Kansas State University

         Fall application of concentrate products for dandelion control.

 

Trial ID: 01-19             Investigator: Matt Fagerness

Location: Rocky Ford          Study Dir.: Matt Fagerness

 

                                          

Reps: 4                                Plots: 5 by 5 feet

Spray Vol: 30 gal/ac                   Mix Size: 1 liters (min .2607)

Trt

Treatment

Form

Fm

 

Rate

Grow

Appl

Amt Product

Plot No. By Rep

 

No.

Name

Amt

Ds

Rate

Unit

Stg

Code

to Measure

 1

 2

 3

 4

 

1

Nontreated

 

 

 

 

 

 

 

  101

  204

  303

  404

2

All-in-One Conc.

 

EW

3

FL OZ/1000 FT2

 

A

34.03 ml/mx

  102

  201

  304

  402

3

Ortho WeedBGon Conc.

 

EW

5

FL OZ/1000 FT2

 

A

56.72 ml/mx

  103

  202

  301

  403

4

Spectracide Weedstop

 

EW

4

FL OZ/1000 FT2

 

A

45.38 ml/mx

  104

  203

  302

  401
                             

 

Weed Code

TAROF

TAROF

TAROF

TAROF

TAROF

Crop Code

FESAR

FESAR

FESAR

FESAR

FESAR

Rating Data Type

%control

%control

%control

%control

%control

Rating Unit

2DAT

9DAT

14DAT

21DAT

28DAT

Rating Date

Sep-13-01

Sep-20-01

Sep-25-01

Oct-04-01

Oct-12-01

Trt-Eval Interval

2 DA-A

9 DA-A

14 DA-A

23 DA-A

31 DA-A

Trt

Treatment

 

Rate

 

 

 

 

 

No.

Name

Rate

Unit

 

 

 

 

 

 

 

 

 

 

1

Nontreated

 

 

5.0

b

6.3

b

0.0

c

0.0

c

0.0

c

2

All-in-One Conc.

3

FL OZ/1000 FT2

12.5

ab

21.3

b

43.8

b

60.0

b

77.5

b

3

Ortho WeedBGon Conc.

5

FL OZ/1000 FT2

23.8

a

53.8

a

65.0

a

85.0

a

88.8

a

4

Spectracide Weedstop

4

FL OZ/1000 FT2

22.5

a

51.3

a

55.0

ab

82.5

a

87.5

a

LSD (P=.05)

11.17

18.03

13.21

7.42

6.83

Standard Deviation

6.98

11.27

8.26

4.64

4.27

CV

43.82

34.03

20.18

8.16

6.73

Bartlett's X2

0.549

1.152

3.595

2.029

0.308

P(Bartlett's X2)

0.908

0.765

0.166

0.363

0.857

 

 

 

 

 

 

Replicate F

0.886

2.705

1.244

3.581

2.829

Replicate Prob(F)

0.4844

0.1080

0.3499

0.0597

0.0989

Treatment F

6.438

16.967

48.084

290.613

398.029

Treatment Prob(F)

0.0128

0.0005

0.0001

0.0001

0.0001

 

Means followed by same letter do not significantly differ (P=.05, Student-Newman-Keuls)

 

 

Trial Comments

 

Treatments for the fall version of this experiment only featured the concentrates from the original protocol, as they

featured the rate discrepancy that compromised the original results. All spray application specifications were as

detailed in the spring version of the experiment already reported on. Results were more as expected in this

experiment as all herbicides effectively controlled dandelion. Good uniform populations of this weed were evident

prior to initiating the study. While the All-in-One product showed reduced control compared to the other

concentrates, the rate differential among the products specified in the protocol may have been partially

accountable as the All-in-One material contains considerably less phenoxy herbicide than the others. Properly

accounting for these concentration differences effectively levels the playing field for efficacy comparison.