Abstract
Response of two Bidens species (B. tripartita and B. frondosa) to bensulfuron methyl (Methyl=α-(4, 6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-o-toluate) was compared and factors accounting for their differential response were investigated. A greenhouse experiment showed that B. tripartita had greater tolerance to the herbicide than B. frondosa, although the latter had moderate tolerance which was comparable to that of barnyardgrass (Echinochloa crusgalli). Absorption of 14C from aboveground (shoot) tissue following 14C-bensulfuron methyl application was more rapid in B. frondosa than in B. tripartita. Absorption from cotyledon was also much greater in B. frondosa and absorbed 14C was distributed throughout the shoots of the species. Differential foliar absorption and translocation between the Bidens species may partly explain their differential response to bensulfuron methyl.
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