HERBICIDE RESISTANT WEEDS IN OREGON |
| Weed | Situation | Herbicide Mode of Action | Year |
Italian Ryegrass
(Lolium multiflorum) | wheat | A/1 - ACCase inhibitors
(diclofop-methyl) | 1987 |
Wild Oat
(Avena fatua) | wheat | A/1 - ACCase inhibitors
(diclofop-methyl, fenoxaprop-P-ethyl) | 1990 |
Wild Oat
(Avena fatua) | cropland | K1/3 - Dinitroanilines and others
(pronamide = propyzamide) | 1990 |
Kochia
(Kochia scoparia) | wheat | B/2 - ALS inhibitors
(chlorsulfuron, metsulfuron-methyl, triasulfuron) | 1993 |
Prickly Lettuce
(Lactuca serriola) | wheat | B/2 - ALS inhibitors
(chlorsulfuron, metsulfuron-methyl, triasulfuron) | 1993 |
Russian Thistle
(Salsola iberica) | wheat | B/2 - ALS inhibitors
(chlorsulfuron, metsulfuron-methyl, triasulfuron) | 1993 |
Redroot Pigweed
(Amaranthus retroflexus) | mint | C1/5 - Photosystem II inhibitors
(terbacil) | 1994 |
Annual Bluegrass
(Poa annua) | grass seed | N/16 - Thiocarbamates and others
(ethofumesate) | 1994 |
Annual Bluegrass
(Poa annua) | grass seed | C2/7 - Ureas and amides
(diuron) | 1994 |
Annual Bluegrass
(Poa annua) | grass seed | C1/5 - Photosystem II inhibitors
(atrazine) | 1994 |
Common Groundsel
(Senecio vulgaris) | mint | C3/6 - Nitriles and others
(bromoxynil) | 1995 |
Downy Brome
(Bromus tectorum) | kentucky bluegrass | B/2 - ALS inhibitors
(imazamox, primisulfuron-methyl, sulfosulfuron) | 1997 |
Smallseed falseflax
(Camelina microcarpa) | wheat | B/2 - ALS inhibitors
(chlorsulfuron, metsulfuron-methyl) | 1999 |
Italian Ryegrass
(Lolium multiflorum) | orchards | G/9 - Glycines
(glyphosate) | 2004 |
Downy Brome
(Bromus tectorum) | grass seed | A/1 - ACCase inhibitors
(clethodim, fluazifop-P-butyl, quizalofop-P-ethyl, sethoxydim) | 2005 |
Shepherd's-purse
(Capsella bursa-pastoris) | alfalfa | C1/5 - Photosystem II inhibitors
(hexazinone, metribuzin) | 2007 |
Russian Thistle (Salsola iberica) is the most widespread resistant weed of Oregon