ABSTRACT
Canola oil adjuvants and carriers reduced or had no effect on the phytotoxicity of 2, 4-d and glyphosate. Similar results were observed when soybean oil was used instead of canola oil. However, canola oil carriers and adjuvants increased sethoxydim phytotoxicity under field conditions in 1985, but not in 1984. Under controlled environmental conditions canola oil enhanced sethoxydim activity when used as a carrier, although not as an adjuvant. Soybean oil was as effective as canola oil when used as a carrier in the laboratory, but soybean oil carriers were the most effective in the field in 1985, even though both oils did enhance phytotoxicity. When canola and soybean oils were used as adjuvants in the field, the relationship between adjuvant concentration in the spray mix and the phytotoxicity of sethoxydim varied with the application method, as did the relative effectiveness of the two oils.
