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2006 Louisiana Suggested Weed Control Guide

Control Options for Troublesome Weeds in Home Lawns

Winter Weed Management Weed (s) (s) Trade Name (s) Comments Preemergence annual and Greenlight Crabgrass Preventer; Apply in late bluegrass, chickweed, benefin; Sta-Green Crab-ex ,Hi-Yield September to early-October henbit control for all dithiopyr; Dimension or Greenlight Crabgrass prior to annual bluegrass established southern lawns. Preventer 2; Scott’s Halts germination. Granular products applied with rotary or drop spreaders. See label for correct spreader settings. Preemergence winter isoxaben Greenlight Portrait Apply Portrait (granular broadleaf weeds control herbicide) in late September including lawn burweed. to early-October before Safe for all established winter broadleaf weeds southern grasses. germinate. Provides no grass control. Safely applied under most established trees when used as directed. See label for correct spreader settings. Preemergence and early liquid Various atrazine sources including Apply spray in November. postemergence annual Southern Ag and Hi-Yield Do not apply under the bluegrass, lawn burweeed dripline of trees and shrubs. and many winter Consider reapplication in broadleaves in February. centipedegrass, St. Augustinegrass, zoysia, and dormant Bermuda. Postemergence control of 2,4-D + Bayer Advanced Southern Apply spray to young most winter broadleaf + Broadleaf Weed Killer, Ortho Weed emerged weeds from weeds including lawn or B Gon, SpectricideWeed Stop 2x, or November to March. Better burweed in all southern 2,4-D + Ferti-lome Weedfree Zone activity at temperatures lawns. mecoprop + above 60 F. Reapplication dicamba + may be necessary. Observe carfentrazone label precautions. Summer Weed Management Summer Grasses Preemergence crabgrass trifluralin and Greenlight Crabgrass Preventer; Apply herbicides in late and goosegrass control for benefin; Sta-Green Crab-ex, Greenlight February in north LA and all established southern dithiopyr; Crabgrass Preventer 2, Hi-Yield mid-February in south LA lawns pendimethalin Dimension; Scott’s Halts prior to crabgrass germination. Granular products applied with rotary or drop spreaders. See label for correct spreader settings. Postemergence metsulfuron Manor, Blade Product is very effective on bahiagrass control in Pensacola bahiagrass. bermuda, centipede, St. Product is not widely Augustine, and zoysia available. Consider internet sources. Postemergence crabgrass, MSMA MSMA Contact type herbicide that bahiagrass, dallisgrass usually requires a follow-up control in bermudagrass application within 10 days. and zoysiagrass Early postemergence dithiopyr Sta-Green Crab-ex, Hi-Yield Effective when applied crabgrass control in St. Dimension, Greenlight Crabgrass before crabgrass tillers or up Augustinegrass Preventer 2 – products with to 2 - 3 weeks after dithiopyr germination. Apply February to late March. 2006 Louisiana Suggested Weed Control Guide

Summer Grasses Postemergence control of Vantage Reapplication may be annual grasses, necessary. Will not control bahiagrass, bermudagrass annual bluegrass or and dallisgrass in torpedograss. Use only in centipedegrass. centipedegrass. Non-selective spot Roundup, Hi-Yield, Eraser, No other dallisgrass control treatment of dallisgrass in Greenlight Com-plete, Eliminator option for homeowners with St. Augustinegrass etc. - all 41% glyphosate products St. Augustinegrass. Spot treatment of dallisgrass clumps. All contacted St. Augustinegrass will be killed. Consider wiping treatments for more precise applications. Non-selective spot glyphosate Roundup, Hi-Yield, Eraser, No other torpedograss treatment of torpedograss Greenlight Com-plete, Eliminator control option for in centipedegrass etc. - all 41% glyphosate products homeowners with centipedegrass Spot application to torpedograss. All contacted centipedegrass will be killed. Consider wiping treatments for more precise applications. Broadleaves Postemergence 2,4-D + Ferti-lome Weedfree Zone Reapplication may be dollarweed and dichondra mecoprop + necessary within 2 weeks. control in all southern lawns dicamba + Observe temperature carfentrazone precautions concerning St. Augustinegrass and centipedegrass. Postemergence atrazine Southern Ag, Hi-Yield or Scott’s Use either liquid atrazine or dollarweed and dichondra Weed & Feed and various brands weed & feed containing control in centipedegrass, atrazine. Reapplication may St. Augustinegrass, and be necessary. Observe all zoysiagrass label precautions. Do not apply to actively growing bermudagrass. Postemergence control of 2,4-D + Bayer Advanced Southern Observe temperature lespedeza, clover, spurge, mecoprop + Broadleaf Weed Killer, Ortho Weed precautions concerning St. wild strawberry in all dicamba or B Gon, SpectricideWeed Stop 2, or Augustinegrass and southern lawns. 2,4-D + Ferti-lome Weedfree Zone centipedegrass. mecoprop + Reapplication may be dicamba + necessary in 2 to 4 weeks. carfentrazone Postemergence Metsulfuron Manor Metsulfuron provides good suppression of Virginia control with less turf injury buttonweed in all southern than 2,4-D containing lawns. products. Professional product that may not be readily available. Consider internet sources. Postemergence 2,4-D + Ferti-lome Weedfree Zone Reapplication may be suppression of Virginia mecoprop + necessary within 2 -3 weeks. buttonweed in all southern dicamba + Observe temperature lawns. carfentrazone precautions. Sedges Postemergence control of halosulfuron; Manage; Image Effective herbicides for purple and yellow nutsedge imazaquin nutsedge control. Safe on in all southern lawns. lawns when applied as directed. 2006 Louisiana Suggested Weed Control Guide

The following tables are herbicide rates for the herbicides mentioned previously. Please refer to product labels for specific weed spectrums, applicator settings, techniques, and precautions.

Herbicide Herbicide Rates for the Most Common Lawn Species in Louisiana Preemergence Bermudagrass Centipedegrass St. Augustinegrass Zoysiagrass Atrazine 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 (dormant bermuda) Greenlight Crabgrass Preventer 2.8 lb/1000 ft2 2.8 lb/1000 ft2 2.8 lb/1000 ft2 2.8 lb/1000 ft2 Greenlight Crabgrass Preventer 2 2.4 to 4.6 lb/1000 ft2 2.4 to 4.6 lb/1000 ft2 2.4 to 4.6 lb/1000 ft2 2.4 to 4.6 lb/1000 ft2 Greenlight Portrait 4.6 to 5.7 lb/1000 ft2 4.6 to 5.7 lb/1000 ft2 4.6 to 5.7 lb/1000 ft2 4.6 to 5.7 lb/1000 ft2 Hi-Yield Dimension 4.0 lb/1000 ft2 4.0 lb/1000 ft2 4.0 lb/1000 ft2 4.0 lb/1000 ft2 Scott’s Halts 2.0 lb/1000 ft2 2.0 lb/1000 ft2 2.0 lb/1000 ft2 2.0 lb/1000 ft2

2006 Louisiana Suggested Weed Control Guide

Herbicide Rates for the Most Common Lawn Species in Louisiana Postemergence Bermudagrass Centipedegrass St. Augustinegrass Zoysiagrass

Atrazine 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 (dormant bermuda)

Bayer Advanced Southern 2.0 oz/gallon/500 ft2 1.0 oz/gallon/500 ft2 1.0 oz/gallon/500 ft2 2.0 oz/gallon/500 ft2 Broadleaf Weed Killer

Image 3.75 oz/gallon/1000 ft2 3.75 oz/gallon/1000 ft2 3.75 oz/gallon/1000 ft2 3.75 oz/gallon/1000 ft2

Ortho Weed B Gon 2 oz/gallon/400 ft2 1 oz/gallon/400 ft2 1 oz/gallon/400 ft2 2 oz/gallon/400 ft2

Ortho Weed B Gon Max 1 oz/gallon/500 ft2 Do not use Do not use 1 oz/gallon/500 ft2

Ferti-lome Weedfree Zone 2 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2 1.5 oz/gallon/1000 ft2

Manor 0.01 oz/gallon/1000 ft2 0.01 oz/gallon/1000 ft2 0.01 oz/gallon/1000 ft2 0.01 oz/gallon/1000 ft2

Manage 1 packet/gallon/1000 ft2 1 packet/gallon/1000 ft2 1 packet/gallon/1000 ft2 1 packet/gallon/1000 ft2

MSMA 1 oz/gallon/1000 ft2 Do not use. Do not use. 1 oz/gallon/1000 ft2

Spectracide Weed Stop 2X 2 oz/gallon/1000 ft2 2 oz/gallon/1000 ft2 2 oz/gallon/1000 ft2 4 oz/gallon/1000 ft2