Weed Identification and Control. Jim Wanstall NMDA State Noxious Weed Coordinator

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1 Weed Identification and Control Jim Wanstall NMDA State Noxious Weed Coordinator

2 What Is A Weed? A weed is any plant that interferes with the management objectives for a particular site. An invasive weed is a plant that has the ability or tendency to spread and invade a variety of habitat types.

3 The Term NOXIOUS WEED Is A Legal Term Indicating... A plant species that is not indigenous to New Mexico and that has been targeted pursuant to New Mexico s Noxious Weed Management Act of 1998 for management or control because of its negative impact on the economy or the environment.

4 New Mexico s Noxious Weed List Class A Weeds: Not currently in NM or limited distribution. Class B Weeds: Limited to a particular area in NM. Class C Weeds: Widespread throughout NM. Watch List: Species of concern, that have the potential to become problematic. More data is needed.

5 State Noxious Weed List Contains 45 species Updated April 2009

6 Management and Control. What s The Answer?

7 What is Your Objective? Obviously You Want to Kill the Weed

8 Short Term vs Long term Objectives

9 Short Term vs Long term Objectives

10 Short Term vs Long Term Considerations Vary with the size and severity of the problem Small patches and individual plants can be as simple as kill the plants It may only require a short term view Larger infestations are much different

11 Plants out compete other plants for available sites. The system is dynamic, not static.

12 Long Term Objectives Require an Understanding of Vegetation Dynamics

13 Succession

14 Noxious weeds are so aggressive they throw this successional system into disorder. The only component in this model that can shift the plant community in a desirable direction is successional tendency

15 Noxious weeds are early successional species within an available site. But because of their tenacious character, they can stop succession to a more desirable site plant community.

16 Moving Succession Along Designed Disturbance = Create available sites Controlled Colonization = Create conditions that favor the plants you want Controlled Performance = Encourage the growth of desired plants

17 Beginning Plant Community 98% Russian knapweed 2% Cheatgrass Designed Disturbance Broadleaf Herbicide Controlled Colonization Biological Control Controlled Performnce Mowing Cultivation Mowing Fertilization Irrigation Seeding Herbicide Grazing Fertlization Irrigation Burning Grazing Reducing soil Fertitility Non- Selective Herbicide Flooding and Draining Herbicide irrigation Burning Early Spring Grazing Biological Control Ending Plant Community 70% seeded species 20% cheatgrass 10% Russian knapweed

18 Integrated Pest Management Control Options 1. Cultural planting desirable competitive plants, keeping country in good shape, etc. 2. Mechanical mowing, burning, hoeing, hand pulling, etc. 3. Biological the use of livestock, insects, or pathogens 4. Chemical the use of herbicides

19 Identifying Plant Biology The key to successful control

20 Types of Weed Species Grassy has a fibrous root system Example: Johnson grass Broadleaf any weed that is not a grass. Woody plants can be considered broadleaf. Example: Cocklebur Woody - A. Brush/shrub multi-stem Example: mesquite, scrub oak B. Trees single stem (trunk) Example: salt cedar, elm

21 Classification of Weeds Based on Their Life Cycle Annual Weeds complete their life cycle in one growing season. The plants come up from seed, grow, flower, produce seed, then die all in one growing season. Means of reproduction: Seed production The KEY To Control: DO NOT ALLOW THE PLANT TO SET SEED!

22 Annuals Summer annuals: Annuals that germinate in spring and flower in summer to fall. Examples: Puncture vine, Foxtail Winter annuals: Annuals that germinate in the fall/early winter and flower in spring. Examples: Cheatgrass, London rocket

23 Classification of Weeds Based on Their Life Cycle Biennial Weeds complete their life cycle in two years. These plants come up from seed, produce a rosette the first year, go through the winter (overwinter) as a rosette. During the second growing season, the plant produces a stem, flowers, seed, then dies. The KEY to control: DO NOT ALLOW THE PLANT TO SET SEED!

24 Scotch, musk and bull thistles

25

26 Classification of Weeds Based on Their Life Cycle Perennial Weeds come back year after year from the same vegetative reproductive root systems or stolons (runners). 1. Simple perennial non-branching root system. Example: dandelion 2. Creeping perennial branching root system. Example: field bindweed Management must strive to kill the root system while not allowing the plant to produce seed.

27

28 Weed Identification is Important! Management techniques are specific for specific species. Identify both seedlings and mature plants. Note characteristics to consider management techniques. Utilize weed identification books if needed. Weeds of the West, Troublesome Weeds of N.M.

29 Interactive Weed ID Tool Simple tool for common weeds of New Mexico and the southwest. Asks a series of questions about plants. Fill in what you know Results will be a list of potential plants with thumbnail pictures of plants.

30 Noxious Weeds in Southern New Mexico

31 Russian Knapweed Perennial with widely spreading root system. Emits an allelopathic substance. Toxic to horses. Management plan should include a combination of control methods to stress the plant.

32 Rounded and papery bracts.

33 Roots have been observed to grow 6 to 8 feet deep in one season, and a single plant can expand radially up to 14 yards in two seasons

34

35 Hoary Cress A perennial. Leaves are clasping Produces by seed and creeping roots. Apply herbicides before flowering.

36

37 Hoary Cress-- The problem with treating this plant is that comes out and blooms very early in the spring!

38 Perennial Pepperweed

39 Perennial Pepperweed Creeping herbaceous perennial Found mostly in riparian areas, irrigation ditches, floodplains, and wetlands. Perennial roots, root fragments, and seed reproduction New shoots can spread more than 10 feet from the parent plant each year.

40 Perennial pepperweed Height of up to 6 feet tall. Non-clasping leaves that are lance-shaped. Small, white-petaled flowers in dense, rounded clusters at the end of the branches.

41

42 Malta starthistle Winter Annual Stiff, wiry stems, 1 to 3 feet tall. Leaves are green to blue-green, covered with fine hairs. Basal leaves are oval to linear, entire to lobed margins. Stem leaves are narrow, with bases that extend down the stem creating wings. Oval yellow flower heads are single or in groups of 2 to 3 at the ends of stems with stiff purple or brown bracts James M. Andre

43

44 Yellow vs Malta

45 African rue Small, bright green succulent perennial herb. Flowers have five white petals and produce a cylindrical 2-4 celled fruit with many seeds. Toxic to cattle, sheep, and horses. Seeds are the most toxic part of the plant CDFA

46 2001 CDFA 2001 CDFA 2001 CDFA

47 Contact Me Jim Wanstall NMDA State Noxious Weed Coordinator P.O Box 464 Tome, N.M (505)

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