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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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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 • Showy flowers • Grasses • Parallel • 1 cotyledon • Fibrous roots • Sedges • “Nutgrass” • Triangular stems • Leaves in 3s White clover Dallisgrass Purple nutsedge
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
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
Weeds in Lawns & Landscape • Host for diseases • Insects • May cause allergies in humans Poison ivy
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
Cultural Practices That Improve Turf & Ornamentals Discourage competition from weeds
Virginia Buttonweed • #1 weed in lawns • Perennial • Common in lawns mowed too low • Highly drought-tolerant • Reproduces by seed, stem fragments, etc.
Dallisgrass • Perennial - stubby rhizomes • Common throughout the South • Tolerates low mowing and drought • More cold-tolerant than lawn grasses
Chamberbitter • Summer annual • Reproduces by seed • Each fruit contain 6 seeds • Quite common in flower beds
Dollarweed • Perennial • Reproduces by seed and rhizomes • Common in wet areas • Infests thin lawns
Florida Betony • Perennial plant • Very invasive weed in landscapes • Square stem • White to pink flowers • Reproduces quickly by tubers and seeds
Weed Management • Proper lawn and landscape cultural practices first • Identify weeds • Calibrate sprayers and spreaders • Read and understand herbicide labels
www.lsuagcenter.com/lyn Louisiana Yards and Neighborhoods Weed Management