§  3:45-Weed biology and implications for    control§  4:00 Weed ID  ú  1st step to successful control...
Weed Biology and Control
Weed Seedbanks(ie seeds living in the soil)                 Source: vric.ucdavis.edu/issues/vegnotes-tomato/weedseed.gif
Weed seed predation videos
Weed Seed Lifespan in Soil§  Many seeds are shorter lived if on the soil  surface  ú  Seed predation  ú  Desiccation§ ...
Depth of Emergence§  Typically ½ to ¾ inch§  Occasionally up to 2 inches for large seeds§  Many seeds may germinate but...
Seed dormancySeasonal periodicity of germination
Factors that influence germinationand weed shifts§  Water§  Temperature§  Oxygen       ú  Tillage provides oxygen to s...
Herbicides and weed seeds§  Herbicides generally do not effect weed    seeds§  Only seeds that are germinating§  Except...
Successful use of PreemergenceHerbicides§  Apply before seeds germinate§  Activate§  Protect the barrier
Preemergence HerbicidesRainfall/tillage                                 ½ to 1                               inch thick   ...
Seedbanks are a black box             What goes in, might come out
Plant Characteristics + Selection Pressure             = Weed Shifts  Plant Characteristics           Selection pressure o...
Weed IdentificationFirst step to effective control
Dirty Dozen                    Horseweed (marestail)                        1    Annual          Lettuce, prickly         ...
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
Christmas Tree Weed Identification and Control
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Christmas Tree Weed Identification and Control

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Christmas Tree Weed Identification and Control

  1. 1. Ed Peachey and Chal Landgren, OSUCHRISTMAS TREE WEEDIDENTIFICATION ANDCONTROL
  2. 2. Outline for today§  3:45-Weed biology and implications for control§  4:00 Weed ID ú  1st step to successful control§  4:15 Herbicides: site of action and efficacy§  4:45 Sprayer calibration§  5:00 Finding weed control info on the web
  3. 3. Weed Biology and Control
  4. 4. Weed Seedbanks(ie seeds living in the soil) Source: vric.ucdavis.edu/issues/vegnotes-tomato/weedseed.gif
  5. 5. Weed seed predation videos
  6. 6. Weed Seed Lifespan in Soil§  Many seeds are shorter lived if on the soil surface ú  Seed predation ú  Desiccation§  Grass weeds 1-3 yr seed survival§  Broadleaved 3-7 yr seed survival
  7. 7. Depth of Emergence§  Typically ½ to ¾ inch§  Occasionally up to 2 inches for large seeds§  Many seeds may germinate but not emerge=fatal germination
  8. 8. Seed dormancySeasonal periodicity of germination
  9. 9. Factors that influence germinationand weed shifts§  Water§  Temperature§  Oxygen ú  Tillage provides oxygen to seeds§  Light ú  Light flash during tillage may cause germination ú  Weeds sense light quality changes caused by§  Proximity to surface §  Moves seed from deep in the soil where it is preserved§ 
  10. 10. Herbicides and weed seeds§  Herbicides generally do not effect weed seeds§  Only seeds that are germinating§  Exception is fumigant metam
  11. 11. Successful use of PreemergenceHerbicides§  Apply before seeds germinate§  Activate§  Protect the barrier
  12. 12. Preemergence HerbicidesRainfall/tillage ½ to 1 inch thick Too much rain/ water/or tillage
  13. 13. Seedbanks are a black box What goes in, might come out
  14. 14. Plant Characteristics + Selection Pressure = Weed Shifts Plant Characteristics Selection pressure or methods of controlGrowth habit 1.  Prevention ú  Perennial ú  Annual 2.  Cultural ú  Biennial 3.  ChemicalPlant family Grass, broadleaf, sedge 4.  MechanicalSeason of emergence or 5.  Biological growthRoot system: tap root vs surface rootsSeed dispersal: short vs long distance
  15. 15. Weed IdentificationFirst step to effective control
  16. 16. Dirty Dozen Horseweed (marestail) 1 Annual Lettuce, prickly 2 broadleaves Sowthistle, annual 3 Northern willow herb 4 Bindweed, field 5 Perennial Thistle, Canada 6 broadleaves Blackberry Biennials Queen Anne’s lace 7 Barnyardgrass 8 Annual Grasses Witchgrass 9 Bentgrass 10Perennial grasses Fescue, rattail 11

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