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Weed Management in Landscape

Weed Management in Landscape. Weed ? . Weeds are unwanted plants that have detrimental economic, ecological, or health effects on the growth and yield of a crop. Weed can . Reduce crop quality and yield Compete for water, nutrients, space, and sunlight

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Weed Management in Landscape

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  1. Weed Management in Landscape Weed ? • Weeds are unwanted plants that have detrimental economic, ecological, or health effects on the growth and yield of a crop.

  2. Weed can • Reduce crop quality and yield • Compete for water, nutrients, space, and sunlight • Harbor pests and pathogens • Increase harvesting costs • When shipped with plants, the retail sales revenue drop down • Some weeds can kill a host plant

  3. Types of Weeds 1. Annual Weeds (A) a. Annual Grasses (G) b. Annual Broadleaf Weeds (B) 2. Perennial Weeds (P) 3. Aquatic Weeds (Aq) 4. Biennial (Bi) 5. Sedge (s) 6. Lower plant forms, bryophyte (L)

  4. Weed Management 1. Scouting and Monitoring - Scout in and around the planted areas - Monitor weeds at least two seasonsFall or Winter annual weeds (Fall) Summer annuals or perennials (Spring) - Divide areas into Pest Management Units - Map the location of PMU’s - Estimate the weed density before and after control measures - Maintain records

  5. Weed Management 2. Weed Management Before Planting - Choose a weed-free growing site (?) - Prepare the site well (cultivation, deep tillage, soil solarization, steam rakes, or fumigation in combination with cultivation) - Sanitation and exclusion control weed (seed) dispersal agents such as wind, water, tools, people, vehicles etc. follow sanitary practices while planting consider planting hedgerows or fences

  6. 2. Weed Management Before Planting - Planting adjustments establish a crop canopy that quickly shades soil and out competes weeds - Fumigation (Soil Fumigation) chemical fumigants (methyl bromide) widely used for pest/pathogen management toxic to animals/humans, longer re-entry period, residual effects consider alternatives to fumigants dazomet (Basamid) and metam sodium (Vapam)

  7. 2. Weed Management Before Planting - Preemergence Herbicides relatively inexpensive and safe applied before planting but kills germinating seedlings for weeks after application absorbed through roots, may kill the root growing point or through translocation mostly placed on the surface and watered in by sprinklers or rainfall applied under or on top of mulch, and to bare soil around planting areas

  8. 2. Weed Management Before Planting - Preemergence Herbicides crop species tolerance to herbicides varies some preemergence herbicides may retard root growth of the host plant (herbaceous species) residual effects can affect root growth in herbaceous species avoid using preem herbicides in annuals READ THE LABELS

  9. Large Crabgrass (G) Annual Bluegrass (G)

  10. Bristly Starbur Common Beggar’s-Tick

  11. Rosary Pea Common Lamb’s-Quarter

  12. Partridge Pea Purple Nutsedge Yellow Nutsedge

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