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7 Herbicide Application Changes in 2018 for Dicamba-Tolerant Crops
Wondering what changes have been made for the application of 2018 dicamba formulations for dicamba-tolerant systems? Aaron Hager, University of Illinois Extension weed specialist, summarizes what applicators need to know regarding amendments to the XtendiMax, Engenia, and FeXapan labels for 2018.
1. XtendiMax, Engenia, and FeXapan are now restricted-use products (RUP), permitting only certified applicators to purchase and/or apply these products.
2. Prior to applying these products in 2018, applicators must complete dicamba or auxin-specific training. Two of the labels further specify that training will be required annually.
3. Record keeping is required for applications of these products. See the updated labels for the entire list of records that must be completed within 14 days of each application and retained for a period of two years.
4. All applications, regardless of application timing, are limited to periods when maximum wind speeds are not greater than 10 mph (reduced from 15 mph). Wind speed and direction are to be recorded at boom height.
5. All applications are limited to between sunrise and sunset. This is wider than the time frame that states like Missouri and Tennessee set for dicamba applications in 2017. Last July, the Missouri Department of Agriculture restricted applications to between 9 a.m. and after 3 p.m. Last summer, the Tennessee Department of Agriculture set application times only from 9 a.m. to 4 p.m. The reason? Temperature inversions can key off-target dicamba movement that may occur in early evening, late evening, and nighttime.
6. A record of compliance with spray system cleanout procedures, as per label guidelines, is required.
7. Enhanced language pertaining to susceptible crops. An example is “DO NOT APPLY this product when the wind is blowing toward adjacent nondicamba-tolerant susceptible crops; this includes NONDICAMBA-TOLERANT SOYBEANS AND COTTON.”
The intent of these label amendments is to reduce sensitive plant species’ exposure to dicamba primarily through physical movement (i.e., drift during the application or particle movement during temperature inversions) or via dicamba residues dislodged from application equipment. These amendments, however, do not address exposure through volatility.
The RUP classification of these products requires anyone who purchases or applies them to be licensed by the state of Illinois as either private or commercial applicators. A private applicator license is required if you apply RUPs on lands you own or control in the production of an agricultural commodity, whereas a commercial license is required for persons who apply pesticides for hire, apply pesticides to the property of their employer only, or for government employees who apply pesticides during the normal course of duty.
Dicamba or auxin-specific training must be completed prior to application of these products in 2018. The training is required for any labeled application of these products (i.e., not only for application to dicamba-resistant soybean varieties).
In Illinois, agricultural organizations are working to assist the industry with meeting the training requirement prior to the 2018 crop season. Go to http://www.ifca.com/illinoisdicambatraining.com after November 15 for a list of scheduled training events around Illinois and to register for these events.