Dicamba-resistant kochia confirmed in Nebraska
The owner of the Nebraska field exhibiting high dicamba resistance reported that the field had been in irrigated continuous corn for the previous 10 years and that dicamba had been frequently applied in tank-mixtures with glyphosate or atrazine to 1-inch tall kochia. In addition, glyphosate plus dicamba or 2,4-D had been applied on wheat stubble in the pivot corners to suppress weed growth during the fallow period.
Soybean with resistance to dicamba has been developed and its commercialization is expected in 2015 or 2016, pending USDA approval. This new technology will permit dicamba use for postemergence weed control in soybean. Farmers or advisors who plan to use dicamba to manage kochia populations that are already resistant to glyphosate or to triazine- and ALS-inhibiting herbicides should exercise extreme caution to avoid selecting populations that are resistant to dicamba.
Dicamba should only be used in tank-mixtures or in sequence with a herbicide(s) with a different mechanism(s) of action that is effective at controlling kochia. Non-chemical weed management practices such as tillage and crop rotation also should be incorporated into the weed management program to help prevent kochia seed production.
Finally, producers should monitor fields for plants that escape dicamba applications and remove them before they produce seed.
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