Premium
Influence of picloram on Cirsium arvense (L.) Scop, control with glyphosate
Author(s) -
O'SULLIVAN P.A.,
KOSSATZ V.C.
Publication year - 1982
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1982.tb00170.x
Subject(s) - glyphosate , cirsium arvense , thistle , picloram , shoot , biology , agronomy , horticulture , botany
Summary Low rates of picloram in mixture with glyphosate provided a rapid enhancement of the onset of injury to the shoots of Cirsium arvense (Canada thistle or creeping thistle) under field (0.07+1.0 and 0.07+1.5 kg ha −1 ) and greenhouse (0.035+0.42 and 0.07+0.84 kg ha −1 ) conditions. Picloram slightly reduced the amount of 14 C‐glyphosate absorbed at 24 and 48 but not 72 h after treatment. Movement of 14 C‐glyphosate from the treated leaves to the shoot apex, remainder of the shoot and roots was reduced in the presence of picloram. Necrosis of the treated leaves above the treated spots was evident, presumably indicating acropetal movement of either or both herbicides. With the picloram + glyphosate mixtures there was increased shoot regrowth over glyphosate alone at 1 year after treatment under field, and with certain mixtures at 18 days and 4 weeks after treatment under greenhouse conditions. Following application of the mixtures, accumulation of glyphosate in the shoots may be responsible for the enhanced onset of shoot injury while failure of enough glyphosate to translocate to, and cause death of, the roots may be responsible for the increased shoot regrowth over glyphosate alone.