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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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Presentation Transcript
slide1

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.
slide2

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
slide3

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)

slide4

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

slide5

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

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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)

slide7

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

slide8

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

slide9

Large Crabgrass (G)

Annual Bluegrass (G)

slide10

Bristly Starbur

Common Beggar’s-Tick

slide11

Rosary Pea

Common Lamb’s-Quarter

slide12

Partridge Pea

Purple Nutsedge

Yellow Nutsedge