Sunday, January 29, 2023

North Carolina to require mandatory auxin herbicide training

soybean sprayingFollowing the Environmental Protection Agency’s conditional registration of Engenia and XtendiMax dicamba herbicides for use on dicamba-tolerant cotton and soybeans, North Carolina will have Special Local Need (SLN) labels for the two herbicides.

The two major differences on the SLN label are the wind speed and applicator training.

The federal label allows application of Engenia or XtendiMax at wind speeds up to 15 mph. The North Carolina SLN will limit it to speeds up to 10 mph. This is because of the intermingling of a diverse number of crops among soybeans and cotton.

In addition, North Carolina will require mandatory training for application of auxin herbicides, which include Engenia and XtendiMax.

Specifically, the SLN labels will state that “the producer, certified applicator or person responsible for the application on cotton or soybean, in-crop, must attend ‘Auxin Herbicides – Best Management Practices’ training that is approved by the North Carolina Department of Agriculture.” Dates and locations are pending.

BASF received EPA registration for Engenia herbicide, including supplemental labeling for use on DT (dicamba-tolerant) cotton (XtendFlex) and soybean (Roundup Ready 2 Xtend), on Dec. 20, 2016. This is the second dicamba product recently approved by the EPA for use on DT cotton and soybeans.

XtendiMax with VaporGrip Technology, a Monsanto product, was granted supplemental labels for DT cotton and soybean on Nov. 9, 2016. XtendiMax already had a label for typical dicamba uses but was not promoted or sold in North Carolina.

“The Engenia supplemental labels for DT crops are, in my opinion, a bit confusing,” Alan York, a North Carolina State University emeritus professor of crop and soil science, said in a news release. The supplemental labels at times refer the reader to the full label (referred to as product container label on the supplemental labels). The confusion arises because directions on the product container label sometimes conflict with the directions on the supplemental labels.

For example, the product container label allows aerial application whereas the supplemental labels expressly prohibit aerial application. There is also conflicting information concerning application rates, tank mixes and adjuvant use. Remember, if you are applying Engenia to DT cotton or soybeans, follow specific directions on the supplemental labels.

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