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Louisiana Yards and Neighborhoods

www.lsuagcenter.com/lyn. Louisiana Yards and Neighborhoods. Weed Management. Weeds. Plants growing out of place Compete with lawns and landscape Water Nutrients Light. Common chickweed. Thistle. Dandelion. Types of Weeds. Broadleaves Netted veination 2 cotyledons Taproot

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Louisiana Yards and Neighborhoods

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  1. www.lsuagcenter.com/lyn Louisiana Yards and Neighborhoods Weed Management

  2. Weeds • Plants growing out of place • Compete with lawns and landscape • Water • Nutrients • Light Common chickweed Thistle Dandelion

  3. Types of Weeds • Broadleaves • Netted veination • 2 cotyledons • Taproot • Showy flowers • Grasses • Parallel • 1 cotyledon • Fibrous roots • Sedges • “Nutgrass” • Triangular stems • Leaves in 3s White clover Dallisgrass Purple nutsedge

  4. Why So Many Weeds?Seed Production • Pigweed – annual broadleaf • 13,000 – 100,000 seeds/year • Dormancy – survive 30 years • Don’t allow seed production Pigweed Pigweed - heavy seed producer

  5. How Do Weeds Spread? • Nature • Animals and birds • Winds – dandelion • Rains and flooding • Some type of runner – rhizome, stolon • Humans • Impure seed/sod • Compost and mulch • Machinery – contaminated mowing equipment • Contaminated soil

  6. Weeds in Lawns & Landscape • Host for diseases • Insects • May cause allergies in humans Poison ivy

  7. Soil condition Soil compaction Low nitrogen Poor drainage Indicator weeds Goosegrass, annual bluegrass Clovers Dollarweed, sedges, doveweed Indicator Weeds Annual bluegrass White clover Dollarweed Doveweed

  8. Cultural Practices That Improve Turf & Ornamentals Discourage competition from weeds

  9. Virginia Buttonweed • #1 weed in lawns • Perennial • Common in lawns mowed too low • Highly drought-tolerant • Reproduces by seed, stem fragments, etc.

  10. Dallisgrass • Perennial - stubby rhizomes • Common throughout the South • Tolerates low mowing and drought • More cold-tolerant than lawn grasses

  11. Chamberbitter • Summer annual • Reproduces by seed • Each fruit contain 6 seeds • Quite common in flower beds

  12. Dollarweed • Perennial • Reproduces by seed and rhizomes • Common in wet areas • Infests thin lawns

  13. Florida Betony • Perennial plant • Very invasive weed in landscapes • Square stem • White to pink flowers • Reproduces quickly by tubers and seeds

  14. Weed Management • Proper lawn and landscape cultural practices first • Identify weeds • Calibrate sprayers and spreaders • Read and understand herbicide labels

  15. www.lsuagcenter.com/lyn Louisiana Yards and Neighborhoods Weed Management

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