The influence of Adjuvants and Environment on Absorption and Translocation of Imazaquin in Pitted Morningglory [Ipomoea Lacunosa (L.)]

A nonionic surfactant, a petroleum oil-based adjuvant, and a soybean [Glycine max (L.) Merr.] oil-based adjuvant were foliarly applied separately with ¹⁴C-radiolabeled ammonium salt of imazaquin {2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acid} herbicide to pitted momingglory (Ipomoea lacunosa L.).Treated plants were grown in environmentally controlled growth chambers at several combinations of air temperature and relative humidity (RH). After 48 h, absorption and translocation of the ¹⁴C-herbicide were greater at 95 than at 40% RH and at 35 than at 27 or 18°C. Translocation of the ¹⁴C-radiolabel was often increased by the addition of the nonionic surfactant or the petroleum oil-based adjuvant over that with soybean oil-based adjuvant or with no adjuvant added to the herbicide solutions.