Weed Management
Problem Weeds
Problem weeds are considered to be particularly difficult to control by farmers, researchers and extension personnel alike, either because of a lack of information or a lack of effective products. We have conducted trials over the past several years in soybeans and corn, in an effort to increase knowledge in this area.
Weeds are listed according to their common name in Ontario, followed by other known common names. For each problem weed, the biology and identification are described as well as the best control options for that weed in corn and soybeans.
Weed List:
| • Biennial wormwood (Carrotweed) |
| • Bur-cucumber (One-seeded bur cucumber, Nimble kate, Star cucumber) |
| • Canada fleabane (Bitterweed, Blood stanch, Colt's-tail, Hog-weed, Horseweed, Mare's-tail) |
| • Common Chickweed (Chickweed, stellaire moyenne, moron des oiseaux) |
| • Dandelion (pissenlit, dent-de-lion, pissenlit officinal) |
| • Field horsetail (Bottle-brush, Horse-pipes, Horsetail fern, Joint-grass, Mare's-tail, Meadow pine, Pine-grass, Pipe-weed, Scouring-rush) |
| • Horse-nettle (Apple-of-Sodom, Bull nettle, Devil's potato, Devil's tomato, Sand briar, Wild tomato) |
| • Long-spined sandbur (Bur grass) |
| • Proso millet (Broom-corn millet, Panic millet, Proso, Wild proso millet) |
| • Spreading atriplex (Orache, Spreading orache, arroche des champs) |
| • Three-seeded mercury (Copperleaf, Rhombic copperleaf) |
| • Volunteer Corn (Volunteer Maize) |
| • Volunteer Red Clover (clover) |
| • Waterhemp (common waterhemp, tall waterhemp) |
| • Wild Carrot (carotte sauvage, Bird's-nest, Queen Anne's Lace, carotte) |
| • Wire-stemmed muhly (muhlenbergie, feuillee) |
