Permit required from county agricultural commissioner for purchase or use. Gibeault (emeritus), Botany and Plant Sciences, UC Riverside, Sensitivity of Turf Species to Herbicides, – Susceptibility of Weeds to Herbicide Control. Common or prostrate knotweed, or Polygonum arenastrum, also known as wiregrass, wireweed, matweed or doorweed, grows flat, spreading outward in a dense circular form that can reach 18 inches across with a narrow taproot that can grow as deep. Prostrate Knotweed growth habit. © 1996–2020 Statewide IPM Program, Agriculture and Natural Resources, University of California Regents of the University of California unless otherwise noted. Prostrate knotweed. — Read our For post-emergence control many broadleaf herbicides are effective. Similar Products. It can grow in … Figure 6. Celsius WG (thiencarbazone + iodosulfuron + dicamba) should be effective on prostrate knotweed. Henbit (below) is a cool-season winter annual germinating in the fall, flowering and setting seed in spring, and dying with summer heat. The reddish or green prostrate stems form a mat-like growth which often chokes out desirable turfgrasses. This publication printed on: Dec. 21, 2020, NC Chemical control: 2,4-D by itself will provide only fair control of prostrate knotweed, but when combined with triclopyr (Turflon Ester Ultra or Triclopyr 4) or dicamba (Banvel, Vanquish), it should provide excellent control in cool-season turf. Wilen, UC IPM and UC Cooperative Extension San Diego County, M. LeStrange (emeritus), UC Cooperative Extension Tulare County, M.A. 4-Speed™ XT. What We Like. Japanese knotweed spreads relentlessly and grows back year after year, meaning you should use a multifaceted approach to eradicate it from your lawn or garden. share. Perennial broadleaf weeds can be controlled with an application of a broadleaf herbicide in the fall (late . include Tenacity (mesotrione) or Segment (sethoxydim) in centipedegrass. So in the case of severe infestation, products that contain triclopyr (e.g., T-Zone, Battleship III, 4-Speed XT, Cool Power, others) will provide more control. It’s working faster than I’ve experienced before. On page 205, Blair states, “ [Prostrate] Knotweed can grow in very inhospitable soils, including those that have been contaminated by petroleum products and mine tailings. Postemergence home­ owner products that contain quinclorac include Ortho ® Weed­B­Gon Weed Killer for Lawns Plus Crabgrass Control Concentrate, Bayer Tenacity doing its thing. Solitare Herbicide. A second application at a reduced rate may be necessary for season-long control. Japanese knotweed – by this stage its stems have lost succulence and become too fibrous to be worth processing “Weed” (n): Any plant that has mastered every aspect of survival except growing in neat rows. 4-Speed® XT herbicide provides fast, effective post-emergent control of a wide range of broadleaf weeds… Show more . knotweed, prostrate — — — — — C: C: N: C: N ... (Tenacity) 24A* = 2,4-D amine: DIC* = dicamba (Banvel) MSM = MSMA: 24E* = 2,4-D ester: ETH = ethofumesate (PoaConstrictor, Prograss) PEX = penoxsulam (Sapphire) FLU = fluazifop (Fusilade II) PRO = pronamide (Kerb) FLX = fluroxypyr (Vista) QUI = quinclorac (Drive) UC IPM Pest Management Guidelines: Turfgrass UC ANR Publication 3365-T . Big bang for your buck; Works on all types of grass lawns; Liquid formula is easy to use; Specs. Other perennial weeds may be more visible in the summer if they thrive on warm temperatures like yellow nutsedge making them more visible during periods of slow turf growth. 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