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Post emergence soybean lync training Jim Martin. Duration of Weed Competition Common Guidelines  Corn  Remove at 2-4” weeds  Soybean  Remove at 6-8”

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Presentation on theme: "Post emergence soybean lync training Jim Martin. Duration of Weed Competition Common Guidelines  Corn  Remove at 2-4” weeds  Soybean  Remove at 6-8”"— Presentation transcript:

1 Post emergence soybean lync training Jim Martin

2 Duration of Weed Competition Common Guidelines  Corn  Remove at 2-4” weeds  Soybean  Remove at 6-8” weeds

3 PROGRAM APPROACH TO MANAGING WEEDS IN SOYBEANS Soil - Residual Herbicide Plus Foliar - Applied Herbicide (Include Herbicides with Different Modes of Action)

4 RESPONSE TO RESISTANCE MECHANISM PRE vs POST APPLICATIONS Waterhemp resistance to some herbicides is more noticeable with Post application than Pre application. HPPD Inhibitors (Callisto, Laudis, Impact, Balance Flexx) PPO Inhibitors (Flexstar, Cobra, Valor, Authority products)

5 Palmer Amaranth Control Pre + Post Versus Post (Fulton Co 2012) PRE + POST POST % Control Rated

6 Palmer Amaranth Control with Liberty vs Prefix as a Post Option Following a Preemergence Herbicide (Fulton Co 2012) % Control Rated

7 Waterhemp Control with Late Post Treatments (Union Co 2012) (% Control) 0.9 oz/A 32 oz/A 2.33 oz/A12.5 oz/A1.5 pt/A - Applied Waterhemp 12“ tall - Rated 12 DAT

8 Impact of Spray Volume and Weed Size on Waterhemp Control with Liberty and Prefix in LL Soybean Liberty 29 oz/APrefix 2.33 pt/A a a Hancock CO 2013

9 FOMESAFEN CARRYOVER ? Do Not Exceed lb Fomesafen/A in Alternate Years. HERBICIDE* ACTIVE INGREDIENTMAX RATE FLEXSTAR Fomesafen1.5 pt/A FLEXSTAR GT 3.5 Fomesafen + Glyphosate5.3 Pt/A PREFIX Fomesafen + Metolachlor2.75 Pt/A * Reflex, Dawn, Rythm are similar to Flexstar

10 Fomesafen Corn Injury SYMPTOMS A, Hager Univ of ILL Veinal Chlorosis or Necrosis Purdue

11 Soybean Injury From Soil-Residual Herbicides

12 Glyphosate and Yellow Flash In Soybean

13 IMPACT OF WHEAT STAND ON MARESTAIL 72 Wheat Heads / FT234 Wheat Heads / FT2

14 6/29-6/30 Harvested Wheat &Bailed Straw 7/3 Planted RR Soybean 7/8 Authority XL + Glyphosate 7/16 Field Appeared to be Clean 7/25 Field with 2”- 10” Palmer 7/26 Applied Top Gun + Glyphosate Photo 7/25


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