Natalgrass Rhynchelytrum repens syn. Melinis repens (Willd.) Poaceae.

Presentation on theme: "Natalgrass Rhynchelytrum repens syn. Melinis repens (Willd.) Poaceae."— Presentation transcript:

1 Natalgrass Rhynchelytrum repens syn. Melinis repens (Willd.) Poaceae

2 Biology Native to AfricaNative to Africa Introduced as a forage species in late 1800’s in Florida, but poor quality precluded widespread useIntroduced as a forage species in late 1800’s in Florida, but poor quality precluded widespread use Can be classified as a short-lived perennial grassCan be classified as a short-lived perennial grass

3 Distribution and Impacts Found throughout much of central and south FloridaFound throughout much of central and south Florida Prefers dry soils, waste lands and perennial cropsPrefers dry soils, waste lands and perennial crops Readily infests abandoned areas, roadsides, unimproved pasturesReadily infests abandoned areas, roadsides, unimproved pastures Displaces native vegetation, prevents natural successionDisplaces native vegetation, prevents natural succession

4 Natalgrass Distribution in Florida

5 Identification

6 Mature Plant Perennial grass, 1 to 3 feet tallPerennial grass, 1 to 3 feet tall Bunch-type grass, branching culms that root at the nodesBunch-type grass, branching culms that root at the nodes

7 Leaves Leave are linearLeave are linear 8 to 12 inches long8 to 12 inches long Grow from erect clumpsGrow from erect clumps

8 Panicle Flowers are pink-purple, borne in panicles 4 to 8 inches longFlowers are pink-purple, borne in panicles 4 to 8 inches long Covered with reddish hairs, turning gray/silver with ageCovered with reddish hairs, turning gray/silver with age Seeds extremely viable, wind-dispersed – major mechanism of spreadSeeds extremely viable, wind-dispersed – major mechanism of spread

9 Management PreventativeCulturalMechanicalBiologicalChemical

10 Preventative 1.Remove existing plants, before seeds are produced 2.Prevent movement of plant material, such as seed contaminated fill dirt, into areas not infested with natalgrass 3.Rouge out plants in abandoned areas

11 Cultural 1.Programs to educate farmers, ranchers and the general public about the problems associated with natalgrass and proper identification 2.Dense groundcover, native or pasture, will deter the growth of natalgrass seedlings

12 Biological 1.There are no known biological control agents available for natalgrass management in Florida or the southeastern U.S.

13 Mechanical 1.Can be removed with repeated, aggressive tillage  Limited to open (non-forested) sites  Disk several times during season – need to repeat for emerging seedlings from soil seedbank  Desiccates plants & exhaust food reserves 2.Burning effective in removing above ground biomass, may enhance chemical control measures – but will not provide control!!

14 Chemical 1.Broadcast applications for large areas Glyphosate at 2 to 4 lbs-ai/A Glyphosate at 2 to 4 lbs-ai/A Imazapyr at 0.5 to 1.0 lbs-ai/A Imazapyr at 0.5 to 1.0 lbs-ai/A 2.Spot treatment for smaller areas Glyphosate – 2 to 3% solution Glyphosate – 2 to 3% solution Imazapyr – 0.5 to 1% solution Imazapyr – 0.5 to 1% solution 3.Use surfactant at 0.25% 4.Adhere to planting restrictions for imazapyr, may cause residual damage

15 Integrated 1.For best results combine:  Burning  Tillage (mechanical disturbance)  Chemical applications 2.Burn or mow before herbicide application  Remove excess thatch and older leaves  Initiates regrowth

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17 Useful Links Floridata Homepage: http://www.floridata.com/main_fr.cfm?state =Welcome&viewsrc=welcome.htm http://www.floridata.com/main_fr.cfm?state =Welcome&viewsrc=welcome.htm University of Florida Center for Aquatic and Invasive Plants: http://aquat1.ifas.ufl.edu/welcome.html http://aquat1.ifas.ufl.edu/welcome.html University of Florida’s Cooperative Extension Electronic Data Information Source: http://edis.ifas.ufl.edu/index.htmlhttp://edis.ifas.ufl.edu/index.html

18 Useful Links Pacific Island Ecosystems at Risk (PIER). Plant Threats to Pacific Ecosystems: http://www.hear.org/pier/threats.htm http://www.hear.org/pier/threats.htm

19 Literature Cited Langeland, K.A. and K. Craddock Burks. 1998. Identification and Biology of Non- Native Plants in Florida's Natural Areas. IFAS Publication SP 257. University of Florida, Gainesville. 165 pp