Restrict farming, building construction, and other “high risk” activities to upland sites away from water to prevent damage. Burrowing is a commonly reported damage caused by nutria. Preventive measures should be used whenever possible, especially in areas where damage is prevalent. Unwanted nutria should be destroyed with a shot or blow to the head. Wire tubes can be used to protect baldcypress or other seedlings but are expensive and difficult to use. Carcasses of nutria killed with zinc phosphide should be collected as soon as possible and disposed of by deep burial or burning to prevent exposure of domestic and wild scavengers to undigested stomach material containing zinc phosphide. Sheet metal shields can be used to prevent gnawing damage to wooden and styrofoam structures and trees. Baiting is sometimes used to concentrate nutria in specific locations where they can be controlled more easily. Effective when environmental conditions force nutria into the open. Shooting is most effective when done at night with a spotlight, however, night shooting is illegal in many states and should not be done until proper permits have been obtained. 11 or 2, are preferred by most trappers; however, the No. - Or - use the Midwest Invasive Species Information Network (MISIN) online reporting tool, - Or - download the MISIN smartphone app and report from your phone - http://www.misin.msu.edu/tools/apps/#home. The gulls were certainly taking a toll, but the number of missing eggs was strangely high. Use caution when handling live muskrats as they will bite and scratch with their clawed feet. On poorly drained soils, contour small ditches to eliminate low spots and sills and enhance rapid drainage.
0000074256 00000 n Plant baldcypress seedlings in the fall to minimize losses. 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. 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. “It was a shocker.” Her research is the first to reveal that nutria steal and eat bird eggs. Continued deep plowing of land undermined by nutria can destroy shallow burrow systems and discourage new burrowing activity. Protect small areas with partially buried fences. As a general rule, barriers are too expensive to be used to control damage to agricultural crops. 0000071518 00000 n Cessation of damage is the best indicator that zinc phosphide is controlling problem animals. Post-Control Procedures. A large raft can hold up to 8 traps.
Use drowning sets when deep water is available. Leghold traps should be used with care to prevent injury to children and pets. Conversely, efforts to protect rice field levees or the shorelines of southern lakes and ponds should be initiated during the winter when animals are mobile and concentrated in major ditches and other large bodies of water. Many nutria die in dens, dense vegetation, and other inaccessible areas. Any drainage that holds water can be used by nutria as a travel route or home site. Nutria breed fast, and all those mouths to feed can quickly chew through much of the vegetation on an isolated island. Nontarget animals should be released. 220-2, is the most commonly used body-gripping trap for controlling nutria. Nutria girdle fruit, nut, deciduous and coniferous forest trees, and ornamental shrubs. 160-2 and 330-2 Conibear® traps can also be used. Past studies have shown that zinc phosphide can kill over 95% of the nutria present along waterways when applied to fresh baits at a 0.75% (7,500 ppm) rate. Rodents are known for being pests, but the nutria may be the worst of them. 0000007415 00000 n They’re big, buck-toothed and chew up Calif. wetlands. 5). In these cases, safe and effective methods must be tailored to specific problems. 0000003304 00000 n Nutria don't just destroy wetlands, they're also raiding bird nests, scientists say, Tristan Baurick, NOLA.com | The Times-Picayune. The success of this type of control is usually short-lived and problem animals soon return.
Traps can be lightly covered with leaves or other debris to hide them, but nutria are easily captured in unconcealed traps. Brush piles left on the ground or in low spots can become ideal summer homes for nutria. Baiting in these areas increases efficiency and reduces the likelihood that nontarget animals will be affected. Nutria breed fast, and all those mouths to feed can quickly chew through much of the vegetation on an isolated island. Nutria become wary quickly, so limit shooting to no more than 3 nights, followed by 2 to 3 weeks of no activity. chewing. The amount of untreated bait eaten the last night of prebaiting determines how much treated bait should be used on the first night.
Feeding sites should be lit continuously by a spotlight and easily visible to the shooter from a vehicle or other stationary blind. “Then it takes an egg and runs off.”. Bait can be used to lure nutria to leghold sets. Bait boards should be spaced 50 to 100 feet (15.2 to 30.5 m) apart in areas where nutria are active. Care should be taken when shooting over open water to prevent bullets from ricocheting. Zinc phospide is the only toxicant that is registered for controlling nutria. Nutria are aggressive competitors with the native muskrat which is smaller. Ground baiting is justified and effective when eliminating the last few nutria in a local population. Limbs with the bark removed, or dams and lodges constructed of limbs and mud also indicate the presence of beaver. Water level manipulation is expensive to implement and has not yet been proven to be effective. After the main concentrations of nutria are removed, control efforts should be directed at removing wary individuals.
Nevertheless, this method should be considered when a comprehensive nutria control program is being developed. “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.
3 double longspring, or the soft-catch fox trap can also be used effectively. Protect baldcypress and other seedlings with hardware cloth tubes around individual plants or wire mesh fencing around the perimeter of a stand. Rapid immigration coupled with a high reproductive rate makes population control a "high effort" method of damage control and often ineffective. In Oregon, nutria are classified as unprotected Nongame Wildlife (OAR 635-044-0132).
50 0 obj<>stream Boat Shooting. Use is usually restricted to industrial or commercial applications. Unwary nutria can be captured using a long-handled dip net.
Now it appears they’re also causing trouble for terns, skimmers and other shorebirds that rely heavily on Louisiana’s coastline for breeding and nesting. Prepare zinc phosphide baits as needed to prevent deterioration. In small ditches or areas where nutria densities are low, use 6-inch (15.2-cm) square floating bait boards made of wood and styrofoam, in lieu of rafts (Fig.
Nutria girdle fruit, nut, deciduous and coniferous forest trees, and ornamental shrubs. Prebaiting should continue at least 2 successive nights after nutria begin feeding at a baiting site. 0000000816 00000 n Mama Nutria has mammary glands on her sides so the … Timing and location of control activities are important factors governing the success or failure of any control project. Make trail sets by placing a trap offset from the trail’s center line so that nutria are caught by the foot. Welded-wire cylinders around individual plants are often used where only a few plants need to be protected. 11 and 2, as preferred by trappers and wildlife damage control specialists. Nutria are easily captured in single- or double-door live traps that measure 9 x 9 x 32 inches (22.8 x 22.8 x 81.3 cm) or larger. 0000010084 00000 n Nutria can be shot by slowly stalking along the banks of ditches and levees; this can be an effective control method where nutria have not been previously harassed. Other Cultural Methods.
They dig up lawns when feeding on the tender roots and shoots of sod grasses.
Nutria can be shot by slowly stalking along the banks of ditches and levees; this can be an effective control method where nutria have not been previously harassed.
Observations of prebaited sites will help you decide how the control program should proceed.
Vegetation Control.
Shooting from dusk to about 10:00 p.m. for 3 consecutive nights is effective once a regular feeding pattern has been established.
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