Crooked River Weed Management Area

Central Oregon

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Weed Resources ... Crooked River Weed Management Area

Why Worry About Invasive Species?

Invasive species are non-native species that cause ecological and economic problems by reproducing and growing so prolifically that they displace native species.   It is important to note that not all non-native species are harmful; in fact, some like grapes or wheat are beneficial or harmless.  However, just a few invasive species have the potential to transform entire ecosystems.  Once established, invasive species reproduce and spread, often forming monocultures that slowly take over more and more territory, displace native species and animals, hybridize with those natives, and may potentially alter ecosystem functions and processes.  Often the transition from a native to an invasives-dominated environment is so gradual that it goes unnoticed until it is too late.   Native animals and plants, along with the communities that depend on them for food and shelter begin to disappear.

Crook County Invasive Species Patrol's Most Wanted

1.     African rue

2.     Dyer’s woad

3.     Houndstongue

4.     Jointed Goatgrass

5.     Leafy Spurge (outside of Mill Creek, Ochoco Creek & the Lower Crooked River)

6.     Mediterranean sage

7.     Orange hawkweed

8.     Perennial pepperweed

9.     Scotch & Musk thistle

10.     Dalmatian & Yellow toadflax

11.  Yellow flag iris

12.     Yellow starthistle

13.     Eurasian Watermilfoil

14.     Hydrilla

15.     New Zealand Mudsnail

16.    Zebra & Quagga Mussel

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