Residues of 2,4-D and picloram in aspen poplar and soil after application with a roller

Cessna, A.J.; Waddington, J.; Bittman, S.

Canadian Journal of Plant Science 69(1): 205-212


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps89-022
Accession: 001933105

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The use of wipers for herbicide application to brush regrowth in pastures was suggested for reducing damage to the forage understory. Estimates of picloram in the soil around the base of aspen poplar (Populus tremuloides) regrowth and of picloram and 2,4-D in poplar tissues were made 84 and 39 d, resp., after a roller application of the herbicides in a 7.3:1 w/w 2,4-D: picloram mixture. Bioassay revealed that 11-16% of the picloram applied reached the soil and that, when the herbicide mixture was applied at a high enough concn to kill the trees, sufficient picloram reached the soil around them to affect legume establishment. Chemical assay revealed that only about 2% or less of the picloram and 2,4-D remained in the poplar tissue and that >80% of this was in the leaves. These residues were unlikely to cause environmental problems because of the small quantities and the slow release from poplar tissue by leaching and decay. The remainder of the applied picloram and 2,4-D was unaccounted for and was assumed lost through metabolism and photochemical degradation.