A relatively new patch of cogongrass recently found in Washington County. Photo Credit: Mark Mauldin
Define Invasive Species: must have all of the following –
Is non-native to the area, in our case northwest Florida
Introduced by humans, whether intentional or accidental
Causing either an environmental or economic problem, possibly both
Define “Dirty Dozen” Species:
These are species that are well established within the CISMA and are considered, by members of the CISMA, to be one of the top 12 worst problems in our area.
Native Range:
Cogongrass is from southeast Asia.
Introduction:
It was accidentally introduced as an “escapee” from satsuma crates brought to Grand Bay, Alabama in 1912. It was later intentionally introduced into Mississippi in the 1920s as a forage crop and then to Florida in the 1930s for both forage and soil stabilization.
EDDMapS currently list 79,134 records of this plant. All are listed in the southeastern U.S. Most are in Florida and Alabama, but there are records from Mississippi, Louisiana, Texas, Georgia, North and South Carolina.
Within our CISMA there are 13,279 records. This is probably underreported.
Description:
Cogongrass is a perennial grass that can vary in color from a bright-light green when young to a brown-orange when older. It does die back in areas with cold winters and heavy frost and becomes brown. The leaves emerge from the ground in clumps and can reach four feet in height. The blades are 0.5-0.75 inches wide and the light-colored midline is off center. The blades are serrated along the edge. In the spring the grass produces large white colored fluffs of seeds extending above the leaves to be carried by the wind. There are numerous small seeds joined on long hairs of these structures. There is an extensive rhizome system beneath the ground that can contribute to short distance spread.
Issues and Impacts:
The plant spreads aggressively and has been found in ditches, along roadsides, in pastures, timberlands, golf courses, empty lots, and even on barrier islands. It spreads both by seed wind dispersal and rhizome fragmentation. The plant is known to be allelopathic, desiccating neighboring plants and moving in. It can form dense monocultures in many areas.
The serrated edges of the leaves make it undesirable as a livestock forage, a fact not detected until the plant was established. It can cover large areas of pasture making it unusable. In the winter the plant becomes brown and can burn very hot. Timberland that has been infested with cogongrass can burn too hot during prescribed burns actually killing the trees.
It is currently listed as one of the most invasive plants in the United States. It is a federal and state noxious weed, it is prohibited all across Florida and has a high invasion risk.
Management:
The key to controlling this plant is destroying the extensive rhizome system. Simple disking has been shown to be effective if you dig during the dry season, when the rhizomes can dry out, and if you disk deep enough to get all of the rhizomes. Though the rhizomes can be found as deep as four feet, most are within six inches and at least a six-inch disking is recommended.
Chemical treatments have had some success. Prometon (Pramitol), tebuthurion (Spike), and imazapyr have all had some success along roadsides and in ditches. However, the strength of these chemicals will impede new growth, or plantings of new plants, for up to six months. This can lead to erosion issues that are undesirable. Glyphosate has been somewhat successful, and its short soil life will allow the planting of new plants immediately. Due to this however, it may take multiple treatments over multiple years to keep cogongrass under control and it will kill other plants if sprayed during treatment.
Most recommend a mixture of burning, disking, and chemical treatment. Disking and burning should be conducted in the summer to remove thatch and all older and dead cogongrass. As new shoots emerge in late summer and early fall herbicides can then be used to kill the young plants. Studies and practice have found complete eradication is difficult. It is also recommended not to attempt any management while in seed (in spring). Tractors, mowers, etc. can collect the seeds and, when the mowers are moved to new locations, spread the problem. If all mowing/disking equipment can be cleaned after treatment – this is highly recommended.
For more information on this Dirty Dozen species, contact your local extension office.
References
Cogongrass, University of Florida IFAS Center for Aquatic and Invasive Plants
Cogongrass seedheads are easily spotted this time of year. Photo Credit: Mark Mauldin
We are well into spring and a wide variety of plants are showing off their colorful blooms. As lovely as most of the blooms are, some springtime colors are an unwelcome sight. Such is the case with the showy, white seedhead that is produced by Cogongrass (Imperata cylindrica). The presence of Cogongrass – a highly aggressive, invasive, perennial – in Florida is not news; it has been in Florida since at least the 1930’s. However, the white seedhead that it produces in the spring makes it easier to locate and identify. When the seedhead is not present, the somewhat boring looking grass has the ability to blend in with its surroundings. This makes it harder for un-expecting landowners to identify the new/small infestations which are much easier to eliminate than are larger, well established infestations.
While cogongrass spreads primarily by rhizomes the seedheads can make new infestations easier to find. Photo Credit: Mark Mauldin
Controlling cogongrass is not easy but it is necessary. If left uncontrolled cogongrass will continue to aggressively spread, displacing other desirable vegetation. Generally speaking, control is a multi-year process. Because the specific recommendations for controlling cogongrass can vary somewhat by situation it is highly advisable that you contact a UF/IFAS Extension Agent in your county if you suspect that you have cogongrass on your property.
“Cogongrass is a perennial that varies greatly in appearance. The leaves appear light green, with older leaves becoming orange-brown in color. In areas with killing frosts, the leaves will turn light brown during winter months and present a substantial fire hazard. Cogongrass grows in loose to compact bunches, each ‘bunch’ containing several leaves arising from a central area along a rhizome. The leaves originate directly from ground level and range from one to four feet in length. Each leaf is 1/2 to 3/4 of an inch wide with a prominent, off-center, white mid-rib. The leaf margins are finely serrated; contributing to the undesirable forage qualities of this grass. Seed production predominately occurs in the spring, with long, fluffy-white seedheads. Mowing, burning or fertilization can also induce sporadic seedhead formation. Seeds are extremely small and attached to a plume of long hairs.”
This is the time of year when cogongrass is the easiest to identify. Take advantage of this opportunity to locate new infestations and work with your county agent to develop a control plan. Once a plan is in place, follow it to the end. Stopping after the first year will practically ensure that control will not be achieved.
A relatively new patch of cogongrass recently found in Washington County. Photo Credit: Mark Mauldin
More information on cogongrass can be found by following the links below
Cogongrass Photo Credit: Chris Evans, Illionois Wildlife Action Plan, www.bugwood.org
Cogongrass is one of the 10 worst weeds in the world. This grass is an aggressive grower and forms colonies causing loss of productive forest areas, severe degradation of habitat, and economic issues. Since its introduction in the 1900s, Cogongrass has spread to most of the counties in Florida. Reproduction occurs through seed production and the creeping rhizome system. This plant is prolific once established with the creation of a very dense rhizome system that retains water and releasing of allelopathic chemicals reducing competition from other plants.
Cogongrass is yellow/green in color with an off-set midrib and a fluffy white seed head. Cogongrass is drought and shade tolerant. Once this grass invades, it will quickly displace the native species and requires frequent and intensive controls.
Early detection is best since a small infestation is easier and cheaper to treat. The larger infestations become more time intensive, expensive, and difficult. There are treatment options for these infestations, make sure that specific instructions are followed and treatment is repeated.
For more information on the biology of this plant and various treatment options visit http://edis.ifas.ufl.edu/wg202. Also, by contacting your local UF/IFAS Extension office for assistance and information.
Cogongrass is a fire-adapted species, thriving where fire is a regular occurrence. In fact, the threat of wildfires greatly increases with the presence of cogongrass, a non-native invasive species. Cogongrass fires burn hotter and faster than native grass fires. This footage, shot in Baldwin County, Alabama, demonstrates how destructive a cogongrass fire can be to native vegetation.
Tawny Crazy Ant (Nylanderia fulva):
Cleaning up large piles of dead ants are a daily cleanup chore for this homeowner. Photo: Dan Culbert, UF/IFAS Extension Okeechobee County
Nylanderia fulva is part of the group of ants called “crazy ants” due to their erratic and quick movements. These ants are medium to small and goldish brown to reddish brown in color. The Tawny Crazy Ants nest in large numbers in leaf litter, soil, rotten logs, under potted plants and along underground electrical conduits.
Nylanderia fulva is a nuisance to humans. They infest gardens, sidewalks and other areas of human traffic. They cause damage to electrical lines. They also displace other native ant species due to their large colony size.
This ant, Nylanderia fulva, has been confused with several other ants such as the Nylanderia pubens and Nylanderia guatemalensis.
Controlling the bug population in your garden and around your home will help decrease the likelihood of Tawny Crazy Ants invading. Avoid transporting plant material, mulches and such to uninfested areas. Granular baits can be used to control smaller populations but large populations will probably need a professional pest control service.
The Tawny Crazy Ant was a Featured Creature by UF/IFAS Entomology and Nematology. Also, the UF/IFAS School IPM has some good information about controlling Tawny Crazy Ant.
March 2nd: Cogongrass (Imperata cylindrica) & Napier Grass (Pennisetum purpureum):
Photo by Jennifer Bearden
Cogongrass: Cogongrass is one of the 10 worst weeds in the world. This grass is an aggressive grower and forms colonies causing loss of productive forest areas, severe degradation of habitat, and economic issues. Since its introduction in the 1900s, Cogongrass has spread to most of the counties in Florida. Reproduction occurs through seed production and the creeping rhizome system. This plant is prolific once established with the creation of a very dense rhizome system that retains water and releasing of allelopathic chemicals reducing competition from other plants. The main identifying characteristic is the off-center mid rib and its yellow green coloring.
Once this grass invades, it will quickly displace the native species and requires frequent and intensive controls. Early detection is best since a small infestation is easier and cheaper to treat. The larger infestations become more time intensive, expensive, and difficult. There are treatment options for these infestations, make sure that specific instructions are followed and treatment is repeated. For more information on the biology of this plant and chemical control updates visit http://edis.ifas.ufl.edu/wg202 or http://plants.ifas.ufl.edu/node/199. Also, by contacting your local UF/IFAS Extension office for assistance and information.
For more information contact the author Brooke Saari, Sea Grant Marine Science Extension Agent, 850-689-5850
Napier Grass photo courtesy of UF/IFAS Center for Aquatic and Invasive Plants. http://plants.ifas.ufl.edu
Napier grass (Pennisetum purpureum),): Also called elephant grass, is an invasive, cane-like grass. It grows in a wide range of soils and in many different habitats. It can grow in wetlands but is also very drought tolerant. Napier grass hinders flood control and water flow by growing densely in ditches and canals. Napier grass grows in dense clumps up to 15 feet tall. The growth pattern resembles bamboo however it produces long leaves and curves down giving it a j-shaped appearance. It can reproduce via root crown divisions or rhizome and stem fragments. It doesn’t consistently produce viable seed.
It was introduced in the U.S. in 1913 as a forage crop and in Florida in 1915 as an ornamental. Commonly found naturalized in central and south Florida, it has been infrequently documented in Northwest Florida. This is possibly due to low cold tolerance in the plant. A frost will kill the plant above ground while frozen soils are needed to kill the rhizomes. Cultivation can actually allow Napier grass to spread. It can be controlled chemically by using a 2% glyphosate solution with a surfactant and ammonium sulfate.
Napier grass is currently a category I weed on the Florida Exotic Pest Plant Council Invasive Plant List. Category I weeds alter native plant communities by displacing native species, changing community structures or ecological functions, or hybridizing with natives.Visit http://edis.ifas.ufl.edu/sc071 for background and control information.
For more information contact the author Jennifer Bearden, Agriculture Extension Agent, 850-689-5850.
Join us for a workshop on the biology and control of cogongrass.
January 14, 2014
Registration begins at 8:30am (Eastern Time)
Program starts at 9:00am (Eastern Time) and will end at 4:30pm (Eastern Time).
The cost of the workshop is $25 and includes lunch.
Locations:
Pensacola, Fl
Crestview, Fl
Chipley, Fl
Tallahassee, Fl
Please remember to specify which locations when calling to register and purchase the correct location ticket when registering online.
Pesticide CEUs have been requested. We are awaiting final approval and will update this post as soon as we have additional information. If you have questions please contact us at 850-606-5200.
AGENDA
Cogongrass in the Panhandle Workshop
9:00 – 9:50 AM – Overview, Biology and Control of Cogongrass – Dr Greg MacDonald, UF-IFAS Agronomy – Participants will learn what we currently know about the biology and control of cogongrass.
9:50 – 10:40 AM – “Safely Applying Right of Way Herbicides” – Jennifer Bearden & Sheila Dunning, UF-IFAS Extension Okaloosa County – Participants will learn pathways of herbicide efficacy, safety, label-reading, and PPE for common Right of Way Herbicides.
11:00-11:50 AM – Update: “Cogongrass Control in ROW, Forestry and Natural Areas – New Research, New Programs” – Participants will learn herbicide selections, application rates, timing and methods of control being researched and employed in the Southeast.
11:00 – 11:25 AM – “Imazapyr and Glyphosate Application Rate, Timing, and Methods for Cogongrass Control” – Dr Pat Minogue, UF-IFAS/NFREC Forestry
11:25 – 11:50 AM – “USFS/Five-State Forestry Agency Cogongrass Initiative” – Dr Jeff Eickwort, FDACS-Florida Forest Service
11:50 AM – 12:40 PM – “Cooperative Invasive Species Management in the Panhandle”
11:50 – 12:10 – “Breaking down Artificial Barriers to Allow Everyone to Cooperate” –
Brian Pelc, Natural Areas Restoration Specialist with The Nature Conservancy, and Invasive Species Coordinator for the Apalachicola National Forest, USFS
12:10 – 12:25 – A Regional Case Study from the Apalachicola CISMA (Cooperative Invasive Species Management Area) – Brian Pelc, Natural Areas Restoration Specialist with The Nature Conservancy and Invasive Species Coordinator for the Apalachicola National Forest, USFS
12:25 – 12:40 – A Regional Case Study from the Six Rivers CISMA – Brooke Saari, Sea Grant Extension Agent, UF/IFAS Extension in Okaloosa and Walton counties
12:40 – 1:30 PM – Lunch (catered-in at each host site)
1:30 – 2:30 PM – “Tools for Identifying, Tracking and Managing Cogongrass across the Landscape” – Participants will learn to use technologies available to identify, track and manage cogongrass infestations.
1:30 – 2:00 PM – “Monitoring Cogongrass Infestations with EDDMapS” – Jed Dillard, UFIFAS Extension Jefferson County
2:00 – 2:30 PM – “A Local Case Study from the City of Tallahassee”– Tony Murray, Coordinator of Environmental Regulation Compliance with City of Tallahassee Environmental Policy and Energy Resources/ Policy & Program Development
The following topics will be covered by Extension faculty at each site.
Okaloosa – Jennifer Bearden and Sheila Dunning
Washington – Mark Mauldin and Josh Thompson
Leon – Will Sheftall and Stan Rosenthal
Jefferson – Jed Dillard
2:30 – 2:55 PM – Cogongrass and Look-alikes ID – Participants will learn how to identify Cogongrass and some similar plants.
3:00 – 3:25 PM – Label Reading Exercise – Participants will learn to read herbicide labels and why it is important.
3:30 – 3:55 PM – Sprayer Calibration – Participants will learn methods to calibrate ATV and Backpack sprayer equipment.
4:00 – 4:25 PM – Personal Protective Equipment – Participants will learn proper equipment and why it is important.
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