TITLE:
Evaluation of 2,4-D Amine, Glyphosate, 2,4-D Amine plus Glyphosate DMA and 2,4-D Choline/Glyphosate DMA for Their Efficacy on Glyphosate Susceptible and Resistant Canada Fleabane Populations
AUTHORS:
Laura Ford, Nader Soltani, Darren E. Robinson, Robert E. Nurse, Allan McFadden, Peter H. Sikkema
KEYWORDS:
Enlist, Glyphosate Resistant, Height, Injury, Seed Moisture, Yield
JOURNAL NAME:
Agricultural Sciences,
Vol.5 No.11,
September
26,
2014
ABSTRACT: The 2,4-D choline/glyphosate DMA formulation has reduced drift and
volatility compared to the amine or ester formulation of 2,4-D and therefore is
advantageous compared to a tank mix of 2,4-D amine or ester with glyphosate. The
objective of this research was to compare the control of glyphosate susceptible
and glyphosate resistant Canada fleabane with 2,4-D choline/glyphosate DMA with
2,4-D amine, glyphosate, and a tank mix of 2,4-D amine and glyphosate. Ten
rates of 2,4-D amine (0 - 6708 g·ae·ha-1), glyphosate
(0 - 7052 g·ae·ha-1), a tank mix of glyphosate plus 2,4-D amine (0 - 7052 g·ae·ha-1 + 0 - 6708),
and 2,4-D choline/glyphosate DMA (0 - 13760 g·ae·ha-1) were examined
in the greenhouse for the control of two susceptible (GS) and two resistant to
glyphosate (GR) Canada fleabane biotypes. The tank mix of 2,4-D amine plus
glyphosate and 2,4-D choline/glyphosate DMA provided equivalent control of the
GR Canada fleabane biotypes at 35 days after the application (DAA). The 2,4-D
choline/glyphosate DMA treatment was more efficacious than the tank mix on the
GS biotypes. Glyphosate (880 g·ae·ha-1) provided 50%
and 100% control of the resistant and susceptible biotypes, respectively. The
2,4-D choline/glyphosate DMA formulation and the tankmix of 2,4-D amine and
glyphosate provided similar control of GR Canada fleabane.