In the Mid-South, glyphosate is applied from February through April to kill vegetation in fields intended for corn, cotton and soybeans.
At that time of the year the growth stage of winter wheat could range from late tillering to flowering.
Wheat would be especially sensitive to glyphosate at jointing when tillering is complete and the first node is visible on the stem because this is when the seedhead is formed.
In addition, when wheat is exposed to glyphosate at flowering, a reduction in both the number of spiklets produced per seed head and seed weight could affect yield.
LSU AgCenter research has evaluated how simulated drift of glyphosate from first node through early flowering would affect crop growth, yield and yield components of six wheat varieties.
Read about the LSU AgCenter findings at Wheat response to simulated glyphosate drift.