Most people are aware that EPA approved new labels for the dicamba products used on dicamba-resistant crops. The following describes major changes in the labels and important restictions. The labels only describe use on the dicamba-resistant crops, therefore eliminating some of the confusion on earlier labels.
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Major changes to dicamba use on DR soybean
- Must use volatility-reduction agent;
- Apply before June 30 or up to R1 stage, whichever comes first;
- Always maintain a 240-ft buffer between last treated row and downwind field edge (roads, mowed grass, tolerant crops can be included in the buffer). The previous label required a 110 ft buffer at 22 oz and a 220 ft buffer at 44 oz. The 44 oz rate has been eliminated from the label.
General restrictions
- Apply only one hour after sunrise through two hours before sunset;
- Apply when wind speed at boom height is between 3 and 10 MPH;
- Do not apply during temperature inversions;
- Do not apply product if sensitive crops or certain plants are in an adjacent downwind field;
- Do not apply if rain is expected in next 48 hours that may result in runoff;
- Maximum boom height of 24”, maximum ground speed of 15 MPH;
- Dicamba specific training still required;
- 57 ft omni-directional buffer required in counties with endangered species (In Iowa, Hardin County and several counties in NE IA are affected by this).
This list isn’t comprehensive, just a quick summary of the label. I assume other products will have similar restrictions.
Source URL: https://crops.extension.iastate.edu/blog/bob-hartzler/use-dicamba-dicamba-resistant-soybean