Trees girdled by nutria often have no marks from their teeth, as bark may be peeled from the trunk.
Other crops that may be damaged include corn, grain sorghum, beets, alfalfa, wheat, barley, oats, peanuts, melons, and a variety of vegetables from home gardens and farms. Stalks of sugarcane often are gnawed or cut during the growing season, with only the basal internodes of the cut plants that are eaten. Grazing by nutria on rice plants may reduce yields significantly and damage can be locally severe. In the US, sugarcane and rice are the primary crops damaged by nutria. Norway rats clip stems above the surface of the water. Nutria and muskrats damage rice plants by clipping stems at the water line in flooded fields. Damage to Landscapesĭamage caused by nutria, muskrats, and Norway rats often is confused in fields of rice. The feeding and digging of nutria impact sources of food for other species and the integrity of levees and embankments. Nutria present an indirect threat to pets and livestock. Photo by Tess McBride of USDI- Fish and Wildlife Service (USFWS). The action of rain and waves can wash out and enlarge collapsed burrows and compound the damage. Burrows can weaken roadbeds, banks, levees, dams, and dikes, which may collapse when soil is saturated by rain or high water, or when subjected to the weight of vehicles, farm machinery, or livestock on the surface. They burrow under buildings, which may lead to uneven settling or failure of foundations. Nutria sometimes burrow into Styrofoam® floats under boat docks and wharves, causing the structures to lean and sink. In some cases, tunneling in levees is so extensive that water will flow unobstructed, necessitating complete reconstruction of the structure. Burrows of nutria may weaken flood-control levees in low-lying areas. Nutria are notorious for undermining and breaking through water-retaining levees in flooded fields used to produce rice and crawfish. Most damage caused by nutria is due to their burrowing activity. In the US, most damage occurs along the Gulf Coast of Louisiana and Texas and around Chesapeake Bay. Most damage is from feeding or burrowing. Therefore, careful examination of sign left at the site is necessary to identify the species that is responsible. The ranges of nutria, beavers, and muskrats overlap in many areas and damage caused by each may be similar. Identification | Biology | Damage ID | Management | Handlingĭamage by nutria occurs throughout their range.
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