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Montana's Top Invasives Species to Watch

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This beetle threatens ash trees in Montana’s urban communities, shelterbelts, and woody draws. The larvae feed on tissue underneath the bark, killing the tree. Emerald ash borer is one of many tree-killing beetles that can travel long distances in firewood. Preventing the transport of firewood from out of state into Montana can slow the spread of this and other tree pests. Emerald ash borer has infested 35 eastern states but was recently discovered in Oregon.

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Call 406-444-2976 if you see a feral pig!
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Invasive aquatic plants degrade aquatic habitats, impede water-based recreation and obstruct irrigation canals. Flowering rush has infested Flathead Lake and downstream to the Clark Fork River. Preventing the spread of invasive aquatic plants through cleaning watercraft and preventing aquarium and ornamental pond releases is an important part of protecting Montana’s waters

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Invasive mussels can have major impacts on Montana’s waters. They disrupt the food chain and impact recreational boating and fishing. Mussels can cause significant damage to infrastructure by clogging pipes used for hydropower, irrigation, and water treatment plants. Zebra mussels are established in the Dakotas and other eastern states. Preventing the spread of invasive mussels by cleaning watercraft and equipment is a top regional priority.

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A noxious winter annual grass which can impact Montana’s native landscapes and degrade rangelands, pastures, and crops by decreasing agricultural production and increasing the risk of soil erosion. Ventenata has little to no forage value and its diminutive stature makes it difficult to identify. Ventenata is found from northwestern through southcentral and southeastern Montana.

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