This highly invasive pest permanently alters plant and animal communities, increases fire frequency and intensity, and requires extensive investment to control. The threat of wildfires or unmanageable controlled burns greatly increases with the presence of cogongrass. In later stages of invasion, circular infestations can merge and linear infestations can form along highways, fences, and around water bodies. This plant is not native to North America, but has naturalized in much of the United States. Imazapyr is effective at low-volume rates and does not contain heavy metals, organochlorides or phosphates, making it safe to humans and livestock. (Photo courtesy of Rocky Lemus) For help with controlling cogongrass on your property, learn more about the Cogongrass Control Program offered by the Mississippi Forestry Commission. Habitat requires the use of a spray adjutant when applying on post-emergent vegetation. State forestry officials are warning of an invasive weed that chokes out native plants. Roundup Ultra, Roundup Pro, or other brands of glyphosate (41% active ingredient formulations) at 5 quarts per acre or as a 1.5% solution will suppress cogongrass. Oxygen depletion can kill fish in the pond. Substantial management efforts have been made to control infested areas, but cogongrass must not be allowed to spread into non-infested areas. In open fields and forests cogongrass initially forms circular infestations that appear light green in summer and light brown in winter as can be viewed in these oblique aerial photographs. In related news, the Georgia Forestry Commission’s Cogongrass Taskforce recently announced that for the first time since the Forest Service Southern Region’s Forest Health Program began funding cogongrass control in Georgia in 2004, there are more dead cogongrass spots in the state than new areas of cogongrass being reported. Photo Credits: The majority of the aquatic plant line drawings are the copyright of the University of Florida Center for Aquatic Plants (Gainsville). Beware of Cogon Grass. Only glyphosate (Roundup, etc.) Many aquatically registered herbicides have water use restrictions (See General Water Use Restrictions). Brent Sellers and Jason Ferrell, University of Florida, IFAS. A 4% solution of 41% active ingredient material (5 1/3 fluid ounces per gallon of water) sprayed on the green leaves and allowed to dry for 2 to 3 hours will kill the top growth of cogongrass. Habitat of cogon grass. Cogongrass Control in Pastures and Fencerows: Part 2 of a 3 Part Series. If left uncontrolled, thick thistle stands can reduce grazing, result in less forage production, and ultimately, lower calf weaning weight. They are broad spectrum, systemic herbicides. The weed is taking root in Mississippi, and the invasive specieshas also … Habitat is a systemic herbicide that is effective on post-emergent floating and emergent aquatic vegetation. Cogongrass is an aggressive, rhizomatous, perennial grass that is distributed throughout the tropical and subtropical regions of the world. Control Measures All rights reserved (About Us). However, in the long run, you want to make sure that you are getting rid of cogon grass for good. Cogongrass is non-native to the United States. Cogon grass can be tough to kill. and imazapyr (Arsenal, Stalker, etc.) To assist you with these determinations see SRAC #103 Calculating Area and Volume of Ponds and Tanks. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). Common trade or product names include but are not limited to: Liquid glyphosate formulations have been effective on cogongrass above the water line, but ineffective on plants in the water. One danger with any chemical control method is the chance of an oxygen depletion after the treatment caused by the decomposition of the dead plant material. Ag & Natural Resources agent in your county or hire a professional. While it is not illegal to possess this plant in Texas, it should not be introduced into new water bodies and should be treated with herbicide when present. Cogon grass (Imperata cylindrica) is an invasive, non-native grass which occurs in Florida and several other southeastern states.A pest in 73 countries, and considered to be one of the "Top 10 Worst Weeds in the World", cogon grass affects pine productivity and survival, wildlife habitat, recreation, native plants, fire behavior, site management costs and more. 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