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Nothing Truly New On Herbicide Front For 2012

TAGS: Extension
Nothing Truly New On Herbicide Front For 2012
Trend toward more soil residual herbicides ahead of glyphosate continues.

Anyone who wants totally brand new chemistry labeled already for use as herbicides in 2012 will be disappointed. That's the word from Purdue University Extension weed specialists Bill Johnson and Tom Jordan.

There are some new names, although not all of those are approved yet. Check the February issue of Indiana Prairie Farmer for the most complete rundown on what you should see this year as far as names of herbicides.

The new names represent chemistries already on the market, Johnson says. In some cases, it's a different formulation or combination or previously existing active ingredients. In at least one case, it's simply a generic release of a product already on the shelves.

The trend continues to be toward residual soil-applied products that can be applied before planting, or some with residual activity that can be applied early post, to help aid glyphosate in control of problem weeds. Some of the new mixes, along with those already on the market released in the past few seasons, will help pick up glyphosate-resistant weeds.

When Roundup Ready soybeans first hit the market, many people were advised that they no longer needed a residual herbicide, and could handle their weed problems with either one or two applications of glyphosate during the season. As more resistance has shown up, and in new species, that philosophy has changed, Johnson says.

There is still debate amongst weed scientists as to whether applying a residual with a single mode of action for killing a glyphosate-resistant weed and then following with glyphosate to kill other things truly protects against resistance. Typically there are two modes of action, but they are applied at different times. If you're applying a residual herbicide and glyphosate which is applied later, the residual could be gone before glyphosate is applied. So the weed population still only sees one mode of action at a time.

Some of the changes could simplify stocking and marketing issues for chemical retail dealers, the specialists note. As far as truly different tools in the weed control game, you won't see them this year. And the pipeline is relatively dry for the next few years. The big changes ahead would be with the approval of 2,4-D tolerant crops and dicamba tolerant crops later in the decade, the specialists noted.
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