Using a combination of a primary growth retardant, mefluidide, a synergistic additive, chlorsulfuron, a detergent to enhance penetration (X-77) and a herbicide, 2,4-D, to provide for control of broadleaf weeds, full season management of bluegrass-tall fescue mixtures along roadsides has been achieved. A single spray application is made in the spring and no additional herbicide applications or mechanical mowing are needed. The treatment is effective with greater than 90% control of fescue seedheads. Those few seedheads that do form remain short. It is economical. The costs of materials and application are equal to or less than the cost of a single mowing cycle. The treatment is environmentally safe when aplied in early spring before most agricultural crops have been planted. The effectiveness and low cost of the combination derives from laboratory and greenhouse observations that various materials, herein referred to as additives, often only weakly effective as growth retardants themselves, will interact synergistically with mefluidide to provide overall treatment effectiveness at application rates that are economical. Using this principle, a combinatin suitable for roadside vegetation management was devised, field tested for two years under actual use conditions, and found to be effective for full season vegetation management of mixed bluegrass-tall fescue turf to permit considerable cost savings when compared to 3-cycle mechanical mowing.

  • Supplemental Notes:
    • Prepared in cooperation with the Federal Highway Administration on HPR Part II Study, Cost Reduction and Increased Efficacy of Growth Retardant Mixtures for Vegetation Management Along Indiana Roadsides.
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284

    Indiana Department of Highways

    Indianapolis, IN  United States 

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Morre, D J
  • Publication Date: 1985-1-30

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 136 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00399501
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-IN-JHRP-85-1 Intrm Rpt.
  • Contract Numbers: 1(21) Part II
  • Created Date: Mar 31 1988 12:00AM