2/19/2018 - wia.unl.edu WIA_Kruger.pdf · 2/19/2018 1 weedscience.unl.edu February 23, 2018 Greg Kruger 2018 Women In Agriculture Conference, Kearney, Nebraska Weed Science and Pesticide

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February 23, 2018Greg Kruger

2018 Women In Agriculture Conference, Kearney, NebraskaWeed Science and Pesticide Application Technology Specialist

West Central Research and Extension Center

2017 Weed Control and Its Implications on the Future of Weed Management

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Top Topics from 2017

1. Management of Herbicide Resistant Weeds2. Off-target Movement of Dicamba

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Weed resistance is NOT new...

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Weed resistance is NOT new...

• First reported herbicide-resistant weed

Wild carrot

1957

2,4-D

• Barnyardgrass

Thousands of years of hand-weeding rice forced an evolutionary response

Rice

Barnyardgrass

Evolved Barnyardgrass

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US Herbicide/Herbicide Resistant Trait Timeline

1945

• Introduction of the first chemical herbicide (2,4-D)

• Chemicals will solve weed management problems

1957

• First reported herbicide-resistant weed

• Spreading dayflower, Hawaii (Hilton 1957)

1996

• Introduction of Roundup Ready soybean

• Resistance to glyphosate will never happen

2000

• First glyphosate resistant broadleaf weed in the US

• Horseweed, Delaware (VanGessel 2001)

2003• First glyphosate and ALS-Inhibitor resistant horseweed population found

2009• Glufosinate resistant trait market increases to manage glyphosate-resistant weeds

2015+

• ALS-Inhibitor, Glufosinate, Dicamba, and 2,4-D resistant traits are introduced

• Herbicide-resistant traits will solve problems created by glyphosate resistance

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Resistant Weed Biotypes Across the Years

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Resistance by MOA

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Glyphosate-resistant Weeds

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Introduction of New Herbicide MOAs

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Resistance Management Practices

Tank-mixes

Herbicide MOA

Rotation

Crop Rotation

Tillage?

The new challenge….

How do we do this sustainably,

while maintaining economic

profitability with a mission of

reducing pesticide usage?

Effective No-Till is predicated

upon effective POST herbicide

options

Old challenges are new again….

Sprayer cleanout

Tank-mix contaminations

Crop injury

Sprayer overlap

Herbicide carryover

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Start clean and stay clean

No weeds at

planting

Overlay residual

herbicides First line of defense

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April 14

Before planting

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April 14

At planting

June 17

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April 14

Mid-season

June 17July 11

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April 14

At harvest

June 17July 11October 21

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Seedbank Management

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Seedbank Management

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Seedbank Management

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Seedbank Management

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Glyphosate-resistant marestail

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BURNDOWN:Durango (36 oz) +

Valor (2 oz) + Prowl

H20 (1 pt)

POST:

Durango (48 oz)

POST:

Flextar GT (44 oz) +

Durango (16 oz)

POST:

Cobra (12 oz) +

Resource (5 oz)

Interrow Cultivation

POST:

Ultra Blazer (1.5 pt)

Herbicide Cost: $94/a

Photo: 8/5/12

Waterhemp

Fremont, NE

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2,4-D Resistant Waterhemp

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Kevin Bradley, University of Missouri

Official dicamba-related injury investigations as reported by state departments of agriculture (as of October 15, 2017).

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Kevin Bradley, University of Missouri

Estimates of dicamba-injured soybean acreage as reported by state extension weed scientists (as of October 15, 2017).

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Dicamba: Nebraska Update on Soybean Injury

By Amit Jhala, University of Nebraska-Lincoln Weed Specialist. July 24, 2017

“Most soybean fields I visited had very consistent dicamba injury symptoms from one end to the other, suggesting off-target movement through volatility.”

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Soybean Dose Response (28 DAT)

1 X ½ X ¼ X 1/8 X 1/16 X 1/32 X 1/64 X

1/128 X 1/256 X 1/512 X 1/1024 X 1/2048 X 1/4096 X 1/8192 X

1/16,384 X Control

© Greg Kruger – University of Nebraska

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2X


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16X


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0

25

50

75

100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

% O

F C

HEC

K A

DJ

YIEL

D (

BU

/AC

)

____________________ R1 application _____________________________________________ V2 application ______________________

Trt Rate1 1.6 oz Clarity

2 0.16 oz Clarity

3 0.016 oz Clarity4 0.0016 oz Clarity

5 16 oz Weedar

6 1.6 oz Weedar

7 0.16 oz Weedar8 0.016 oz Weedar

9 Check

10 1.6 oz Clarity


13 0.0016 oz Clarity

14 16 oz Weedar


17 0.016 oz Weedar

18 Check


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0

25

50

75

100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

% O

F C

HEC

K A

DJ

YIEL

D (

BU

/AC

)


Trt Rate1 1.6 oz Clarity

2 0.16 oz Clarity


5 16 oz Weedar

6 1.6 oz Weedar


9 Check

10 1.6 oz Clarity


13 0.0016 oz Clarity

14 16 oz Weedar


17 0.016 oz Weedar

18 Check


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0

25

50

75

100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

% O

F C

HEC

K A

DJ

YIEL

D (

BU

/AC

)


Trt Rate1 1.6 oz Clarity2 0.16 oz Clarity

3 0.016 oz Clarity

4 0.0016 oz Clarity

5 16 oz Weedar6 1.6 oz Weedar

7 0.16 oz Weedar

8 0.016 oz Weedar

9 Check10 1.6 oz Clarity

11 0.16 oz Clarity

12 0.016 oz Clarity

13 0.0016 oz Clarity14 16 oz Weedar

15 1.6 oz Weedar

16 0.16 oz Weedar

17 0.016 oz Weedar18 Check


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99th percentile

50th percentile


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99th percentile

50th percentile


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99th percentile

50th percentile


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Plot size

Each plot was 50 feet long

20 foot dome was placed over soybean in the center of each plot

Three replications in each experiment

AR, GA, IN, LA, MS, NE

The Effect of Formulation on Dicamba Volatility When Applied Under Field Conditions – Debora de O. Latorre

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Each treatment was applied

to 3 flats (1.97 x 0.98 ft/

11.8 x 23.6”) of soil

Soil was treated at a remote

location and transported to

the test site


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Treated flats were placed between

two rows of soybeans in the center

of the dome, and plastic sheeting

was placed over the dome frame

Treated flats and plastic sheeting

were removed 48 hours after

application

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Xtendimax+ AMS

Engenia

Clarity

Xtendimax

Banvel

Roundup Xtend

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Xtendimax

TTI 11004

48”

Xtendima

x

XR

11004

24”

Xtendimax

TT11004

48”

Engenia

TTI 11004

24”

Xtendimax

TT11004

24”

Xtendimax

XR 11004

48”

Xtendima

x

TTI 11004

24”

800 VMD0.36% <141

800 VMD0.36% <141

800 VMD0.36% <141

442 VMD4.7% <141

442

VMD4.7%

<141

240 VMD19.5%

<141

240 VMD19.5%

<141

Droplet data with

water at 40 psi

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Xtendimax

TTI 11004

48”

Xtedimax

TT11004

48”

Engenia

TTI 11004

24”

Xtendimax

TT11004

24”

Xtendimax

XR 11004

48”

Xtendimax

TTI 11004

24”

Xtendimax

XR 11004

24”

Distance Xtendimax – XR 11004 - 48” Xtendimax – XR 11004 - 24” Xtedimax - TT11004 - 48” Xtendimax -TT11004 - 24” Xtendimax - TTI 11004 - 48” Xtendimax - TTI 11004 - 24” Engenia - TTI 11004 - 24”

6.56 ft 100 % 100 % 100 % 93.3 % 100 % 91.7 % 93.3 %

13.12 ft 100 % 84.7 % 100 % 75 % 97.7 % 66.7 % 68.3 %

19.68 ft 63.3 % 76.7 % 93.3 % 70.0 % 75.0 % 60.0 % 65.0 %

26.25 ft 86.7 % 70.0 % 78.3 % 65.0 % 68.3 % 53.3 % 61.7 %

32.80 ft 75.0 % 61.7 % 70.0 % 65.0 % 65 % 34.3 % 53.3 %

39.37 ft 71.7 % 60.0 % 61.7 % 60.0 % 63.3 % 45.1 % 41.7 %

45.93 ft 70.0 % 58.3 % 55.0 % 58.3 % 60.0 % 40.9 % 33.8 %

52.49 ft 43.3 % 69.2 % 69.2 % 53.3 % 53.3 % 41.7 % 61.7 %

59.05 ft 51.7 % 54.4 % 59.4 % 36.7 % 40.0 % 34.4 %

65.60 ft 62.5 % 57.5 % 62.5 % 30.8 % 44.2 %

82 ft 55.0 % 47.5 % 57.5 % 21.7 %

98.42 ft 62.5 % 46.3 % 50.0 %

114.83 ft 60.0 % 36.3 % 42.5 %

131.23 ft 57.5 % 30.0 %

147.64 ft 55.0 %

164.04 ft 25.0 %

180.45 ft 32.5 %

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Dicamba

5 GPA

14 DAA

Control 150 µm 300 µm

450 µm 600 µm 750 µm 900 µm

Dicamba Sprayed with Different Droplet Sizes

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Dicamba Alone – TTI11004 @ 40 PSI

10 GPA12 MPH

15 GPA8 MPH

20 GPA6 MPH

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Dicamba – TDXL-D11004 @ 40 PSI

10 GPA12 MPH

15 GPA8 MPH

20 GPA6 MPH

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10 GPA12 MPH

15 GPA8 MPH

20 GPA6 MPH

Dicamba + PMAX + SELECTMAX + WARRANT + Guar gumTTI11004 @ 40 PSI

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10 GPA12 MPH

15 GPA8 MPH

20 GPA6 MPH

XMAX + PMAX + SELECTMAX + WARRANT + Guar gumTDXL-D11004 @ 40 PSI

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VMD 634

DV10 302

DV50 634

DV90 972

PCT<150 1.06

% COVERAGE 9.59

VMD 634

DV10 302

DV50 634

DV90 972

PCT<150 1.06

% COVERAGE 13.75

TEEJET TTI1100460 PSI, 10 MPH, AT 15 GPA

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Questions?

Greg Kruger

Cropping Systems Specialist

West Central Research and Extension Center

North Platte, NE

Website: pat.unl.edu

[email protected]

(308)696-6715

Thank You!

mailto:[email protected]

Documents

2/19/2018 - wia.unl.edu WIA_Kruger.pdf · 2/19/2018 1 weedscience.unl.edu February 23, 2018 Greg Kruger 2018 Women In Agriculture Conference, Kearney, Nebraska Weed Science and Pesticide