Enhancing extension education recommendations to minimize spread of invasive species and establish new grasses for Georgia roadsides : final report.

Details

• Creators:
  McCullough, Patrick ; Shilling, Donn
• Corporate Creators:
  University of Georgia
• Corporate Contributors:
  Georgia. Dept. of Transportation. Office of Research ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Grasses
  • Herbicides
  • Invasive plants
  • Mowing
  • Roadside flora
  • Seeding
  • Imazapic
  • sod
  • turfgrass
  • seed
• Publication/ Report Number:
  FHWA-GA-16-1237
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Georgia
• Edition:
  Final report
• Corporate Publisher:
  Georgia. Dept. of Transportation. Office of Research
• Abstract:
  Current DOT management practices could be contributing to the release of invasive ; weeds, such as broomsedge and vaseygrass, on Georgia roadsides. The herbicide imazapic, used to ; reduce mowing requirements of roadside grasses, injured bermudagrass twice as much as broomsedge, ; an invasive species, in greenhouse experiments. Imazapic provided no control of broomsedge in the ; field. MSMA applied in fall provided good control of broomsedge for 1 year after initial treatment. ; However, imazapic tank-mixed with MSMA provided less control than MSMA alone, suggesting ; imazapic antagonizes efficacy of MSMA on broomsedge. The new herbicides Derigo and Pastora ; controlled or suppressed vaseygrass populations when applied in late spring. However, these ; herbicides did not control broomsedge. MSMA will need to be applied in sequential programs when ; ALS inhibitors are used for other controlling other weeds or for growth regulation of roadside grasses. ; Introducing new grasses for roadside vegetation could reduce the spread of invasive weeds and ; enhance management. Centipedegrass and zoysiagrass have potential to establish under roadside ; conditions as alternatives to bermudagrass and fescue in Georgia. These grasses effectively ; established when planted from sod or plugs. Centipedegrass was the quickest grass to establish from ; sod. Growth of centipedegrass was comparable to zoysiagrass from plugs, and both species were ; more competitive than bermudagrass under guardrails. None of the grasses established from seed ; under simulated roadside conditions. Significant differences in vaseygrass germination were detected ; by location. Vaseygrass seed germinated in June from collections in south Georgia. Seed germination ; was detected from July to November in Newnan, but other locations had minimal germination in fall. ; These results suggest that mowing operations could spread significant amounts of viable seed ; throughout the state from June to November.
  More +
• Format:
  PDF
• Funding:
  0011852
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31146/dot_31146_DS1.pdf
• File Type:
  [PDF - 3.00 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:fb0d5fbe88fa1cae88bb67b430d01e733981f77ea534a5795eac482820b8bbf0