Best Management Practices for application of growth regulator herbicides in soybean. Tom Peters, Extension Sugarbeet Agronomist

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1 Best Management Practices for application of growth regulator herbicides in soybean Tom Peters, Extension Sugarbeet Agronomist

2 Barney, ND, July, 2016 Engenia / Warrant + Engenia / PowerMax PowerMax /PowerMax

3 Considerations before electing to use new soybean technologies You need to read the pesticide label Learn best management practices for correctly applying growth regulator herbicides Develop awareness for sensitive crops; growth regulator herbicide symptomology in sensitive crops

4 It s a balancing act Moorhead, MN, 2016 Managing off-target movement Effective technologies for controlling tough weeds

5 Dicamba Products in DT Soybean Monsanto Company 2.9 lb/g 22 or 44 fl oz /A BASF 5 lb/g 12.8 fl oz/a

6 Tank Mixes and Additives NO AMS as water conditioner 16 mixes (all adjuvants) listed (2/17/17) 19 additional nozzles approved (2/13/ herbicide tank mixes, and 27 adjuvants approved (2/17/2017)

7 Engenia Herbicide Why will AMS be restricted? Application rates: Engenia 560 g/ha AMS 0.5% w/v Test Conditions: Time: 1 day (24 hr), Air flow: 0.5 l/min using 2.5 l tank, Relative Humidity: 5%, Substrate: glass

8 Application Preplant Preemerge Postemerge Through R1 Typically between June 25 th and July 5 th 1 flower any node

9 Doubling wind speed increased drift 70%, readings collected 90 feet downwind from the sprayer Wind Speed Spray Tips Spray Pressure Sprayer Speed From Dave Smith, Mississippi State University, Ag Engineering Formulation Boom Height Tank Cleanout Adjuvants

10 Bigger droplets are heavier droplets 2X increase in droplet diameter equates to 8X increase in droplet weight Monsanto Company data

11 TTI Check websites for more options Spray Tips ExtendiMax when humidity low and temp above 91 F Increase droplet size

12 Larger droplets don t work for all pesticide applications Contact herbicides require smaller droplet spectrum and good coverage Flexstar, Basagran Liberty Fungicides Insecticides

13 Regulatory and small plot work with new formulations looks promising BUT What happens when we spray fields in July?

14 Slide courtesy of Daryl Ritchison

15 Sensitive areas to dicamba soybean* Non-Sensitive Areas Sensitive Areas Threatened and Endangered Species Non-Specialty Crops Specialty Crops Barley, Canola, Corn, Millet, Oat, Rye, Triticale, Wheat DT soybean Native vegetation Woodlands Water Alfalfa, Flax, Field pea, Lentils, Sunflower, SUGARBEET Non DT soybean Dry bean, Potato, Tomato, other fruiting vegetables Cucurbits, Grapes Tree Crops Mom s garden No downwind buffer needed 0-15 MPH wind** 110 downwind buffer 0-15 MPH wind 110 downwind buffer 0-10 MPH wind * based on 0.5 lb dicamba rate ** no inversion conditions Do not spray if wind is blowing towards neighboring fields / areas

16 Dicamba symptomology to sensitive soybean Cupping Cobra damage More pronounced on leaves that develop after exposure

17 Sensitivity of soybean to extremely low concentrations of growth regulators Communicate with your neighbors

18 Why all the concern about drift? We have been using dicamba in corn and small grains for years! When applied and how much we are going to apply! Dicamba on corn Dicamba, Liberty on soybeans 20-Apr 30-Apr 1-May 10-May 20-May 30-May 1-Jun 10-Jun 20-Jun 30-Jun 1-Jul 10-Jul Plant Corn Corn emerged V1 V3 V5 Plant Soybean What else is growing at this time? R1 and Done What else is growing at this time? R2 When do most of the inversions occur during our growing season How many pounds in corn? How many pound in soybean? Estimated use will be 20.5 million pound/year increas from 233,000 lb/yr

19 How much is too much? 8 fl oz of solution in a 1,200 gallon spray tank would result in significant foliar injury to a non-dt soybean field but not necessarily yield loss! ~ 1 gallon of solution in the tank would result in significant yield loss to a non DT soybean field Dr. Kevin Bradley, University of Missouri

20 In Summary Growth regulator herbicides/traits fit but not on every soybean acre Scout fields surrounding target fields for susceptible crops High value/susceptible crops are sugarbeet, tomato, grapes, susceptible soybean Implement strategies that decrease growth regulator herbicide volatility or drift Target early postemergence application Don t overlook tank-cleanout procedures