1 / 23

Christmas Tree Weed Control TREE SCHOOL 2012

Christmas Tree Weed Control TREE SCHOOL 2012. Paul Borgen Agronomy Manager Pratum Co-op Salem, OR. Resources. PNW Weed Control Handbook Weeds of the West Extension Publications http://eesc.oregonstate.edu. Why control weeds?. Ease of harvest Weed cover harbors pests

Download Presentation

Christmas Tree Weed Control TREE SCHOOL 2012

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. Christmas Tree Weed ControlTREE SCHOOL 2012 Paul Borgen Agronomy Manager Pratum Co-op Salem, OR

  2. Resources • PNW Weed Control Handbook • Weeds of the West • Extension Publications • http://eesc.oregonstate.edu

  3. Why control weeds? • Ease of harvest • Weed cover harbors pests • Compete for water and nutrients

  4. Why control weeds? • Remember that control does not mean elimination • Benefits of leaving some vegetation

  5. Keys to success • Know your weeds • Properly calibrated equipment • Know the proper rate

  6. Keys to success • Start clean • Keep good records • Expect to do more than spray once and forget it

  7. Weed Shifts • Weed infestations change depending on cultural practices • Cultivation promotes deep rooted plants • Mowing promotes prostrate weeds • Use of the same chemicals promote tolerant weed species (e.g. false dandelion, field bindweed, rattail fescue)

  8. Preventing Weed Shifts • Combine a variety of cultural practices and chemical treatments • Understand the effect each practice or product has on your particular weed population • Alternate or combine chemicals effectively • Use different modes of action or chemical families • Target specific weeds or get broad spectrum

  9. Preventing Weed Shifts • Keep records of how your practices affect weeds • Note how each herbicide affects each weed then tank-mix or alternate to achieve desired results • Reduce chance of promoting resistant species

  10. Preventing Weed Shifts • Combine or rotate practices; • mechanical • hand removal • spot treatment • Band spray • broadcast spray • wipers • Provide cost effective, year-round control

  11. Ground Covers • Remove unwanted weeds • Plant sub-clover or dwarf plant varieties • Regulate vegetation height with with sub-lethal rates of chemicals (chemical mowing) • Spot spray is necessary to keep unwanted weeds in check

  12. Ground CoversBenefits • Reduces soil erosion • Improve traffic conditions in wet weather • Aids in harvest • Reduces mud on trees at harvest

  13. Ground CoversDrawbacks • Monitoring and management is necessary during much of growing season • Frequent mowing is necessary to regulate height if chemicals are not an option • Still provides competition for tree and harbors pests • Difficult to maintain around tree bases

  14. Soil Active Herbicides • Residual weed control • Pre-emergent activity, Post-emergent activity or both • Apply late Winter/early Spring • Most need rain to activate chemical in soil • Can combine with contact herbicides • Apply March through April

  15. Foliar Active Herbicides • Leaf or stem contact control only • Little or no soil residual qualities • Apply to actively growing plants • 2 days to several weeks needed to show results • May be tank-mixed with some soil residual products

  16. Product Review • Always read and follow label directions • Obtain specific directions for rates, timing, and application • The label is the law!

  17. Triazines • Atrazine • Simazine • Velpar

  18. Atrazine • Root absorbed • Water solubility 33 ppm (Simazine 3.5ppm) • Inhibits photosynthesis • OK on newly transplanted conifers

  19. Velpar • Also inhibits photosynthesis • Water solubility 33,000 ppm • Not restricted use…except in WA • Better on perennial grasses

  20. Post-emergent Grass Killers • Arrow • Poast / Vantage • Envoy Plus

  21. Post-emergent Grass Killers • Inhibit the growing point • Very slow to show symptoms • Surfactants a must • Summer annual grasses

  22. DNA’s • Surflan • Barricade • Pendulum

More Related