Evaluations of Stance® Plant Growth Regulator on Deltapine® Brand Cotton Varieties

February 25, 2025

Click on a tab below to see data collected each year for this study

TRIAL OBJECTIVE

The use of a plant growth regulator (PGR) can help optimize cotton varietal potential. PGR use is highly dynamic and must be customized for each growth case during a season.
Stance^® Plant Growth Regulator is a Bayer Crop Science product containing the active ingredients mepiquat chloride and cyclanilide, which offers a growth control option for cotton growers. This combination typically offers crop safety when used early at lower rates and powerful growth control in late-season situations where more powerful control is needed.
The objective of this trial was to help answer questions about the best way to use Stance^® Plant Growth Regulator with Deltapine^® brand cotton varieties. The questions include whether to use the PGR early at low rates, later with higher rates, or at both times.

RESEARCH SITE DETAILS

Plant growth regulator application dates
- July 6
- July 30
- August 22
Plant growth regulator products applied
- Stance^® Plant Growth Regulator
- Generic 4.2% mepiquat chloride
Application regimens
- Untreated Check (UTC) – No PGR Applied
- Regimen 1
  - 7/6/2024 – 2 fl oz/acre of Stance^® Plant Growth Regulator
  - 7/30/2024 – 16 fl oz/acre of 4.2% mepiquat chloride
  - 8/22/2024 – 16 fl oz/acre of 4.2% mepiquat chloride
- Regimen 2
  - 7/6/2024 – 2 fl oz/acre of Stance^® Plant Growth Regulator
  - 7/30/2024 – 3 fl oz/acre of Stance^® Plant Growth Regulator
  - 8/22/2024 – 4 fl oz/acre of Stance^® Plant Growth Regulator
- Regimen 3
  - 7/6/2024 – 16 fl oz/acre 4.2% mepiquat chloride
  - 7/30/2024 – 16 fl oz/acre 4.2% mepiquat chloride
  - 8/22/2024 – 16 fl oz/acre 4.2% mepiquat chloride
- Regimen 4
  - 7/6/2024 – 16 fl oz/acre 4.2% mepiquat chloride
  - 7/30/2024 – 16 fl oz/acre 4.2% mepiquat chloride
  - 8/22/2024 – 3 fl oz/acre of Stance^® Plant Growth Regulator
All field work, tillage, and herbicides were per local standards.
Single-replication strip-plot with each regimen consisting of 12 rows which were each 1,000 feet long (about 1.0 acre/regimen).
Center 6 rows were machine harvested for yield estimation (about 0.4 acre/regimen).
- Data on field observations for growth characteristics/management decisions during the season were collected as follows:
  - Plant heights not taken due to time limitations during the late season but typical responses were observed.
  - Representative site turnouts (from Heaven Cut Variety Evaluations) used to estimate lint yields.
Deltapine^® brand cotton varieties planted are listed in Table 1.

Table 1. Deltapine^® Brand Varieties Planted in Trial.

Additional plot information:
- This location would be characterized as a difficult early season environment followed by adequate growth conditions during the mid and late season.
- Growth rates/observations were indicative of conditions where lower intensity growth control options would typically be used early season, followed by increasing rates/intensity during the mid/late season.

UNDERSTANDING THE RESULTS

The highest lint yields and moderate growth control responses were recorded in the treatments applying Stance^® Plant Growth Regulator at 2 fl oz/acre on July 6 followed by 16 fl oz/acre rates of 4.2% mepiquat chloride applications on July 30 and August 22 (Figure 1, Regimen 1). This would be expected in a growth environment where plant development was slow and/or delayed by early season conditions.
Varietal background has an influence on potential PGR response:
- Deltapine^® brand DP 2211 B3TXF and Deltapine^® brand DP 2317 B3TXF—which have the most determinate genetics—were lower yielding in the most aggressive treatment combination (Figure 2, Regimen 4).
- Deltapine^® brand DP 2127 B3XF, Deltapine^® brand DP 2333 B3XF, and Deltapine^® brand DP 2328 B3TXF—which are more indeterminate varieties—were not severely affected by the aggressive treatments (Figure 2, Regimen 4). Their corresponding yields were marginally improved by more aggressive treatments.
- Figure 3 shows individual product performance by treatment.

Figure 1. Average lint yield for plant growth regulator applications at the Bayer Crop Science Learning Center at Scott, MS in 2024.

Figure 2. Plant growth regulator system lint yield by Deltapine® brand cotton variety at the Bayer Crop Science Learning Center at Scott, MS in 2024.

Figure 3. Deltapine® brand cotton variety lint yield by plant growth regulator regimens at the Bayer Crop Science Learning Center at Scott, MS in 2024.

KEY LEARNINGS

Stance^® Plant Growth Regulator offers an option for PGR use in difficult early season growth conditions, allowing growers to use a PGR to react to the crop as it develops.
This data represents one environment, year, and location with several varieties included as examples. In other conditions, recommendations and product usage would likely shift in several ways.
Please contact your Bayer or Deltapine^® brand representative for more information.

No dicamba may be used in-crop with seed with Roundup Ready^® Xtend Technology, unless and until approved or specifically permitted, and no dicamba formulations are currently registered for such use in the 2025 season. Please follow www.roundupreadyxtend.com/pages/xtendimax-updates.aspx for status updates. Dicamba may harm crops that are not tolerant to dicamba.

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