There are many methods available to control pest plants. Often one method will not be sufficient to control serious weeds, and integrating several methods over a long period will be more successful. This approach is known as integrated weed management.

1. Weed Control Methods
LNT 136 – Spring 2016
Mark Valen

2. Prevention
• Assess and Monitor
• Prepare the Site
• Redesign
• Avoid New Introductions
• Encourage desirable plants

3. Assess and Monitor
• Soil Conditions
• Exposure
• Shading
• Slope
• Drainage
• Season
• Perennial weeds

4. Site Preparation
• Sheet Mulch

5. Site Preparation
• Cultivation

6. Site Preparation
• Solarization
Limonium ramosissimum ssp. provinciale (Algerian sea lavender)

7. Redesign
• Plant Selection
• Plant Spacing

8. Redesign
• Hardscape

9. Avoid New Introductions
• Nursery Stock
• Soil Ammendments
• Weed disposal
• Neighboring Sites
• Mowers and Equipment
• Exclude Invasive Plants

10. Encourage Desired Plants
• Provide Proper Growth Requirements
• Utilize Mulch
• Preemergence Herbicides

11. Control
• Mechanical
• Biological

12. Mechanical Control
• Hand Pulling

13. Mechanical Control
• Hoeing

14. Mechanical Control
• Mowers and String Trimmers
https://www.youtube.com/watch?v=wgvNAQzxTUk
https://www.youtube.com/watch?v=k0V64Z5z
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15. Mechanical Control
• Flamers and Weed Heaters

16. Mechanical Control
• Hot Water or Steam

17. Mechanical Control
• Mulch
• 4-6” Layer

18. Mechanical Control
• Irrigation

19. Herbicides
• Pay attention to:
• Active Ingredient
• Formulation
• Application Timing
• Mode of Action
• Herbicide blends

20. Herbicides
• Preemergence
• Prevents Germination
• May damage young or recently transplanted plants
• May persist in environment

21. Herbicides
• Postemergence
• Contact
• Leaves and Stems
• Coverage is important
• Effective against Annual Boradleaves

22. Herbicides
• Post Emergence
• Systemic
• Translocated to growing stems and roots
• Perennial weeds
• Timing and Growth Cycle are Important
• Can pass through natural root grafts
One drop of a translocated
herbicide (2,4-D) placed on a
soybean leaf (left) vs
a contact herbicide (right.)

23. Herbicides
• Selectivity
• Nonselective
• Glyphosate
• Soil fumigants
• Selective
• Grasses
• Broadleaf

24. Herbicides
• Natural and Organic Herbicides
• Contact, Non-Selective
• Horticultural Vinegar (Acetic Acid)
• Citric Acid
• Botanical Oils
• Corn Gluten Meal
• Preemergence
• Not recommended

25. Herbicides
• Safe Use and Handling
• Follow the Label Instructions
• Concentrations
• Application
• Wear proper PPE
• Avoid injuring non-target species
• Receive DPR certification
• Minimize risk to groundwater
• Clean equipment after use

26. Herbicides
• Herbicide Resistance
• Tolerance can be useful
• Rotate modes of action
• Maximize reliance on non-chemical methods