There may be a small price increase in a glyphosate and 2,4-D mix for this spring. Even if there is, Mark Loux, weed control specialist at Ohio State University, says it's still the most versatile and economic burndown treatment for many situations.
He made those comments in a recent issue of the Ohio C.O.R.N. Extension newsletter. At the time it went to print, there were rumors that 2,4-D might be in short supply due to production issues. However, Bill Johnson, Purdue University weed control specialist, says that is not the case. As far as he knows, there should be adequate supplies of product available.
There are other burndown options, but the glyphosate and 2,4-D mixture tends to produce good results. Remember that there are several factors to consider if you want to get good burndown, specialists say.
Glyphosate will not perform well if sprayed in cool weather. The product must be translocated to the roots, and the plants need to be actively moving nutrients up and down within the plant. The choice of product may also depend upon whether you're burning down weeds that have grown up in the field, or whether you're taking down a cover crop planted on purpose last fall.
Cover crop gurus say that even annual ryegrass can be controlled in good order, but that you can't be sloppy with decisions about what to put into the tank, or with spraying procedures. Doing your homework and talking to someone who has raised cover crops and burnt them down successfully would be a good move if you have cover crops this year, especially if it's the first time you have tried them, and if you're no-tilling into the cover crop.Many people are turning to cove r crops because of several advantages, including deep rooting to improve soil health, and the ability to latch on to nitrogen from the year before that would otherwise be lost. Eventually, as the cover crop decays, it becomes available to the crop. The biggest obstacle is burndown. Plan ahead and follow your plan, experts say.