Role of Some Adjuvants in Enhancing the Efficacy of Herbicides on Forest Species

160A study employing four adjuvants (Ethokem, Multifilm, Regulaid, and Tween-20); three herbicides (glyphosate, hexazinone, and triclopyr); and three forest weeds (aspen, red alder, and white birch) was carried out under greenhouse conditions. The results showed that forest weeds responded to addition of some adjuvants in the herbicide formulations. Of the adjuvants tested, Ethokem (cationic form) gave the best performance. The enhanced efficacy of glyphosate after the addition of adjuvant G3780A was related to greater uptake and translocation of [¹⁴C]-glyphosate. The implication of these findings in relation to reduced cost of herbicide application in a forestry scenario is discussed.