Post emergence soybean lync training

Jim Martin

Duration of Weed Competition

Common Guidelines

Corn Remove at 2-4” weeds

Soybean Remove at 6-8” weeds

PROGRAM APPROACH TO MANAGING WEEDS IN SOYBEANS

Soil - Residual HerbicidePlus

Foliar - Applied Herbicide

(Include Herbicides with Different Modes of Action)

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)

Palmer Amaranth ControlPre + Post Versus Post (Fulton Co 2012)

Authority MTZ + Liberty

3"

Boundary + Liberty 3"

Valor XLT + Liberty 3"

Liberty 3" Liberty 3" +Liberty

Liberty 5" + Liberty

0

10

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100

PRE + POST POST

% C

ontr

ol

Rated 9-25-12

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

Authority MTZ 18 oz/A Boundary 3 pt/A Valor XLT 4 oz/A0

10

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Prefix 2.33 pt/A Liberty 29 oz/A

% C

ontr

ol

Rated 9-25-12

Waterhemp Control with Late Post Treatments(Union Co 2012)

Cadet Cobra Roundup PowerMax

Prefix Flexstar 0

102030405060708090

100

10 GPA 20 GPA

(% C

ontr

ol)

0.9 oz/A

32 oz/A

2.33 oz/A12.5 oz/A 1.5 pt/A

- Applied 6-14-12 Waterhemp 12“ tall - Rated 12 DAT

Impact of Spray Volume and Weed Size on Waterhemp Control with Liberty and Prefix in LL Soybean

6.5" Tall 8.5" tall0

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90

100

10 GPA 15 GPA 20 GPA

6.5" Tall 8.5" tall0

10

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80

90

10010 GPA 15 GPA 20 GPA

a

bc c

Liberty 29 oz/A Prefix 2.33 pt/A

aa

Hancock CO 2013

FOMESAFEN CARRYOVER?

Do Not Exceed 0.375 lb Fomesafen/A in Alternate Years.

HERBICIDE* ACTIVE INGREDIENT MAX RATE

FLEXSTAR Fomesafen 1.5 pt/A

FLEXSTAR GT 3.5 Fomesafen + Glyphosate 5.3 Pt/A

PREFIX Fomesafen + Metolachlor 2.75 Pt/A

* Reflex, Dawn, Rythm are similar to Flexstar

Fomesafen Corn Injury SYMPTOMS

A, Hager Univ of ILL

Veinal Chlorosis or Necrosis

Purdue

Soybean Injury From Soil-Residual Herbicides

Glyphosate and Yellow Flash In Soybean

IMPACT OF WHEAT STAND ON MARESTAIL

72 Wheat Heads / FT2 34 Wheat Heads / FT2

• 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