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Louisiana Yards and Neighborhoods
Louisiana Yards and Neighborhoods
Weed ManagementWeed Management
www.lsuagcenter.com/lyn
WeedsWeeds
• Plants growing out of place
• Compete with lawns and landscape
• Water • Nutrients • Light
• Plants growing out of place
• Compete with lawns and landscape
• Water • Nutrients • Light
DandelionDandelion
ThistleThistle
Common chickweedCommon chickweed
Types of Weeds Types of Weeds • Broadleaves
– Netted veination
– 2 cotyledons
– Taproot
– Showy flowers
• Grasses
– Parallel
– 1 cotyledon
– Fibrous roots
• Sedges
– “Nutgrass”
– Triangular stems
– Leaves in 3s
• Broadleaves
– Netted veination
– 2 cotyledons
– Taproot
– Showy flowers
• Grasses
– Parallel
– 1 cotyledon
– Fibrous roots
• Sedges
– “Nutgrass”
– Triangular stems
– Leaves in 3s
White cloverWhite clover
DallisgrassDallisgrass
Purple nutsedgePurple nutsedge
Why So Many Weeds?Seed Production
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 – annual broadleaf• 13,000 – 100,000 seeds/year• Dormancy – survive 30 years• Don’t allow seed production
PigweedPigweed Pigweed - heavy seed producer Pigweed - heavy seed producer
How Do Weeds Spread?How Do Weeds Spread?
1) Nature• Animals and birds• Winds – dandelion• Rains and flooding• Some type of runner – rhizome, stolon
2) Humans• Impure seed/sod• Compost and mulch• Machinery – contaminated mowing equipment• Contaminated soil
1) Nature• Animals and birds• Winds – dandelion• Rains and flooding• Some type of runner – rhizome, stolon
2) Humans• Impure seed/sod• Compost and mulch• Machinery – contaminated mowing equipment• Contaminated soil
Weeds in Lawns & LandscapeWeeds in Lawns & Landscape
• Host for diseases
• Insects
• May cause allergies in humans
• Host for diseases
• Insects
• May cause allergies in humans
Poison ivyPoison ivy
Indicator WeedsIndicator Weeds
Soil condition• Soil compaction• Low nitrogen• Poor drainage
Soil condition• Soil compaction• Low nitrogen• Poor drainage
Indicator weeds• Goosegrass, annual
bluegrass• Clovers• Dollarweed, sedges,
doveweed
Indicator weeds• Goosegrass, annual
bluegrass• Clovers• Dollarweed, sedges,
doveweed
Annual bluegrassAnnual
bluegrass White cloverWhite clover DollarweedDollarweed DoveweedDoveweed
Cultural Practices That Improve Turf & Ornamentals
Cultural Practices That Improve Turf & Ornamentals
Discourage competition from weeds
Discourage competition from weeds
Virginia ButtonweedVirginia Buttonweed
• #1 weed in lawns
• Perennial
• Common in lawns mowed too low
• Highly drought-tolerant
• Reproduces by seed, stem fragments, etc.
• #1 weed in lawns
• Perennial
• Common in lawns mowed too low
• Highly drought-tolerant
• Reproduces by seed, stem fragments, etc.
DallisgrassDallisgrass• Perennial - stubby
rhizomes
• Common throughout the South
• Tolerates low mowing and drought
• More cold-tolerant than lawn grasses
• Perennial - stubby rhizomes
• Common throughout the South
• Tolerates low mowing and drought
• More cold-tolerant than lawn grasses
ChamberbitterChamberbitter
• Summer annual
• Reproduces by seed
• Each fruit contain 6 seeds
• Quite common in flower beds
• Summer annual
• Reproduces by seed
• Each fruit contain 6 seeds
• Quite common in flower beds
DollarweedDollarweed
• Perennial
• Reproduces by seed and rhizomes
• Common in wet areas
• Infests thin lawns
• Perennial
• Reproduces by seed and rhizomes
• Common in wet areas
• Infests thin lawns
Florida BetonyFlorida Betony• Perennial plant
• Very invasive weed in landscapes
• Square stem
• White to pink flowers
• Reproduces quickly by tubers and seeds
• Perennial plant
• Very invasive weed in landscapes
• Square stem
• White to pink flowers
• Reproduces quickly by tubers and seeds
Weed ManagementWeed Management
• Proper lawn and landscape cultural practices first
• Identify weeds
• Calibrate sprayers and spreaders
• Read and understand herbicide labels
• Proper lawn and landscape cultural practices first
• Identify weeds
• Calibrate sprayers and spreaders
• Read and understand herbicide labels