National Invasive Species Awareness Week: March 3rd – March 8th
March 6th: Chinese Privet (Ligustrum sinense) & Alligator Weed (Alternanthera philoxeroides):
Video courtesy of Aquatic and Invasive Plant Identification Series by the UF/IFAS Center for Aquatic and Invasive Plants (http://plants.ifas.ufl.edu) and the Florida Fish and Wildlife Commission, Invasive Plant Management Section.
Chinese Privet: Chinese Privet is a non-native shrubby tree commonly found in forested areas in northern Florida. This eastern invader thrives in low-lying, wet areas near forest openings and fence rows. Other species of the Ligustrum genus are commonly grown in landscapes. Chinese Privet can be identified in the spring by its small white flowers which omit a foul odor. Birds easily spread this weed by feeding on and excreting the fruit which contain many seeds. Additionally, Chinese Privet can spread by underground plant structures called rhizomes which allow new shoots to sprout up from the ground from a mother plant. For control options of Chinese Privet, see http://www.gainvasives.org/pubs/gfcnew.pdf or contact your local extension agent.
For more information, contact the author Josh Thompson, Regional Agriculture/IPM Extension Agent 850-482-9620.
Alligator Weed:This highly invasive aquatic weed, which is a native of South America, was first discovered in Florida in 1894 and is believed to have been transmitted through ballast water. Alligator Weed is usually found as sprawling mats
Alligator Weed photo by Vic Ramey courtesy of UF/IFAS Center for Aquatic and Invasive Plants, University of Florida
across the surface of water. Although classified aquatic, it can be found along shorelines or dry land.
This plant is a category II invasive and also an aquatic weed. “This species is on the FL DACS Prohibited Aquatic Plant List – 5B-64.011. According to Florida Statute 369.25, No person shall import, transport, cultivate, collect, sell, or possess any noxious aquatic plant listed on the prohibited aquatic plant list established by the department without a permit issued by the Florida Department of Environmental Protection. See 5B-64.011 for more information.”
There are several biological controls of Alligator Weed, such as the Alligator weed Flea Beetle. For more information about this biological control and others, please see the following IFAS extension publication. https://edis.ifas.ufl.edu/in831 .
For more information, contact the author Matt Orwat, Horticulture Extension Agent 850-638-6180.
National Invasive Species Awareness Week: March 3rd – March 8th
March 5th: Wild Hogs (Sus scrofa) & Water Hyacinth (Eichhornia crassipes):
Wild boar Photo Credit: Florida Fish & Wildlife Conservation Commission
Wild Hogs: Wild Hogs, also called Feral Hogs, are not native to the United States. Wild hogs are highly adaptable and can find suitable habitat easily. They are very prolific. Females have multiple litters of 3-8 piglets per year. Wild hogs are opportunistic omnivores that feed by rooting and grazing. The impact of wild hogs on the environment is soil erosion, decreased water quality, spread of other invasive plants, damage to agricultural crops, and damage to native plants and animals. Wild hogs pose a health risk to humans because they can carry numerous diseases and parasites. Human hunting is the most significant cause of mortality in wild hogs, although hunting alone will not eradicate hogs from a given habitat. The most effective way to remove wild hogs from a location is a combination of trapping and shooting. For more information on Wild Hogs, go to: http://edis.ifas.ufl.edu/uw322
For more information contact the author Jennifer Bearden, Agriculture Extension Agent, 850-689-5850.
Water Hyacinth:The water hyacinth is a floating non-native plant, which if left unchecked and allowed to grow to its maximum potential,
Water Hyacinth Photo Credit: Vic Ramey, UF
can weigh up to 200 tons per acre of water. Once it gets into rivers, it can choke out other vegetation and make navigation difficult if not impossible, because the plants will grow intertwined and form huge floating mats that can root on muddy surfaces. Water hyacinth is a wolf in sheep’s clothing—it is a highly ornamental plant. The plant will be several inches tall with showy lavender flowers and rounded, shiny, smooth leaves. These leaves are attached to spongy stalks that help keep the plants afloat. The prolific roots are dark and feathery. Although here in northwest Florida most of it dies back in the winter, it is able to regrow when the weather and water warm up. This weed can be controlled by physical removal, through biological control options—water hyacinth weevils will be useful in keeping the plant populations down—and by chemical means. For more information on hyacinth and other weed control in Florida ponds, please see the UF IFAS publication Weed Control in Florida Ponds. If you have any questions about identifying a pond weed, contact your friendly local county Extension agent.
For more information contact the author Libbie Johnson Agriculture Extension Agent, 850-475-5230.
National Invasive Species Awareness Week: March 3rd – March 8th
March 4th: Cogongrass (Imperata cylindrica) & Hydrilla (Hydrilla verticillata):
Cogongrass Photo Credit: Chris Evans, Illionois Wildlife Action Plan, www.bugwood.org
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 various treatment options visit http://edis.ifas.ufl.edu/wg202. 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
Hydrilla:Hydrilla is a submerged plant that grows in dense mats up to the surface of freshwater habitats, including ponds, lakes, springs, and rivers. Growing at the rapid rate of an inch a day and up to 25 feet long, hydrilla shades out beneficial native plants and clogs waterways, preventing flood control, boating, shrimping and fishing. In dense populations, the plant can alter oxygen levels and water chemistry and survive in a wide variety of nutrient conditions, sunlight availability, and temperatures.
Hydrilla Photo Credit: Vic Ramey, UF
Originally found in Asia and introduced to Florida (likely through Tampa and Miami) in the 1950’s as part of the aquarium trade, hydrilla has become a very expensive problem for the state. Millions are spent annually on chemical and mechanical treatment simply to maintain the plant. Adding to the problem is the fact that it is still available commercially, even though it has been placed on the US Federal Noxious Weed List.
Methods of control include mechanical harvesters and chopping machines (although fragments of hydrilla left in the water can regrow), introduced insects and fish (particularly the Chinese grass carp), aquatic herbicides, and lake drawdowns. Hydrilla is often transported from one body of water to the other by unknowing boaters moving fragments of the plant left on boats, trailers, or live wells, so learning to identify the plant and cleaning boats before leaving the ramp are helpful in prevention. Visit the Extension Hydrilla IPM site for more helpful tips at: http://entomology.ifas.ufl.edu/hydrilla/index.shtml.
For more information contact the author Carrie Stevenson, Coastal Sustainability & Natural Resources Agent, 850-475-5230.
National Invasive Species Awareness Week: March 3rd – March 8th
March 3rd: Tropical Soda Apple (Solanum viarum) & Lionfish (Pterois volitans):
Tropical Soda Apple Photo Credit: Jeffrey Mullahey, UF, Bugwood.org
Tropical Soda Apple: Florida ranchers know Tropical Soda Apple (TSA) as the “Plant from Hell.” It was first noticed in south Florida, but its seeds survive in the digestive tracts of animals and it spread north through the movement of hay and cattle. TSA plants are covered with thorns and can make large sections of pasture nearly useless for livestock. Concerted efforts to lessen the population of TSA since its arrival have reduced the populations in pastures but it persists in sheltered or waste locations. Cattle, birds, deer and feral hogs ingest the mature fruits and spread the plants to loafing and browsing areas that may be inaccessible to mechanical treatment with anything larger than a hoe. According to Dr. Jeff Mullahey, who has been working on TSA since its appearance in south Florida, one plant can produce 40,000-50,000 seeds with seed germination ranging from 75%-100%. The seeds remain viable for at least three years. Be on the lookout for these while engaged in outdoor activities.
Isolated plants can be controlled by mechanical means. You won’t want to pull them up barehanded, though. Additional information and control methods are available at http://edis.ifas.ufl.edu/uw097, or contact your local Extension agent.
For more information contact the author Jed Dillard, Livestock & Forages Extension Agent by phone at 850-342-0187.
Lionfish:The Red Lionfish is a non-native invasive predatory reef fish that has spread throughout Florida waters. Lionfish are members of the family Scorpaenidae; all members are venomous and the lionfish is no exception. This fish is relatively small, typically ranging from 12-15 inches in length with a zebra-like appearance and long, showy pectoral fins. They have a row of long, dorsal spines that contain venom glands. Their native range is the South Pacific and Indian Oceans and preferred habitat is on offshore reef structures. These fish are considered to be voracious eaters feeding on native fish, reducing vital native populations, and competing for food with native fish such as grouper and snapper.
Lionfish, Photo Credit: Rebekah D. Wallace, UGA, Bugwood.org
With few predators, these fish are thriving in Florida waters, even in the northern Gulf of Mexico. They reproduce often, sometimes all year, with their eggs hatching after about two days. They also consume a variety of local species, causing 80% decline in reef fish recruitment and loss of some economically important species. These fish are able to expand their stomachs for large meals and can survive starvation for over 12 weeks. These fish are an invasive species in our local waters and removal is encouraged. The most effective control of this species is removal by human. These fish are cryptic and nocturnal so locating them can be tricky. Spearfishing is the method of choice, since lionfish rarely bite a hook and line. Florida Fish and Wildlife Commission (FWC) changed regulations to increase harvesting opportunities. Such changes include no requirement for a recreational fishing license when using spearing devices (pole spear, a Hawaiian Sling, handheld net, or spearing devices marked for use on lionfish), and no recreational or commercial bag limit, though recreational fishing license is required for other fishing methods. Check the FWC regulations before fishing or diving for these species.
Lionfish are venomous and must be handled carefully. Venom glands occur on the dorsal, pelvic and anal spines. Lionfish sightings should be reported at 877.786.7267. If stung seek medical attention as soon as possible. Rarely are stings fatal unless the person has an allergy to the venom. The Poison Help Hotline can be reached at 800.222.1222. Sighting information is being collected to track the movement of these species. Fill out the online report on the USGS website or the REEF website. Stay up to date on research as it pertains to this species at www.flseagrant.org.
For more information contact the author Brooke Saari, Sea Grant Marine Science Extension Agent, 850-689-5850
National Invasive Species Awareness Week: March 3rd – March 8th
March 2nd: Chinese Tallow (Sapium sebiferum) & Torpedo Grass (Panicum repens)
Chinese Tallow Photo Credit Cheryl McCormick, UF, www.bugwood.org
Chinese Tallow (Popcorn Tree): Benjamin Franklin has been blamed for introducing the invasive exotic Chinese Tallow tree to the Southeast when he mailed seeds to a planter after one of his trips to London in the late 1700’s. However, recent DNA work has traced the invasive strain to federal scientists’ importations in 1905. No matter. The “Popcorn Tree,” as it’s also called because of its white seeds, has invaded the Gulf of Mexico coast from Texas to Florida, especially the wetlands and bottomland forests. A mature tree may produce as many as 100,000 seeds annually. These seeds can be spread by birds or moving water and expedite the trees’ takeover of habitat. The sap and berries are toxic to humans and livestock. It has been planted for its red fall color, but it crowds out native wetland species such as black gum and red maple, both noted for their red fall leaves. Its tolerance to flooding and saltwater can also make it a threat to bald cypress.
Recently research by scientists of the US Forest Service and others has shown that dissolved oxygen and pH levels in the leaf litter of the tallow tree are fatal to the early stage eggs of the leopard frog. While tallow trees provide a nectar source for bees and have been investigated as a biofuel source, the damage to wetlands caused by these invaders more than offsets the positive aspects of the plant.
To control this species, small seedlings may be hand pulled, especially in wet areas, but care should be taken to leave no root pieces to resprout. Herbicides including triclopyr can control Chinese Tallow. More information is available at http://edis.ifas.ufl.edu/ag148 and http://plants.ifas.ufl.edu/node/676. For local assistance, contact your county UF IFAS Extension office.
For more information contact the author Jed Dillard, Livestock & Forages Extension Agent,850-342-0187.
Torpedo Grass: Torpedo grass (Panicum repens) is an invasive weed that is a scourge in lawns, flowerbeds and landscapes. Even if introduced into a small area, this weed can rapidly spread to become a major problem. Its name is derived from the hard, sharp point of the rhizome that runs horizontally underground, almost like a torpedo going through water. The rhizomes can travel a foot or more deep, and the hard tip will easily punch through landscape fabric and weed barriers.
Torpedo Grass Photo Credit: Graves Lovell, Alabama Department of Conservation & Natural Resources, www.bugwood.org
Native to Africa and Asia, Torpedo Grass was introduced to the United States around 1876, primarily through seed used for forage crops. The real infestation came in the early part of the 20th century when the USDA imported and distributed seed for planting pastures as forage for cattle. Ironically it proved inferior for use as a forage crop. Now it is found in the Gulf South from Florida to Texas and in other coastal areas around the world.
Torpedo grass is nearly impossible to completely eliminate, so management of it is not a matter of how to get rid of it completely but instead how to prevent it from taking over an area. The only way that this can be accomplished is with repeated and frequent efforts. You will have to scout regularly and any time torpedo grass is seen, promptly take action. Prevention is best for management of this weed, mechanical provides moderate control, and the most effective is herbicide use. Glyphosate (Roundup, etc.) has been found to be the most effective control herbicide but specific chemicals and application techniques will vary depending upon the landscape or habitat characteristics. For management in lawns please refer to http://edis.ifas.ufl.edu/ep387 for specific herbicide controls based predominate lawn species. For management of invasive species in natural areas, refer to http://edis.ifas.ufl.edu/wg209 for a comprehensive list of species and their controls. As always, refer to instructions on herbicide label to ensure proper usage. Understand that herbicides will suppress torpedo grass for a time, but they will not kill it. Unfortunately, at this time, there is no quick, easy or permanent way to deal with this weed.
For more information contact the author Rob Trawick, Horticulture Extension Agent,850-482-9620.
