56228-9) allows for a maximum 0.67% (6,700 ppm) treatment rate. Leghold traps are the most commonly used traps for catching nutria. The gulls were certainly taking a toll, but the number of missing eggs was strangely high.

Nutria breed fast, and all those mouths to feed can quickly chew through much of the vegetation on an isolated island. Ryan Wheeler, DNR Invasive Species Biologist, 517-614-1501. This work is supported by New Technologies for Agriculture Extension grant no. Overutilization of emergent marsh plants can damage stands of desirable vegetation used by other wildlife. Leghold traps should be used with care to prevent injury to children and pets.

Zinc Phosphide. This behavior will lead to tree loss. Nutria habitat, in general, is the semiaquatic environment that occurs at the boundary between land and permanent water. Attach baits to small nails driven into the surface of the platform. Other damage done by nutria include tree girdling, structure girdling when the structure is made of wood, sod and other turf destruction when dug up along with small plants being trampled or grazed to the ground.

Manage vegetation to eliminate food and cover. Baiting on the ground should only be used when water sites are unsuitable or lacking. Nutria will readily girdle most any fruit, nut or shade tree. Use sheet metal shields to prevent gnawing on wooden and styrofoam structures and trees near aquatic habitat. 0000003577 00000 n Usually only 25% of the poisoned nutria die where they can be found. 0000003304 00000 n No license is needed for a landowner to control nutria on his/her own property. Body-gripping Traps. 11 or 2, are preferred by most trappers; however, the No. If you have a choice of where to locate your garden, consider nutria damage. Barrier islands are ideal because they rarely have coyotes or raccoons. 0000073965 00000 n Loud noises, high-pressure water sprays, and other types of harassment have been used to scare nutria from lawns and golf courses. The best baiting stations for large waterways are floating rafts spaced 1/4 to 1/2 mile (0.4 to 0.8 km) apart throughout the damaged area. She thought it was an anomaly, but the same thing happened again and again throughout the night.
Water level manipulation is expensive to implement and has not yet been proven to be effective. But eggs were also disappearing at a rapid rate. Dispose of any leftover treated bait in accordance with label directions. It is a grayish-black powder with a heavy garlic-like smell and is widely used for controlling a variety of rodents. Today, the use of zinc phosphide at this concentration is illegal. Nevertheless, this method should be considered when a comprehensive nutria control program is being developed.

Contour stream banks to control burrowing. In some cases, 80% of the nutria in an area can be removed by shooting with a shotgun or small caliber rifle, such as the .22 rimfire. “I could definitely see this being a problem on other isolated islands,” he said. Store unused zinc phosphide in a dry place in its original watertight container because moisture causes it to deteriorate. 0000001166 00000 n Make trail sets by placing a trap offset from the trail’s center line so that nutria are caught by the foot. Damage Identification Muskrat damage includes chew marks or stripped bark on trees, and partially eaten stalks on agricultural crops or wetland vegetation, such as cattails, sedges and water lilies. For example, the label held by USDA-APHIS-Wildlife Services (EPA Reg. chewing.

Since nutria are usually found in waterways, there is often an unlimited supply of replacement animals upstream and downstream from where the damage is occuring. Set traps just under the water where a trail enters a ditch, canal, or other body of water. Nutria are wary creatures and will try to escape when threatened. 3 double longspring, or the soft-catch fox trap can also be used effectively. Install a thin wooden strip around the perimeter of the raft’s surface to keep bait from rolling into the water. Use locking snares to catch nutria when other traps cannot be set. At night, nutria can be located by their red-shining eyes and the V-shaped wake left by swimming animals. The research is only a snapshot of one island over two years. Mix and store baits treated with zinc phosphide only in well-ventilated areas to reduce exposing humans to chemical fumes and dust. Nutria are still damaging 7,000 acres of wetlands in Louisiana. 5).

Most commonly used methods include: In creating dikes and drainage ditches it is often important to consider nutria damage and the maintenance that can be required. Cultural Methods and Habitat Modification, Summary of Damage Prevention and Control Methods, Best Practices for Nuisance Wildlife Control Operators. 0000007415 00000 n The succulent, basal portions of plants are preferred as food, but nutria also eat entire plants or several different parts of a plant. Snares are relatively easy to set, safer than leghold and body-gripping traps, and almost invisible to the casual observer. “That’s insanely high,” she said. Effective when environmental conditions force nutria into the open. Native Range: South America. So she installed several video cameras around tern nesting colonies on Raccoon Island. “It tore a bird off its nest," said Windhoffer, a biologist who was conducting research on Raccoon Island, a barrier island on Louisiana’s coast. Although treated baits can survive light rain, they should not be used when heavy rains are expected, or on open water that is subject to heavy wave action. Observations of prebaited sites will help you decide how the control program should proceed. Zinc phosphide is highly toxic to wildlife and humans, so all precautions and instructions on the product label should be carefully reviewed, understood, and followed precisely. “The population probably rebounded pretty quickly.”. Alternate field and garden sites should be considered in areas where nutria damage has occurred on a regular basis. Protect small areas with partially buried fences. Prebaiting is a crucial step when using zinc phosphide because it leads to nutria feeding at specific sites on specific types of food (such as the baits; carrots or sweet potatoes are preferred).

Unwary nutria can be captured using a long-handled dip net. At high densities and under certain adverse environmental conditions, foraging nutria can … Sheet metal shields can be used to prevent gnawing damage to wooden and styrofoam structures and trees.

This may be extremely difficult or impossible to accomplish in low-lying areas near coastal marshes and permanent bodies of water. 0000006770 00000 n 0000002068 00000 n Care should be taken when shooting over open water to prevent bullets from ricocheting. Other Cultural Methods. Use is usually restricted to industrial or commercial applications. In most cases, successful control will depend on integrating a number of different techniques and methods. Shooting can be used as the primary method of nutria control or to supplement other control techniques. Install bulkheads to deter burrowing into banks. Plant baldcypress seedlings in the fall to minimize losses. Nutria chewing on tree branch. Nutria breed fast, and all those mouths to feed can quickly chew through much of the vegetation on an isolated island.

Do you have a question or comment for ODFW? Boat Shooting. Most cities have restrictions on leg-hold trapping or the discharge of firearms within their city limits--live trapping is usually the main population control measure inside the city limits. Bait live traps with sweet potatoes or carrots and place them along active trails or wherever nutria or their sign are seen. Use caution when handling live muskrats as they will bite and scratch with their clawed feet. Damage to crops, levees, wetlands, and other resources is minimal in areas where nutria are harvested by commercial trappers. Many low-lying areas along the Gulf Coast are protected by flood control levees and pumps that can be used to manipulate water levels. Preventive measures should be used whenever possible, especially in areas where damage is prevalent. 0000001375 00000 n 0000010084 00000 n Baiting in these areas increases efficiency and reduces the likelihood that nontarget animals will be affected. Draining and Grading. The quantity of treated bait eaten each treatment night is the quantity that should be put out the following afternoon. āX �2%~�}LxO�$h8D�9��/;\a��vAA�Γ���.i�z`ɰ��2�ʨ?�;��($:����� � �T^ xref *Not detected in Michigan* There’s little doubt the nutria population grew again last year. When only a few pieces of prebait on a raft are eaten, the raft should be removed and replaced with several scattered baiting boards. 160-2 and 220-2, and locking snares are most effective when set in trails, den entrances, or culverts. Manipulate water levels to stress nutria populations. Live traps should be used when leghold and body-gripping traps cannot be set.

0 At times, animals can be stimulated to vocalize or decoyed to a boat or blind by making a “maw” call, which imitates the nutria’s nocturnal feeding and assembly call. If possible, please take one or more photos of the invasive species you are reporting. Place ground baits near sites of nutria activity, such as trails and entrances to burrows. Avoid placing baits on muskrat houses and beaver lodges. Land that is well-drained and free of dense, weedy vegetation is generally unattractive to nutria. Burn or remove cleared vegetation from the site. Electric wire barriers have also been used to exclude nutria where vegetation can be controlled to keep it from shorting the wires. Also make note of the location, date and time of the observation. %%EOF When cornered or captured, nutria are aggressive and can inflict serious injury to pets and humans. Available control techniques may not be applicable to all damage situations. Shooting can also be done in the late afternoon or early evening from a small boat paddled slowly along waterways and large ditches or along the shores of small lakes and ponds. Nutria are wary creatures and will try to escape when threatened. Nutria become wary quickly, so limit shooting to no more than 3 nights, followed by 2 to 3 weeks of no activity. Email: tbaurick@nola.com • Twitter: @tristanbaurick • Facebook: Tristan Baurick and Louisiana Coastal Watch. Nos. Plastic seedling protectors are not effective in controlling damage to baldcypress seedlings because nutria can chew through them. Crops and gardens located close to water will be more attractive to nutria than those further from water. endstream endobj 49 0 obj<> endobj 51 0 obj<> endobj 52 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB]/ExtGState<>>> endobj 53 0 obj<> endobj 54 0 obj<> endobj 55 0 obj<> endobj 56 0 obj<> endobj 57 0 obj[/ICCBased 64 0 R] endobj 58 0 obj<> endobj 59 0 obj<> endobj 60 0 obj<> endobj 61 0 obj<>stream "They burrow into the sand and eat the vegetation by the roots,” said Aaron Pierce, a wildlife biologist who oversaw Windhoffer’s research. For information on how to live with wildlife, visit these species pages: Bats | Beaver | Birds | Black Bears | Bobcats | Cougars | Coyotes | Deer and Elk | Frogs | Nutria | Osprey | Owls | Raccoons | Snakes | Tree Squirrels | Turkeys | Turtles | Wolves | Young Wildlife.
No chemical repellents for nutria are currently registered. When control is warranted, all available techniques should be considered before a control plan is implemented. That’s when they start cracking into eggs, Windhoffer believes. Where to Bait. That’s when they start cracking into eggs, Windhoffer believes. Eliminate brush, trees, thickets, and weeds from fence lines and turn rows that are adjacent to ditches, drainages, waterways, and other wetlands to discourage nutria.

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