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 Imazapic Invasive Plants Mowing Roadside Flora Seed Seeding Sod Turfgrass
• 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.
  
  
• Format:
  PDF
• Funding:
  0011852
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:fb0d5fbe88fa1cae88bb67b430d01e733981f77ea534a5795eac482820b8bbf0
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31146/dot_31146_DS1.pdf
• File Type:
  [PDF - 3.00 MB ]