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Dry Edible Beans: Plan Your Pre-emergence Weed Attack

May 28, 2020

Agronomy, Crop Management, Grain, Market Update, Soybean, Technology

Looking at 2020 contract prices and market opportunities, we have seen a lot of growers shift to dry edible beans this year. So, with #plant20 in full swing, we wanted to take a look at the pre-emerge herbicide options our customers have for dry edible beans this season—to help keep them ahead of weed pressures.

There aren’t many options when it comes to herbicides for dry edible beans because there are no GMO varieties on the market and post-emergence control options are limited. Starting with precision weed control, using the herbicides and mechanical tools that are available, is the most effective strategy in producing a clean, good yielding crop.

Long story-short, with weather planting challenges and crop rotation shifts, you need a plan this growing season to make sure that you are maximizing your operation’s growing potential. To help with that, we have put together a list of pre-emerge herbicide options, along with the implications and efficacy of each on weeds.

 

Weed Pressure Challenges

This past fall was wet making it hard to get a crop out, much less complete any tillage preparation for spring planting. Coupled with those reduced or no-till operations that made a crop shift, weeds may create a lot of challenges for edible dry bean production. North Dakota State University’s 2020 weed control guide is a good place to start, and served as the resource for the herbicide table below.

Arthur Companies Grain Elevators Behind Bean Field

Keep in Mind:

  • Incorporate immediately after application: Prowl, Sonalan, Treflan
  • Later incorporation after application: Prowl H20
  • Pre-emergence applications require rainfall within 7 days, rotary hoe if no rainfall event occurs: Dual Magnum, Dual II Magnum, Outlook, Pursuit
  • Soil type considerations:
    • Dual Magnum, Dual II Magnum: Reduce rate to 1 pt/A on coarse-textured soils with low organic matter
    • Outlook: Reduce rate to 12 oz/A on coarse-textured soils with low organic matter
    • Permit: Reduce the rate to 0.5 oz/A on lighter textured soils with low organic matter
  • Established weed pressures:
    • Prowl: Velvetleaf control
    • Dual Magnum, Dual II Magnum: Yellow nutsedge control
    • Outlook: Pigweed and nightshade control
    • Permit: Will not control ALS-resistant weed species
    • Pursuit: Will not control common ragweed
  • Weather Considerations:
    • Permit: Can cause injury under cool and wet growing conditions
    • Pursuit: DO NOT apply if cold and/or wet conditions are present or predicted to occur within one week of application; DO NOT apply if planting is delayed and frost is likely to occur prior to maturity
  • Future Crop Rotations:
    • Permit: DO NOT plant sugar beets within 21 months of application
    • Pursuit: DO NOT plant sugar beets or canola within 40 months of application; DO NOT plant potatoes within 26 months of application.
  • Spartan Charge (Spartan & Aim combo) and Spartan Elite (Spartan and Dual combo): Can be effective options when it comes to pre-plant or pre-emerge applications. However, when Spartan is used at higher rates in the wrong field situations, there is the potential for severe crop injury to occur. It is extremely important to evaluate each field individually when it comes to Spartan use. Soil test if you are able, and pay close attention to soil pH, soil texture, and organic matter. Soil pH is far and away the main driver when it comes to water solubility of the herbicide and potential crop damage. As soil pH increases and nears 8, we need to adjust application rates down. In fields where soil pH is around 8, finer soil texture and higher organic matter can serve as a buffer to water solubility when making the decision whether or not to apply Spartan. However, each field needs to be evaluated on an individual basis, and there are certain situations where we are much better off to lean on one of the yellows or a group 15. Don’t hesitate to contact your agronomist for assistance in making this decision!

 

With all herbicides there are considerations and choices to make in terms of future cropping rotation strategy. Our Arthur Companies team of agronomists is here to help you “weed” through each product’s label information and formulate which tank mixes will best fit your operation’s needs—and we’ll keep your end-goal and long-term crop rotation strategy at the top of that conversation.

We know that these decisions are timely. We are always just a phone call away. Give us a call, we’ll meet you where you are, and keep a six-foot distance, to help you find the solution that works best for you.

Text Box: Soil Applied PPIs Product Rate Control Timing Method Prowl 2.4 to 3.6 pt 3.3EC 2.1 to 3 pt 3.8ACS (1 to 1.5 lb) Grass and some broadleaf weeds. Poor wild oat and no wild mustard control. PPI Spring or Fall PPI within 24 hours after application. Apply fall applications when soil temperature is less than 45 F to reduce fall herbicide degradation. Adjust rate for soil type. Use EC formulation in spring and 10G formulation in fall for more consistent herbicide activation in soil. Refer to label for tank-mixtures. A1-2 B1-2 B7 E11 Treflan / generic trifluralin3 1 to 2 pt EC 5 to 10 lb 10G (0.5 to 1 lb) Sonalan (ethalfluralin3) 1.5 to 4.5 pt EC (0.55 to 1.69 lb) 5.5 to 11.5 lb 10G (0.55 to 1.15 lb) Dual/II/Magnum (S/metolachlor15) 1 to 2 pt EC (0.95 to 1.9 lb) Grass and some broadleaf weeds. Shallow PPI or PRE Shallow PPI improves consistency of weed control. PRE requires precipitation for herbicide activation. Adjust rate for soil type and OM. Allow a 70 day PHI. A1-2 B1 F3 Outlook / generic dimethenamid15 10 to 21 fl oz EC (0.47 to 1 lb) Shallow PPI, PRE, or EPOST up to 3rd trifoliate Spartan Elite (s-metolachlor15 & sulfentrazone14) 20 to 26 fl oz EC (0.98 to 1.28 lb & 1.75 to 2.25 oz) Shallow PPI or PRE ND Section 24c label indemnification agreement required - user assumes all risk of crop injury. Do not use on coarse texture soils or soil with <1.5% OM. Adjust rate for soil type and soil pH. Rainfall required for activation. A1-2 E12 F1 Spartan Charge (carfentrazone14 & sulfentrazone14) 3.75 to 5.75 fl oz SE (0.16 to 0.25 oz & 1.48 to 2.26 oz) Small-seeded broadleaf weeds. Shallow PPI or PRE Permit (halosulfuron2) CANNOT BE ARIALLY APPLIED 0.5 to 0.67 oz DF (0.38 to 0.5 oz) Many broadleaf weeds and yellow nutsedge. Shallow PPI, PRE, or POST up to dry bean flowering PRE requires precipitation for herbicide activation. POST: Apply with NIS at 1 to 2 qt/100 gal water. Permit: PRE controls additional weeds than POST, including pigweed and lambsquarters. Refer to label when tank-mixing with other herbicides. Will not control ALS resistant weeds. A3 A5-8 E8 F1 Pursuit (imazethapyr2) 2 fl oz SL (0.5 oz) Small broadleaf weeds.