United States Department of Transportation
i
Enhancing extension education recommendations to minimize spread of invasive species and establish new grasses for Georgia roadsides : final report.
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2015-05-01
[PDF-3.00 MB]
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Edition:Final report
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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.
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