By: Dr. Eric Prostko
1) How do I control ryegrass prior to planting peanuts if I suspect that I might have glyphosate resistance?
Select 2EC @ 8 oz/A or Select Max 0.97EC @ 16 oz/A (or generic equivalents) + 1% v/v COC would be a good choice for this problem. Remember that ryegrass stage of growth is important (Figure 1) and that temperatures below 50 F can significantly reduce control. Higher rates of paraquat (3.5-4.0 pts of 2 lb ai/gal) can also be effective but 2 applications (10-14 days apart) may be needed.
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| Figure 1. Influence of clethodim timing on ryegrass control. |