Statewide PROHIBITED GENERA Noxious 21. Vipers Bugloss (Echium vulgare) Weed List – All plants and plant parts in the generas 22. Yellow Hawkweed (Hieracium caespitosum) of Cytisus, Genista, Spartium, and Chamaecytisus Statewide Containment Noxious Weed List: Basic Weed additionally including “all” subtaxa of these plant genera are prohibited in Idaho. 1. Canada Thistle (Cirsium arvense) 2. Curlyleaf Pondweed (Potamogeton crispus) Statewide EDRR Noxious Weed List: 3. Dalmation Toadflax (Linaria genistifolia ssp. Dalmatic) Management 1. Brazilian Elodea (Egeria densa P.) 4. Diffuse Knapweed (Centaurea diffusa) 2. Common/European Frogbit (Hydrcharis morsus-ranae) 5. Field Bindweed (Convolvulus arvensis) 3. Fanwort (Cobomba caroliniana) 6. Flowering Rush (Butomus umbelltus) 4. Feathered Mosquito Fern (Azolla pinnata) 7. Hoary Alyssum (Berteroa incana) 5. Giant Hogweed (Heracleum mantegazzianum) 8. Houndstongue (Cynoglossum officinale) 6. Giant Salvinia (Salvinia molesta) 9. Jointed Goatgrass (Aegilops cylindrical) 7. Hydrilla (Hydrilla verticillata) 10. Leafy Spurge (Euphorbia esula) 8. Iberian Starthistle (Centaurea iberica) 11. Milium (Milium vernale) 9. Policeman’s Helmet (Impatiens glandulifera) 12. Oxeye Daisy (Chrysanthemum leucanthemum) 10. Purple Starthistle (Centaurea calcitrapa) 13. Perennial Pepperweed (Lepidium latifolium) 11. Squarrose Knapweed (Centauria squarrosa) 14. Plumeless Thistle (Carduus acanthoides) 12. Syrian Beancaper (Zygophyllum fabago) 15. Poison Hemlock (Conium maculatum) 13. Tall Hawkweed (Hieracium piloselloides) 16. Puncturevine (Tribulus terrestris) 14. Variable-Leaf-Milfoil (Myriophyllum heterophyllum) 17. Purple Loosestrife (Lythrum salicaria) 15. Water Chestnut (Trapa natans) 18. Rush Skeletonweed (Chondrilla juncea) 16. Water Hyacinth (Eichhornia crassipes M.) 19. Saltcedar (Tamarix) 17. Yellow Devil Hawkweed. (Hieracium glomeratum) 20. Scotch Thistle (Onopordum acanthium) 18. Yellow Floating Heart (Nymphoides pelata) 21. Spotted Knapweed (Centaurea maculosa) 22. Tansy Ragwort (Senecio jacobaea) Statewide Control Noxious Weed List: 23. White Bryony (Bryonia alba) 1. Black Henbane (Hyoscyamus niger) 24. Whitetop (Cardaria draba) 2. Bohemian Knotweed (Polygonum bohemicum) 25. Yellow Starthistle (Centaurea solstitialis) 3. Bufflobur (Solanum rostratum) 26. Yellow Toadflax (Linaria vulgaris) 4. Common Crupina (Crupina vulgaris) Noxious Weed Control 5. Common Reed (Phragmites australis) County Noxious Weeds: 6. Dyer’s Woad (Isatis tinctoria) 1. Common bugloss (Anchusa officinalis) 10905 N RAMSEY ROAD 7. Eurasian Watermilfoil (Myriophyllum spicatum) 2. Kochia (Kochia scoparia) 8. Giant Knotweed (Polygonum sachalinesnse) Hayden, ID 9. Japanese Knotweed (Polygonum cuspidatum) 208-446-1290 10. Johnsongrass (Sorghum halpense) Kootenai County does not discriminate against TTY 208-446-2145 11. Matgrass (Nardus stricta) individuals or groups on the basis of disability in 12. Meadow Knapweed (Centaurea pratensis) the admission or access to, or treatment in, its [email protected] 13. Mediterranean Sage (Salvia aethiopis) public meetings, programs, or activities. www.kcweeds.com 14. Musk Thistle (Carduus nutans) Requests for assistance or accommodations can 15. Orange Hawkweed (Hieracium aurantiacum) be arranged by contacting the Noxious Weed 16. Parrotfeather Milfoil (Myriphylum aquaticum) Control Department at (208) 446-1290 or 17. Perennial Sowthistle (Sonchus arvensis) County Administration Office TTY (208)446- 18. Russian Knapweed (Acroptilon repens) 2145 with 3 days advance notice. 19. Scotch Broom (Cytisus scoparius) 20. Small Bugloss (Anchusa arvenis) Basic Weed Management Herbicides are not as useful for seed mixes that suit your situation. If in the heat of the summer you have grazing animals or you are

(July through early growing hay, the grass mixtures will be During the spring (April September). different. through June), weeds are small

enough to control with these methods:  Mechanical control - mowing, weed-  Chemical controls - Fertilizer is eating, cutting and bagging flower heads important to weed control. Giving work best for summer weed control. grasses high nitrogen fertilizers will  Prevention - using clean equipment that make them healthy, forcing out weeds. is not contaminated with weed parts or Fertilizing can be done in the spring seed.  Chemical controls - Temperatures above 85ºF will cause plants to slow and/or fall, but dry fertilizers must be

their growth to conserve energy and watered in to get to the plant roots.  Mechanical control - mowing, weed- water, which means the plant doesn’t Dry fertilizers that stay on the ground for eating or cutting/bagging flower heads to take in the herbicide. 4-5 days, without water, begin to break keep weeds from producing seed. down and are not effective for plant

 Also, high temperatures cause quick growth.  Cultural control – Seeding using grass evaporation of sprays, making the seed mixes and fertilizers to encourage herbicide disappear before the plant is fertility in bare areas. Buy grass seed affected by the chemical. Ideal spraying with 0% weed seeds and be sure the grasses will grow in our area. temperature is between 50 F and 80 F.

 Chemical controls - keeping the edges During the fall (mid- of the fields and fences clean (for safety September through October), and visibility) with glyphosate as the cooler, wetter weather ingredients (i.e. Roundup). For grassy begins, weeds grow another areas, products with 2,4-D plus a batch of leaves at ground level. If herbicide surfactant*, will work on noxious weeds is sprayed, the plant will go into the winter (for example spotted knapweed, season with damaged roots and at risk to common tansy and hawkweed). For cold weather injury. The chemicals Dalmatian toadflax, oxeye daisy and mentioned will work when sprayed in spring leafy spurge a dicamba product (i.e. and/or fall. Any questions or concerns about this Banvel) will damage the root and control information call our office at 208/446-1290 the plant. or email us at:  Cultural control - Over Seeding is planting grass seed in areas that are bare [email protected] *surfactant is an additive that is mixed with herbicide to help it stick, spread or penetrate a or have little grass in them. This can be plant leaf. done in our area in the fall, early winter or spring. Visit your local farm stores