NC State University|Crop Science|College of Agriculture and Life Science|NC Cooperative Extension
Keith Edmisten, Cotton Extension Specialist
Department of Crop Science
North Carolina State University

There have been some questions about the new growth regulator, Stance. Stance is mepiquat chloride with cyclanalid. Stance contains 0.736 lb/gal mepiquat chloride and 0.184 lb/gal of cyclanilide. Cyclananlid is the same thing that is added to Finish to make ethephon more active or more readily taken up by the plant. Stance is recommended to be applied at 2 to 3 ounces because it contains more mepiquat than other formulations and due to the dual mode of action. Most research has involved the use of Stance in a low-rate multiple application strategy or a modified early bloom strategy. It appeared to work well in our plots although there was not a lot of excessive growth.

One thing that is concerning for us is that we are having to play catch up on vigorously growing cotton in many cases this year, especially where rains have kept us from applying growth regulators as early as we would have liked. If you are looking at cotton you think needs 16 or 20 ounces of regular mepiquat will 3 ounces of Stance do the same thing? We don’t know and are concerned it may not. Data from Virginia suggests that 3 ounces of Stance will not “play catch up” like 16 ounces of standard mepiquat (Table 2). Hopefully we will get some experience this year to determine how Stance might be used in this situation.

Limited research with Stance suggests that there is of less rate response than with other mepiquat formulations. The rate response with Stance is not yet clear. It will take more experience to determine what rate of Stance is equivalent to a given rate of mepiquat in a given situation. In tables 1 and 2 below you can see how Stance compared to standard mepiquat chloride applications in 2005.

Table 1. Stance trial in Virginia in 2005 conducted by Joel Fairchloth.
trt
Treatment Name
From Conc
From type
Rate
Rate Unit
Growth Stage
Plant Height
LINT YIELD
inches 18 Jul-05 3 DA-C
inches 15-Aug-05
LB/A 21-Oct-05

1
Untreated
   
 
35.3
45.25
1586.85
2
Mepex
0.35
 SL 4
OZ/A
MTCH SQ
28.6

30.7125
1524.412
2
Mepex
0.35
 SL 4
OZ/A
7-14 DAT
2
Mepex
0.35
 SL 8
OZ/A
EBLM
3
Stance
10.5
 SC 1.5
OZ/A
MTCH SQ
26.4
30.4125
1508.658
3
Stance
10.5
 SC 1.5
OZ/A
7-14 DAT
3
Stance
10.5
 SC 1.5
OZ/A
EBLM
4
Mepex
0.35
 SL 8
OZ/A
MTCH SQ
26.1
30.5
1519.752
4
Mepex
0.35
 SL 8
OZ/A
7-14 DAT
4
Mepex
0.35
 SL 16
OZ/A
EBLM
5
Stance
10.5
 SC 2
OZ/A
MTCH SQ
28.5
31.2375
1445.821
5
Stance
10.5
 SC 2
OZ/A
7-14 DAT
5
Stance
10.5
 SC 2
OZ/A
EBLM
6
Stance
10.5
 SC 1.5
OZ/A
MTCH SQ
26.9
23.1875
1412.846
6
Stance
10.5
 SC 2
OZ/A
7-14 DAT
6
Stance
10.5
 SC 2
OZ/A
EBLM
7
Stance
10.5
 SC 1.5
OZ/A
MTCH SQ
26.8
29.7875
1465.972
7
Stance
10.5
 SC 2.5
OZ/A
7-14 DAT
7
Stance
10.5
 SC 2.5
OZ/A
EBLM
8
Mepex
0.35
 SL 16
OZ/A
EBLM
34.5
37
1571.367
9
Stance
10.5
 SC 3
OZ/A
EBLM
35.2
41.2125
1685.348
10
Stance
10.5
 SC 2
OZ/A
MTCH SQ
30.3
33.7375
1475.545
10
Stance
10.5
 SC 3
OZ/A
EBLM
11
Stance
10.5
 SC 2.5
OZ/A
EBLM
35.7
41.1
1762.301
11
Stance
10.5
 SC 10.5
OZ/A
NAWF 5
12
Mepex
0.35
 SL 16
OZ/A
EBLM
35.1
39.3125
1510.354
12
Stance
10.5
 SC 3
OZ/A
NAWF 5
      
                   

 

Table 2. Stance trial in North Carolina 2005.
No. Name     Height (cm) Nodes % Ginout % Lint/acre    
1 Untreated 73.96 ab 14.59 a 0.43 a 1187.25 a    
2 Pix 4 fl oz/a
MHS
 56.92 d 12.71 de 0.43 ab 1232.47 a    
Pix 4 fl oz/a
2 WAT
   
Pix 8 fl oz/a
EB
    
3 Stance 1.5 fl oz/a
MHS
 62.17 cd 13.13 b-e 0.43 a-d 1146.24 a    
Stance 1.5 fl oz/a
2 WAT
    
Stance 1.5 fl oz/a
EB
    
4 Pix 8 fl oz/a
MHS
 57.13 d 12.29 e 0.41 e 1148.11 a    
Pix 8 fl oz/a
2 WAT
    
Pix 16 fl oz/a
EB
    
5 Stance 2 fl oz/a
MHS
 63.46 cd 13.42 bcd 0.42 de 1166.35 a    
Stance 2 fl oz/a
2 WAT
    
Stance 2 fl oz/a
EB
    
6 Stance 1.5 fl oz/a
MHS
 64.42 cd 12.58 cde 0.42 cde 1166.04 a    
Stance 2 fl oz/a
2 WAT
    
Stance 2 fl oz/a
EB
    
7 Stance 1.5 fl oz/a
MHS
 68.34 bc 12.83 cde 0.42 b-e 1312.43 a    
Stance 2 fl oz/a
2 WAT
    
Stance 2 fl oz/a
EB
    
8 Stance 2 fl oz/a
MHS
 65.13 cd 12.63 de 0.42 cde 1213.14 a    
Stance 3 fl oz/a
EB
    
9 Pix 16 fl oz/a
EB
 76.5 ab 13.92 ab 0.43 a 1239.15 a    
10 Stance 3 fl oz/a
EB
 77.38 a 13.5 bcd 0.43 abc 1343.95 a    
11 Pix 16 fl oz/a
EB
 80.5 a 13.88 abc 0.43 abc 1345.43 a    
Stance 3 fl oz/a
Cutout
    
12 Stance 2.5 fl oz/a
EB
 77.83 a 13.88 abc 0.43 ab 1207.22 a    
Stance 3 fl oz/a
Cutout
    
   
LSD (P=.05) 8.802 1.077 0.012 234.925    
Standard Deviation 6.096 0.746 0.008 162.702    
CV 8.88 5.62 1.99 13.27    
                   
                   
                   
                   
                   
                   
                   
                   

2006 - Carolina Cotton Notes

NCSU Cotton Team

2006 crop science©
last modified June 30, 2006 3:50 PM
page by Gary Little