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Developed by Pringle Creek Watershed Council Salem, Oregon

Developed by Pringle Creek Watershed Council Salem, Oregon. Urban Weed Management. Presentation overview. Definition of “weeds” Weed impacts Ways to identify and control common invasive plants How to tackle weeds in your yard Resources for additional help . What is considered a weed?.

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Developed by Pringle Creek Watershed Council Salem, Oregon

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  1. Developed by Pringle Creek Watershed CouncilSalem, Oregon Urban Weed Management

  2. Presentation overview • Definition of “weeds” • Weed impacts • Ways to identify and control common invasive plants • How to tackle weeds in your yard • Resources for additional help

  3. What is considered a weed? • Any plant growing where it is not wanted. • Invasive and noxious weeds are the most troublesome. • Rapidly dominate the site • Very difficult to control

  4. Noxious Weeds in Oregon • Landowners are responsible for controlling the spread of noxious weeds on their property • Class A – worst; Class B – not as bad • Class “A” Weeds Class “B” Weeds

  5. Weed impacts • Out-compete other plants for water, nutrients, and sun • Costly and difficult to control • Loss of wildlife and fish habitat; yard space • Some are toxic to people and animals • Decrease property value • Increase erosion • Can take over recreational areas • Minimize land uses • Spread rapidly

  6. How do weeds spread? • Humans • Pets • Wildlife • Water • Wind • Vehicles • Machinery • “Wildflower” mixes • We plant them • Soil disturbance

  7. Weed Management Prevention is the most effective practice of all! • Buy clean seed for wildflowers or lawns; don’t plant weeds! • Clean yard equipment before using it in another area • Control weeds along streams • Use mulch materials or weed mats • Pull weeds early – before they go to seed!

  8. Control Methods Mechanical • Mowing, hand pulling, burning, solarizing Cultural • Shading, site preparation, plant appropriate competitive vegetation Biological • Parasites, predators, and pathogens; typically a slow process Chemical • Often requires repeated application; can be sprayed, wiped or painted onto leaves or stumps; usually most effective in fall; USE ACCORDING TO LABEL

  9. English Ivy (Hedera helix) • Perennial • Woody evergreen vine • Reproduces by seed and roots • Can kill trees! • Berries are poisonous to most wildlife. Starlings love them! Control methods: • hand pull or roll up vines • cut stems on vines in trees & pull away lower vines from trunk • apply herbicides (requires repeated application due to waxy leaves)

  10. Himalayan Blackberry (Rubus discolor) • Perennial • Deciduous to partially evergreen • Reproduces by seed and roots • Doesn’t grow as well in shade Control: • mow (at ground level) repeatedly • dig or pull up root crowns • deep shade from larger trees • apply herbicides in the fall to leaves or cut stumps

  11. Bull Thistle (Cirsium vulgare) • Biennial • 2-5 feet tall • Flowers purple July-September • Reproduces by seed • Seed can be viable for 10 years Control: • hand pull • cut or mow before going to seed • apply herbicides in late fall or early spring

  12. Canada Thistle (Cirsium arvense) • Perennial • Flowers light pink-purple • Grows 1-4 feet tall • Has deep horizontal roots • Reproduces through creeping roots, some seed Control: • pull by hand (small plants) • apply herbicides; spot-spraying young plants is very effective

  13. Japanese Knotweed (Polygonum cuspidatum) • Perennial • Can grow up to 12 feet tall • Hollow, bamboo-like stems • Long creeping roots • Dies back in winter Control: • Cut close to ground regularly (every 2 weeks during growing season)* • dig (small plants and surface roots) • apply herbicides to leaves & stems in the summer or early fall *be sure to properly dispose of all plant material

  14. Poison Hemlock (Conium maculatum) • Biennial • Grows to 10 feet tall • Tiny white flowers & purple-mottled stems • All parts of plant are highly poisonous (if eaten) • Reproduces by seed Control: • hand pull or dig* (small plants) • apply herbicides in early spring or late fall *be sure to wear gloves & properly dispose of all plant material

  15. Scotch Broom(Cytisus scoparius) • Perennial • Woody shrub with dark green branches, 3-10 feet tall • Reproduces by seed; seeds are protected by a flat pod • Soil disturbance results in a new crop of seedlings  Control: • pull with weed wrenching tool • mow or cut (prior to seed ripening) • apply herbicides to foliage while actively growing or bark anytime

  16. Reed Canarygrass (Phalaris arundinacea) • Perennial grass • Leaves ¼ - ¾ inches wide • Stems 2-7 feet tall, covered by waxy coating • Forms thick mat of roots and rhizomes Control: • hand pull or mow • solarize • shade out the plant • apply herbicides in early spring or fall

  17. Purple Loosestrife (Lythrum salicaria) • Perennial • Flowers purple on spikes • Stems are square; plant can be 6-8 feet in height • Reproduces by seed and roots Control: • cut, dig, or hand pull (small plants) • cut and remove the flowering spikes to prevent new seedlings • apply herbicides when actively growing at full to late flowering

  18. Butterfly Bush (Buddleia davidii) • Perennial • Grows up to 6 feet tall • White, pink, violet or blue flowers • Brought to the U.S. as an ornamental; widely planted Control: • hand pull (seedlings) • apply herbicide to cut stumps Note: cutting the plant encourages growth and applying herbicides to leaves is generally ineffective.

  19. Weed treatment in riparian areas • Select the most effective treatment methods for the site • If herbicides are used, be sure the label allows application adjacent to or in the water • Consider wipe application or hand removal

  20. Now what? • Inventory the plants on your property • Identify invasive plants and weeds • Do you have a weed problem? Why? • What can you change about the way you manage your property to decrease the weed population? ENGLISH IVY

  21. Proper disposal of weeds • Put fresh noxious and perennial weed material in your garbage • Don’t add it to your compost bin or yard debris cart; especially seeds or root material • Don’t leave any root parts or seeds in wet areas; they will sprout!

  22. Then... • Determine appropriate controls and your plans for the site and start working • Monitor for invasive plants • Plant native plants in your yard after the weeds are under control • Marion & Polk SWCDs have annual native plant sales in February • Share this information with others

  23. Helpful Resources Pringle Creek Watershed Council…………....503-566-4034 web: www.open.org/pcwc Marion Soil & Water Conservation District….503-391-9927 web: www.open.org/mariswcd Oregon Department of Agriculture…………...503-986-4621 web: www.oregon.gov/ODA OSU Extension - Marion County Office……...503-588-5301 web: extension.oregonstate.edu/marion Pacific NW Weed Control Handbook web: weeds.ippc.orst.edu/pnw/weeds

  24. Helpful Books Weeds of the West Western US Cooperative Extension Services Tom Whitson, Editor; 2001 Northwest Weeds Ronald J. Taylor; 2003 Plants of the Pacific Northwest Coast Jim Pojar and Andy Mackinnon; 1994 Handbook of Northwestern Plants Helen Gilkey and LaRea J. Dennis; 2001 Gardening with Native Plants of the Pacific Northwest Arthur Kruckeberg; 2003 Trees and Shrubs for Pacific Northwest Gardens John Grant, et. al.; 2003

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