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Idaho's Noxious Weeds
Descriptions
Noxious weeds are plant species that are non-native and invasive by nature. Many of these species make significant modifications to the landscape. Idaho currently has 71 listed noxious weeds throughout the state. There are different categories of control for each noxious weed as stipulated in the Idaho Administrative Procedures Act 02, Title 06, chapter 22, Noxious Weed Rules. The categories affect how each weed is managed.
- Statewide Prohibited Genera- All plants, plant parts, and subtaxa of listed genera are prohibited in Idaho
- Statewide Early Detection and Rapid Response (EDRR) - plants in this category must be reported to the Idaho State Department of Agriculture (ISDA) within 10 days after being identified at the University of Idaho or by another qualified authority approved by the ISDA director. Eradication of these weeds must begin in the same season they are found.
- Statewide Control - plants in this list may already exist in some parts of the state. In some areas of the state control or eradication is possible and a plan must be written that will reduce infestations within five years.
- Statewide Containment - plants in this category exist in the state. New or small infestations can be reduced or eliminated, while established populations may be managed as determined by the weed control authority, which is usually the county weed program.
Idaho's 71 Noxious Weeds
Idaho has 71different species of weeds which are designated noxious by state law. The spread of these weeds and the damage they do to Idaho agriculture can be lessened through proper identification and handling. Visit the Idaho Department of Agriculture for more information
Temporary Listing:
Cogon Grass (Imperata Cylidrica), EDRR
Statewide Prohibited Genera
Genus | Image |
---|---|
Chameacytisus: | |
Cytisus: | |
Genista: | |
Spartium: |
Statewide EDRR List
Common Name | Scientific Name |
---|---|
Brazilian Elodea | Egeria densa |
Common/European Frogbit | Hydrcharis morsus-ranae |
Fanwort | Cobomba caroliniana |
Feathered Mosquito Fern | Azolla pinnata |
Giant Hogweed | Heracleum mantegazzianum |
Giant Salvinia | Salvinia molesta |
Goatsrue | Galega officinalis |
Hydrilla | Hydrilla verticillata |
Iberian Starthistle | Centaurea iberica |
Policeman's Helmet | Impatiens glandulifera |
Purple Starthistle | Centaurea calcitrapa L. |
Squarrose Knapweed | Centaurea triumfetti |
Syrian Beancaper | Zygophyllum fabago |
Tall Hawkweed | Hieracium piloselloides |
Variable-Leaf-Milfoil | Myriophyllum heterophyllum |
Water Chestnut | Trapa natans |
Yellow Devil Hawkweed | Hieracium glomeratum |
Yellow Floating Heart | Nymphoides pelata |
Statewide Control List
Common Name | Scientific Name |
---|---|
Black Henbane | Hyoscyamus niger |
Bohemian Knotweed | Polygonum bohemicum |
Buffalobur | Solanum rostratum |
Common Crupina | Crupina vulgaris |
Common Reed (Phragmites) | Phragmites australis |
Dyer's Woad | Isatis Tinctoria |
Eurasian Watermilfoil | Myriophyllum spicatum |
Flowering Rush | Butomus umbelltus |
Giant Knotweed | Polygonum sachalinense |
Japanese Knotweed | Polygonum cuspidatum |
Johnsongrass | Sorghum halepense |
Matgrass | Nardus stricta |
Meadow Knapweed | Centaurea debeauxii |
Mediterranean Sage | Salvia aethiopis |
Musk Thistle | Carduus nutans |
Orange Hawkweed | Hieracium aurantiacum |
Parrotfeather Milfoil | Myriophyllum aquaticum |
Perennial Sowthistle | Sonchus arvensis |
Russian Knapweed | Acroptilon repens |
Scotch Broom | Cytisus scoparius |
Small Bugloss | Anchusa arvensis |
Vipers Bugloss | Echium vulgare |
Yellow Hawkweed | Hieracium caespitosum |
Statewide Containment List
Common Name | Scientific Name |
---|---|
Canada Thistle | Cirsium arvense |
Curlyleaf Pondweed | Potamogeton crispus |
Dalmatian Toadflax | Linaria dalmatica ssp. dalmatica |
Diffuse Knapweed | Centaurea diffusa |
Field Bindweed | Convolvulus arvensis |
Hoary Alyssum | Berteroa incana |
Houndstongue | Cynoglossum officinale |
Jointed Goatgrass | Aegilpos cylindrica |
Leafy Spurge | Euphorbia esula |
Milium | Milium vernale |
Oxeye Daisy | Leucanthemum vulgare |
Perennial Pepperweed | Lepidium latifolium |
Plumeless Thistle | Carduus acanthoides |
Poison Hemlock | Conium maculatum |
Puncturevine | Tribulus terrestris |
Purple Loosestrife | Lythrum salicaria |
Rush Skeletonweed | Chondrilla juncea |
Saltcedar | Tamarix sp. |
Scotch Thistle | Onopordum acanthium |
Spotted Knapweed | Centaurea stoebe |
Tansy Ragwort | Senecio jacobaea |
White Bryony | Bryonia alba |
Whitetop | Cardaria draba |
Yellow Flag Iris | Iris psudocorus |
Yellow Starthistle | Centaurea solstitialis |
Yellow Toadflax | Linaria vulgaris |