According to WSSA the definition for herbicide resistance: is the inherited ability of a plant to survive and reproduce following exposure to a dose of herbicide normally lethal to the wild type. In a plant, resistance may be naturally occurring or induced by such techniques as genetic engineering or selection of variants produced by tissue culture. |
According to WSSA the definition for herbicide tolerance: is the inherent ability of a species to survive ans reproduce after herbicde treatment. This implies that there was no selection or genetic manipulation to make the plant tolerant, it is naturally tolerant. |
Weed Species | Large Crabgrass | Redroot Pigweed | Smooth Pigweed | Green Pigweed | Giant Ragweed | Common Ragweed | Canada Ragweed |
Chatham-Kent | Group 1 | Group 2 Group 5 Group 6 Group 7 | Group 2 Group 5 Group 6 | Group 2 | Group 2 | Group 2 | |
Elgin | Group 2 Group 6 | Group 2 Group 5 | Group 2 | ||||
Essex | Group 2 Group 6 | Group 6 | Group 2 Group 5 Group 6 | Group 2 Group 9 | Group 2 Group 9 | ||
Huron | Group 2 Group 7 | Group 2 Group 5 | Group 2 | ||||
Lambton | Group 2 | Group 2 Group 5 | Group 2 Group 9 | Group 2 | |||
Middlesex | Group 2 Group 7 | Group 2 Group 5 Group 7 | Group 2 | ||||
Oxford | Group 2 | Group 2 Group 5 | Group 2 | ||||
Perth | Group 2 | Group 2 | Group 2 |
Weed Species | Waterhemp | Lamb’s-quarter | Eastern Black Night Shade | Canada Fleabane | Giant Foxtail | Green Foxtail | Field Pepper Grass | Cocklebur |
Chatham-Kent | Group 9 | Group 2 Group5 | Group 2 | |||||
Elgin | Group 2 Group 5 | Group 2 | Group 2 Group 9 | Group 2 | ||||
Essex | Group 2 Group 5 Group 9 | Group 2 | Group 2 Group 22 | Group 2 | Group 22 | |||
Huron | Group 5 | Group 2 | Group 2 Group 9 | Group 2 | ||||
Lambton | Group 2 Group 5 Group 9 | Group 2 Group 5 | Group 2 Group 9 | Group 2 | Group 2 | Group 2 | ||
Middlesex | Group 2 Group 5 | Group 2 | Group 9 | |||||
Oxford | Group 5 | Group 2 | Group 2 Group 9 | Group 2 | Group 2 | |||
Perth | Group 2 | Group 2 | Group 2 Group 9 | Group 2 |
Legend: Example Herbicide(s) for each Group | |
Group 1: | Assure ll |
Group 2: | Pursuit, Classic, Pinnacle |
Group 5: | Aatrex, Sencor |
Group 6: | Basagran, Pardner |
Group 7: | Lorox |
Group 9: | Glyphosate, Roundup Weathermax |
Group 22: | Reglone, Gramoxone |