Published online by Cambridge University Press: 20 January 2017
Absorption and translocation of aminocyclopyrachlor (AMCP) was investigatedin black walnut. Radiolabeled AMCP was applied foliarly as a free acid, andbasally as a free-acid-formulated oil-soluble liquid and as a methyl esteremusifiable concentrate. Maximum absorption was 68% for the methyl ester,47% for the free-acid oil-soluble liquid, and 8% for the free acid whenevaluated as percent applied. When recovered AMCP was presented as Bq g−1, no difference was observed in AMCP absorption ortranslocation of 14C-labeled material out of treated plant parts.Recovery of applied radiolabeled material in the roots from basalapplications was 5 to 11% 72 h after treatment (HAT), compared with 0.8%recovery from a foliar application. Regardless of chemical form orformulation type, comparable injury was observed within 72 HAT despite lowlevels of translocation.
Associate Editor for this paper: Franck E. Dayan, USDA-ARS.