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Weed Identification Made Easy Chelan County Noxious Weed Department Julie Sanderson, Field Supervisor.

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Presentation on theme: "Weed Identification Made Easy Chelan County Noxious Weed Department Julie Sanderson, Field Supervisor."— Presentation transcript:

1 Weed Identification Made Easy Chelan County Noxious Weed Department Julie Sanderson, Field Supervisor

2 Many options for killing weeds

3 Always use Integrated Weed Management

4 Its The Law (RCW 17-10) Stand-Alone Or Combination Of These Methods: – Prevention – Mechanical – Biological – Chemical – Cultural Control means to prevent all seed production

5 Use the right chemical for the job Before After Bohemian knotweed

6 WEED IDENTIFICATION The first step to integrated weed management is knowing which weed you are trying to control!

7 Whats in a name? Information! Plant family, specific Latin name, common name Life cycle – Is it annual, perennial, biennial? Toxicity information – Can I touch it, what if my dog eats it? Is it allelopathic? Herbicide use- Is it listed on the label, is there resistance? Noxious weed status- Is it listed in my state or county?

8 Know your enemy! Why learn to identify weeds? Knowing the right name allows access to information about the specific plant that needs to be controlled. What information do you need? How does the biology of the plant affect control options? What is the most effective chemical for control? Is the plant listed on the herbicide label? Is there any herbicide resistance known for the plant? Yellow starthistle Centaurea solstitialis

9 Whats in a name? Look alike weeds may require different control methods Do you know which name belongs to each plant? Yellow starthistle Perennial sowthistle Prickly lettuce Rush skeletonweed

10 Whats in a name? Look alike weeds may require different control methods Yellow starthistle Perennial sowthistle Prickly lettuce Rush skeletonweed

11 Whats in a name? Look alike weeds may require different control methods Yellow starthistle Perennial sowthistle Prickly lettuce Rush skeletonweed

12 Whats in a name? Look alike weeds may require different control methods Yellow starthistle Perennial sowthistle Prickly lettuce Rush skeletonweed

13 Whats in a name? Look alike weeds may require different control methods Yellow starthistle Perennial sowthistle Prickly lettuce Rush skeletonweed

14 The 8 Great Things to Notice About Plants Plant Character Analysis 1. Plant Habit 2. Leaf Arrangement 3. Leaf Shape and Texture 4. Inflorescence Type 5.Flower structure 6.Fruit Type 7.Roots and underground structures 8.Other Observations

15 1. Plant Habit

16 2. Leaf arrangement

17 3. Leaf shape and texture

18 4. Inflorescence Type Illustrations by Suzanne McCullough from the Botany Handbook of Florida, 1965 ORH 89-3, Florida Department of Agriculture And Consumer Services, and the Florida Federation of Garden Clubs, Inc. umbel solitary axillaryraceme paniclespike corymb head

19 5. Flower Structure

20 6. Fruit Types Legume Follicle Illustrations by Suzanne McCullough from the Botany Handbook of Florida, 1965 ORH 89-3, Florida Department of Agriculture And Consumer Services, and the Florida Federation of Garden Clubs, Inc.

21 7. Roots and Underground structures RootsRhizomes and Stolons Fibrous Tap root Illustrations by Suzanne McCullough from the Botany Handbook of Florida, 1965 ORH 89-3, Florida Department of Agriculture And Consumer Services, and the Florida Federation of Garden Clubs, Inc.

22 8. Other Observations Unusual odor Sticky texture Plant juice – milky, sticky, viscous, watery Overall color – bright green, gray, yellow Bracts, spines, thorns or hairs Associated insects

23 More look alike weeds And how to tell them apart

24 Knapweeds, which one???

25 Look at the bracts Diffuse knapweed Meadow knapweed Russian knapweed Spotted knapweed All class B noxious weeds

26 Big green brushy looking stuff? Kochia - Class BPigweeds (redroot and white) Lambsquarters Russian thistle

27 Look at the flowers kochia lambsquarters Russian thistle pigweed

28 Tumbleweeds – ready to roll.

29 The term tumbleweed refers to any of several species that disperse seeds by tumbling: Russian thistle Diffuse knapweed Kochia Tumble pigweed (Amaranthus albus)

30 So many thistles, so little time… Canada thistle** Bull thistle** Musk thistle** Scotch thistle** **most common thistles here Plumeless thistle Slenderflower thistle Italian thistle Milk thistle Native thistle (Cirsium undulatum)**

31 Most common thistles Canada thistleBull thistle Musk thistle Scotch thistle Look at a combination of characters: flowers, stems, and leaf surfaces.

32 Canada thistle - Class C Small flowers <1, spineless bracts Smooth spineless stem Green glossy leaves, not hairy, very spiny along margins Class C noxious weed

33 Bull thistle Larger flowers with long spiny bracts Stem spiny, somewhat winged Leaf surface hairy Class C noxious weed

34 Musk thistle Flowers large 1.5-3, broad spiny bracts, artichoke –like Stems spiny somewhat winged Leaves green, not hairy Class B noxious weed

35 Scotch thistle – Class B Flowers 1 -2, narrow spiny bracts Stem spiny, strongly winged Leaves gray-green, with fine wooly hair Class B noxious weed Steve Dewey, Utah State University, Bugwood.org Bonnie Million, National Park Service, Bugwood.org

36 Daisies, we love them, we love them not. English daisy Oxeye daisyScentless mayweed Stinking mayweed

37 Daisies with finely divided leaves Stinking mayweed Scentless mayweed – Class C

38 Daisies with oval, toothed basal leaves English daisy Oxeye daisy – Class C

39 Other Ways to Identify Weeds Use reference books Use online resources Ask someone who knows weeds

40 Weed Identification Made Easy??? Chelan County Noxious Weed Department Julie Sanderson, Field Supervisor (Well…a little easier, I hope)

41 Thanks to Bugwood.org for the use of photos and figures: Image NumberCitaton Julia Scher, USDA APHIS PPQ, Bugwood.org USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org Cindy Roche, Bugwood.org Forest & Kim Starr, Starr Environmental, Bugwood.org Joseph M. DiTomaso, University of California - Davis, Bugwood.org John M. Randall, The Nature Conservancy, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Robert Vidéki, Doronicum Kft., Bugwood.org Bonnie Million, National Park Service, Bugwood.org 24090Sara Rosenthal, USDA Agricultural Research Service, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Steve Dewey, Utah State University, Bugwood.org 21042Eric Coombs, Oregon Department of Agriculture, Bugwood.org Cindy Roche, Bugwood.org Steve Dewey, Utah State University, Bugwood.org Steve Dewey, Utah State University, Bugwood.org John M. Randall, The Nature Conservancy, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Mary Ellen (Mel) Harte, Bugwood.org Peggy Greb, USDA Agricultural Research Service, Bugwood.org Dave Powell, USDA Forest Service, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Steve Dewey, Utah State University, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Loke T. Kok, Virginia Polytechnic Institute and State University, Bugwood.org Steve Dewey, Utah State University, Bugwood.org Dan Tenaglia, Missouriplants.com, Bugwood.org Ricky Layson, Ricky Layson Photography, Bugwood.org Mary Ellen (Mel) Harte, Bugwood.org Loke T. Kok, Virginia Polytechnic Institute and State University, Bugwood.org Robert Vidéki, Doronicum Kft., Bugwood.org Steve Dewey, Utah State University, Bugwood.org Bonnie Million, National Park Service, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Montana Statewide Noxious Weed Awareness and Education Program Archive, Montana State University, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Richard Old, XID Services, Inc., Bugwood.org Caleb Slemmons, University of Maine, Bugwood.org Michael Shephard, USDA Forest Service, Bugwood.org Steve Dewey, Utah State University, Bugwood.org Richard Old, XID Services, Inc., Bugwood.org


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