Post on 31-Dec-2015
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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” 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
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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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100
10 GPA 15 GPA 20 GPA
6.5" Tall 8.5" tall0
10
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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