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MepStar® is a foliar-applied systemic plant growth regulator that is used to manage the cotton plant for short-season production leading to improved quality for a more efficient harvest. MepStar® is a high-quality formulation that may produce larger bolls while reducing plant height for a tighter canopy. Additional benefi ts to using MepStar® include less trash and lower ginning costs, as well as improving harvest efficiency and producing a darker leaf color.

Functions: Plant Growth Regulator (PGR)

Chemical Family: Ammonium Compounds

Application Technique: Aerial Application, Ground Soil Applied, Sprayers

Technical Data Sheet
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Identification & Functionality

Chemical Family
Agrochemical Functions
Technologies
Composition

ACTIVE INGREDIENTS:

 Mepiguat Chloride: N,N-dimethylpiperidinium chloride - 4.2%

OTHER INGREDIENTS - 95.8%

MepStar® contains 0.35 Ib. active ingredient per gallon.

Features & Benefits

Agrochemicals Features
Product Features

• MepStar® should be used by the grower as an early or late season application through ground or aerial equipment.

• MepStar® off ers excellent compatibility with insecticides and miticides.

• Proven performance and results makes MepStar® the premier choice for cotton growers.

• Convenient packaging allows for easy handling, application and storage.

Product Information

ACTIVE INGREDIENT: Mepiquat Chloride

ACTIVE INGREDIENT PER GALLON: 0.35 lbs.

MODE OF ACTION: Inhibits the biosynthesis of gibberellic acid

PACKAGING: 4x1’s, 2x2.5’s and 265 gals.

Applications & Uses

Applicable Crop
Directions for use

GENERAL TANK MIXING INFORMATION

MepStar® is compatible with most insecticides and miticides. MepStar® may be combined with foliar fertilizers if prior experience has shown the original liquid formulation of MepStar® to be compatible and non-injurious under your conditions. Always perform a Compatibility Test for Mix Components before preparing a tank mix application. Read and follow the applicable Restrictions and Limitations and Directions for Use on all products involved in tank mixing. The most restrictive labeling applies to tank mixes.

GENERAL TANK MIXING INFORMATION

• Maximum seasonal use rate: Do not apply more than a total of 48 fluid ounces (3 pints) of MepStar® (0.132 pounds ai) per acre, per season.

• The sum of all products and formulations containing mepiquat chloride must not exceed 0.132 pounds of mepiquat chloride per acre per season.

• Preharvest Interval (PHI): Do not apply within 30 days of harvest.

• Do not plant another crop within 75 days of last treatment.

• Stress: Do not apply to cotton plants under severe stress. If using the low-rate multiple option, discontinue use until the stress is alleviated. Do not apply a single application of 8-16 fluid ounces of MepStar® to cotton that is stressed due to lack of soil moisture.

• Do not graze or feed cotton forage to livestock.

• Do not apply through any type of irrigation equipment.

RESTRICTIONS AND LIMITATIONS

Crop Preharvest Interval (PHI) Maximum Application Rate per Acre Maximum Rate per Acre per Season Livestock Grazing or Feeding Aircraft Application
Cotton 30 days 24 fluid ounces (1.5 pints) 48 fluid ounces (3 pints) NO YES

APPLICATION RATES AND TIMING:

LOW RATE MULTIPLE APPLICATIONS

AL, AR, AZ, CA, FL, GA, LA, MO, MS, NC, NM, OK, SC, TN, TX, VA
TIME OF APPLICATION Fields with Moderate Vegetative Vigor: Rate per Acre Fields with High Vegetative Vigor: Rate per Acre
FIRST APPLICATION: Optimal results will be achieved when plants are in the matchhead square* stage of growth. 2 fluid ounces 4 fluid ounces
SECOND APPLICATION: Apply 7–14 days later, or when regrowth occurs. 2 fluid ounces 4 fluid ounces
THIRD APPLICATION: Apply 7-14 days later, or when regrowth occurs. 2-4 fluid ounces** 4-8 fluid ounces**
FOURTH APPLICATION: Apply 7-14 days later, or when regrowth occurs 2-8 fluid ounces** 4-12 fluid ounces**
FIFTH APPLICATION (if needed): Apply 7-14 days later, or when regrowth occurs. 4-8 fluid ounces** 4-12 fluid ounces**
LATE SEASON: Refer to the “Late Season Application” section of the label. 8-16 fluid ounces** 12-24 fluid ounces**

*Matchhead square is when the first square of a typical cotton plant is 1/8–1/4 inches in diameter. The first application should be applied when 50% of the plants have one or more matchhead squares.

**Use the higher rates if previous application was not made or if growing conditions are conducive to vigorous growth.

APPLICATION RATES AND TIMING

AL, AR, AZ, CA, FL, GA, LA, MO, MS, NM, NC, SC, TN, VA
TIME OF APPLICATION RATE PER ACRE
FIRST APPLICATION: Apply MepStar® to actively growing cotton that is 20–30” tall, provided cotton is not more than 7 days beyond early bloom stage (5–6 blooms per 25 row feet). If cotton is 24” tall and has no blooms, apply MepStar®. Where excessive vegetative growth is not likely to be a problem, use 8–16 fluid ounces per acre. Use 16 fluid ounces per acre in areas tending to have excessive vegetative growth. 8-16 fluid ounces
SECOND APPLICATION FOR CONTROL OF EXCESSIVE VEGETATIVE GROWTH: Make a second application 2-3 weeks after the first application if the cotton field has a history of vigorous growth or if conditions after the first application of Mep Star™ favor vigorous growth. 8-16 fluid ounces
THIRD APPLICATION FOR CONTROL OF EXCESSIVE VEGETATIVE GROWTH: Make a third application 1–2 weeks after the first application if the cotton field has a history of vigorous growth or if conditions continue to favor vigorous growth. 8-16 fluid ounces
LATE SEASON APPLICATION: Refer to the Late Season Application section of the product label. 8-24 fluid ounces

 

OK, TX (except Rio Grande Valley)
TIME OF APPLICATION RATE PER ACRE
Areas where excessive vegetative growth is not a problem FIRST APPLICATION: Apply MepStar® in the early bloom stage (5–6 blooms per 25 row feet) to actively growing cotton. Apply MepStar® if no blooms are present and the cotton is 20” tall and actively growing. 8 fluid ounces
SECOND APPLICATION: Make a second application 2–3 weeks after the first application if conditions after the first application favor vigorous growth. 8 fluid ounces
THIRD APPLICATION: Make some third application 1–2 weeks after the second application if conditions after the second application continue to favor vigorous growth. 8 fluid ounces
LATE SEASON APPLICATION: Refer to the Late Season Application section of the product label. 8-24 fluid ounces

 

OK, TX (including Rio Grande Valley)
TIME OF APPLICATION RATE PER ACRE
Areas where excessive vegetative growth is not a problem FIRST APPLICATION: Apply MepStar® to actively growing cotton that is 20–30” tall, provided cotton is not more than 7 days beyond early bloom stage (5–6 blooms per 25 row feet). If cotton is 24” tall and has no blooms, apply Mep Star® 16 fluid ounces
SECOND APPLICATION FOR CONTROL OF EXCESSIVE VEGETATIVE GROWTH: Make a second application 2–3 weeks after the first application if cotton field has a history of vigorous growth, or conditions after the first application favor vigorous growth. 8-16 fluid ounces
THIRD APPLICATION: Make a third application 1–2 weeks after the second application if conditions after the second application continue to favor vigorous growth. 8-16 fluid ounces
LATE SEASON APPLICATION: Refer to the Late Season Application section of the product label. 8-24 fluid ounces

 

Directions for use

It is a violation of Federal law to use this product in a manner inconsistent with its labeling. Do not apply this product in a way that will contact workers or other persons, either directly or through drift. Only protected handlers may be in the area during application. For any requirements specific to your State or Tribe, consult the agency responsible for pesticide regulation.

Properties

Formulation Type
Physical Form

Safety & Health

Precautionary Statements

Do not apply directly to water, or to areas where surface water is present, or to intertidal areas below the mean high water mark. Do not contaminate water when cleaning equipment or disposing of equipment washwaters.

Personal Protective Eqiupment

Some materials that are chemical-resistant to this product are listed below. If you want more options, follow the instructions for Category A on an EPA chemical resistance category selection chart.

Applicators and other handlers must wear:

  • Long-sleeved shirt and long pants
  • Chemical-resistant gloves Category A, such as butyl rubber >= 14 mils, or natural rubber >= 14 mils, or neoprene rubber >= 14 mils or nitrile rubber >= 14 mils
  • Shoes plus socks

Follow manufacturer's instructions for cleaning/maintaining PPE. If no such instructions for washables, use detergent and hot water. Keep and wash PPE separately from other laundry.

User Safety Recommendations

Users should:

  • Wash hands before eating, drinking, chewing gum, using tobacco, or using the toilet.
  • Remove clothing immediately if pesticide gets inside. Then wash thoroughly and put on clean clothing.
  • Remove PPE immediately after handling this product. Wash the outside of gloves before removing. As soon as possible, wash thoroughly and change into clean clothing.

Packaging & Availability

Packaging Type

Storage & Handling

Storage and Disposal

Do not contaminate water, food, or feed by storage or disposal.

Pesticide Storage: Do not store below 32°F or above 100°F. Store in a dry place away from heat or open flame.

Pesticide Disposal: Wastes resulting from the use of this product may be disposed of on site or at an approved waste disposal facility.