Pac™ O™ is a plant growth regulator for use on commercially grown ornamental plants grown in containers in nurseries, greenhouses, etc.

Functions: Plant Growth Regulator (PGR)

Chemical Family: Triazoles

Application Technique: Ground Soil Applied, Sprayers

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Agrochemical Functions
Technologies
Composition
ACTIVE INGREDIENT:
Paclobutrazol ((±)-(R*,R*)-ß-[(4-Chlorophenyl)methyl)-α- (1,1-dimethylethyl)-IH-1,2,4-triazole-1-ethanol) 00.4%
OTHER INGREDIENTS 99.6%
TOTAL 100.0%

PAC O contains 0.12 g active ingredient per fluid ounce (4000 ppm).

Features & Benefits

Product Highlights

PAC O is a 0.4% formulation of the active ingredient paclobutrazol per gallon.

  • Common Name: Paclobutrazol
  • Class: Triazole

RESTRICTED ENTRY INTERVAL (REI) AND SIGNAL WORD

  • REI = 12 hours
  • Signal Word = CAUTION
General Plant Type

  RECOMMENDED TRIAL RATES (PPM) BY GENERAL PLANT TYPE

Plant Type Spray Drench Bulb Soak
Bedding Plants 30 1 N/A
Bedding Plant Plugs 5 1/4-1/2 Plug/Liner Soak
Flowering Foliage Plants 30-50 1-5 N/A
Herbaceous 30 1 N/A
Woody Species 50 2 N/A
Woody Landscape Plants 100 4 N/A
Bulb Crops 100 10 20 (@15min)

 

General Information
  • PAC O is a plant growth regulator for use on commercially grown ornamental plants grown in containers in nurseries, greenhouses etc.
  • PAC O reduces internode elongation, resulting in more desirable compact plants.
  • PAC O produces no phytotoxic effects when used as directed.
  • PAC O can be applied by spray, drench or bulb soak.
  • PAC O may be applied at any time of the day without risk of phytotoxic effects.
  • Under certain conditions, PAC O may be most effective when applied in sequential applications
  • Consistently agitate the spray/drenching solution of PAC O to ensure uniform distribution during application
  • PAC O does not require the addition of wetting agents.
  • PAC O is an extremely effective compound. DO NOT REUSE POTS, TRAYS, OR OTHER CONTAINERS THAT PREVIOUSLY HELD PLANTS OR SOIL TREATED WITH PAC O.
  • The efficacy of PAC O is affected by environmental and cultural conditions. Conditions causing vigorous growth require higher rates of PAC O to achieve the desired effect. Temperature is particularly important in this respect
  • Response to PAC O treatments varies with species and variety

Applications & Uses

Application Technique
Mode Of Action

PAC O reduces plant internodal length resulting in a shorter and more compact plant.

PAC O works by inhibiting gibberellic acid synthesis

Use Sites

PAC O may be used on commercially grown ornamental plants grown in containers in nurseries, greenhouses, etc.

Application Rates

PAC O label rates are dependent on the crop treated and the level of plant regulation desired: Rates range from 1 to 30 ppm Drench and 5 to 100 ppm Spray. 1 ppm = 1 milliliter/gallon; 5 ppm = 4.7 milliliter/gallon; 30 ppm = 1 fluid ounce per gallon. Refer to the product label for specific rates. For optimum effects, spray should be directed to plant stems. Application volume is 2 qt./100 sq. ft. or 218 gal. per acre. CAUTION: application run-off onto the soil will increase PAC O activity. Drench rates compared to spray rates are about a 1:10 factor, that is, 1 ppm drench should be similar to 10 ppm sprayed. PAC O can be applied as a liner dip, drench or spray, and maybe used through subirrigation, or as a bulb soak. The addition of wetting agents is not necessary. PAC O is not affected by overhead irrigation provided the user waits 30 minutes after PAC O application.

Tank Mixing

PAC O or other plant growth regulators are not recommended to be tank mixed with pesticides due to application volume differences. Tank mixes with other PGRs are allowed and may be an effective way to increase overall plant growth control. Growers should trial a small number of plants before committing to any tank mix program(s). Evaluate growth responses for 4-8 weeks after applications.

Crops

SPECIFIC PAC O CROP RECOMMENDATION EXAMPLES

    PAC O Plug Soak PAC O Spray PAC O Drench Comment
Bedding Plants Petunias 4 to 8 PPM Soak 30 seconds 30 to 50 PPM 2 to 5 PPM Apply after 1 week transplant
  Impatiens 1/2 to 1 PPM Soak 30 seconds 15 PPM 1/2 PPM* * Stage 3 germination.
  Dianthus 1 to 2 PPM  20 PPM 1/4 to 1/2 PPM Apply a second spray at 1/2 rate if needed.
  Calibrachoa 4 PPM 15 to 20 PPM 2 PPM Plug soak is very effective.
  Kale 3 to 4 PPM   1 to 2 PPM* * Apply at 3 leaf stage.
Flowering Plants Chrysanthemums   30 to 50 PPM** 1 to 2 PPM ** Apply to 1/2 to 1 inch long shoots
  Poinsettia   15 to 30 PPM 1/2 to 1 PPM** ** November late drench
    1 /10 PPM*** *** Low dose early drench apply as needed.
Perennials Echinacea 2 to 4 PPM Soak 30 seconds 30 to 60 PPM** 4 to 6 PPM * Use half rate for second application if needed.
  Argyranthemum 4 PPM 30 PPM 3 to 4 PPM Plug soak is very effective.
  Salvia leucantha   30 to 60 PPM**   ** Apply second spray as needed.
Woody Plants Azalea   100 to 150 PPM 10 to 15 PPM i ncreased bloom response.
  Gardenia   100 to 150 PPM 15 PPM Good color response.
Bulbs Lilium oriental Casa Blanca 80 PPM Bulb soak for one minute 10 to 20 PPM   For height control.
  Lilium and other orientals 200 to 300 PPM     Variable rooting makes drench results variable.
  Lilium Asiatic   15 PPM* 20 PPM * Apply multiple sprays 2 weeks apart as needed.
  Calla Lily 20 PPM bulb soak*   10 PPM * Soak 15 minutes

 

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 person, 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. Read all label directions carefully before use.

Agricultural Use Requirements

Use this product only in accordance with its labeling and with the Worker Protection Standard, 40 CFR Part 170. This Standard contains requirements for the protection of agricultural workers on farms, forests, nurseries, and greenhouses, and handlers of agricultural pesticides. It contains requirements for training, decontamination, notification, and emergency assistance. It also contains specific instructions and exceptions pertaining to the statements on this label about personal protective equipment (PPE), and restricted entry interval. The requirements in this box only apply to uses of this product that are covered by the Worker Protection Standard. Do not enter or allow worker entry into treated areas during the restricted entry interval (REI) of 12 hours.

PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involves contact with anything that has been treated, such as plants, soil, or water, is:

  • Long-sleeved shirt and long pants
  • Chemical-resistant gloves made of any waterproof material, such as Barrier Laminate, Butyl Rubber, Nitrile Rubber, Neoprene Rubber, Polyvinyl Chloride, or Viton
  • Shoes plus socks

Safety & Health

Personal Protective Equipment (Ppe)
  • Long-sleeved shirt and long pants
  • Chemical-resistant gloves made of any waterproof material, such as Barrier Laminate, Butyl Rubber, Nitrile Rubber, Neoprene Rubber, Polyvinyl Chloride, or Viton
  • Shoes plus socks

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

Precautionary Statements

HAZARDS TO HUMANS AND DOMESTIC ANIMALS

CAUTION. Harmful if absorbed through skin. Avoid contact with skin or clothing. IMPORTANT: Read the entire directions for use and the conditions of sale and warranty before using this product.

User Safety Recommendations
  • 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
Environmental Hazards

Do not contaminate water when disposing of equipment washwaters

Packaging & Availability

Packaging Type
Packaging
  • 1 gallon, 4 per case

Storage & Handling

Storage And Disposal

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

STORAGE: Keep container closed when not in use.

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

CONTAINER DISPOSAL: Nonrefillable container. Do not reuse or refill this container. Triple rinse as follows: Empty the remaining contents into application equipment or a mix tank and drain for 10 seconds after the flow begins to drip. Fill the container ¼ full with water and recap. Shake for 10 seconds. Pour rinsate into application equipment or a mix tank or store rinsate for later use or disposal. Drain for 10 seconds after the flow begins to drip. Repeat this procedure two more times. Then offer for recycling or reconditioning, or puncture and dispose of in a sanitary landfill, by incineration, or if allowed by state and local authorities, by burning. If burned, stay out of smoke.