Primo 250EC Turf Growth Regulator

Primo 250EC Turf Growth Regulator is an economical solution for optimising turf health and reducing mowing effort. This trusted product improves turf quality by enhancing density, colour, and stress tolerance, while also increasing water and nutrient efficiency.

It’s ideal for large areas, offering proactive turf management for a beautiful, low-maintenance lawn, and can be used on a wide range of warm- and cool-season turfgrasses.

Active Ingredient: Trinexapac-Ethyl @ 250g/L

Similar or comparable to Astro 250EC Growth Regulator (Turf Culture)

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Description

Primo 250EC Turf Growth Regulator

Active Ingredient: Trinexapac-Ethyl @ 250g/L

Similar or comparable to Astro 250EC Growth Regulator (Turf Culture)

Primo 250EC Turf Growth Regulator is for the reduction of leaf and stem growth of grass species, as an aid in turf management and as an aid in Winter Grass management. Primo 250EC Turf Growth Regulator is used to regulate turf growth and improve the quality of larger areas, economically.

Primo 250EC Turf Growth Regulator is the original, trusted and economical turf growth regulator for large areas that optimises the mowing effort and improves turf quality. Primo 250EC offers a proactive approach to turf management. Instead of simply reacting to issues as they arise, it fundamentally improves the health and resilience of the turf from the inside out, leading to a beautiful, low-maintenance lawn that is better equipped to thrive in a variety of conditions.

Why choose Primo 250EC Turf Growth Regulator?

Overall improvement of turf quality and colour.
An effective growth and cost management tool through savings from reduced mowing time, clippings disposal and less machinery wear.
A versatile option for use on turf farms, bunker edges, roadsides and challenging to manage areas.
Trusted EC formulation matches the uptake limits in turf to avoid phytotoxicity.
Reduced mowing frequency (up to 50%).
Improved turf density and vigour. Increased density not only creates a more lush and uniform appearance but also enhances the turf’s ability to outcompete weeds and withstand foot traffic.
Enhanced colour and aesthetics (the concentration of chlorophyll in the shorter, more compact leaf blades results in a deeper, richer green hue).
Increased stress tolerance due to a more robust root system and denser canopy.
Better water and nutrient use efficiency (An extensive root system allows the turf to effectively absorb water and nutrients from the soil, leading to a more efficient use of vital resources.).
Improved playing surfaces (denser and more uniform growth creates a superior playing surface).
Backed by the proven reliability of Syngenta Turf

What turf species can Primo 250EC Turf Growth Regulator be used on?

Warm-Season Turf Grasses
- Bahia Grass
- Buffalo Grass
- Carpet Grass
- Common Couch
- Couch hybrids and varieties
- Kikuyu
- Queensland Blue Couch
- Zoysia
Cool-Season Turf Grasses
- Bent Grass
- Fescue
- Perennial Ryegrass

Primo 250EC Turf Growth Regulator can be continuously and safely used for up to 12 months of the year, as long as active turf growth occurs. Tracking the growth rate of the turf with the rate of Primo 250EC applied is essential to manage a consistent regulation effect for the entire application period.

Primo 250EC Turf Growth Regulator is an emulsion concentrate (EC) with minimal odour. It mixes completely with water and may be tank mixed with many commonly used fungicides and liquid fertilisers. Physical compatibility of mixtures is not a guarantee that a tank mix will be safe to turf (eg Primo 250EC is compatible with broadleaf herbicides containing MCPA, 2,4-D amine or dicamba, but the tank mix can cause transient yellowing after application).

Primo 250EC Turf Growth Regulator contains Trinexapac-Ethyl. Turf growth regulators formulated with Trinexapac-Ethyl have become a cornerstone of modern turf management, renowned for their ability to produce healthier, more resilient, and aesthetically pleasing lawns with significantly less maintenance. Their effectiveness lies in a clever manipulation of the grass’s natural growth processes, leading to a cascade of benefits that both homeowners and professional turf managers find highly desirable.

At its core, Trinexapac-Ethyl works by inhibiting the production of gibberellic acid, a plant hormone responsible for cell elongation in the stems and leaves of grass. By blocking the final stage of this hormone’s biosynthesis, the regulator doesn’t stop growth altogether but rather redirects the plant’s energy. Instead of expending resources on vertical shoot growth, the grass focuses on developing a denser, more robust root system and increasing its lateral spread

Pack Size: 5-Litre

Registrant: Syngenta Australia Pty Ltd (APVMA #: 46008)

Turf and Domestic Growth Regulators

Features & Benefits

Overall improvement of turf quality and colour.
An effective growth and cost management tool through savings from reduced mowing time, clippings disposal and less machinery wear.
A versatile option for use on turf farms, bunker edges, roadsides and challenging to manage areas.
Trusted EC formulation matches the uptake limits in turf to avoid phytotoxicity.
Reduced mowing frequency (up to 50%).
Improved turf density and vigour. Increased density not only creates a more lush and uniform appearance but also enhances the turf’s ability to outcompete weeds and withstand foot traffic.
Enhanced colour and aesthetics (the concentration of chlorophyll in the shorter, more compact leaf blades results in a deeper, richer green hue).
Increased stress tolerance due to a more robust root system and denser canopy.
Better water and nutrient use efficiency (An extensive root system allows the turf to effectively absorb water and nutrients from the soil, leading to a more efficient use of vital resources.).
Improved playing surfaces (denser and more uniform growth creates a superior playing surface).
Backed by the proven reliability of Syngenta Turf

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Directions Of Use

For Primo 250EC Turf Growth Regulator directions for use, click here.

Turf Growth Management:

Situation: Golf Course Greens
Grass: Bent Grass
Rate:
- Low Volume Spray/Ha: 500mL – 1L
- Knapsack application/m²: 5mL – 10mL
Critical Comments:
- Apply Primo 250EC at least 6 hours before or after mowing and when turf is actively growing.
- Use the lower rates on turf with moderate growth rates where a lower level of growth reduction is required, or when used in a program.
- Apply rates towards the higher end of the rate range when growth is vigorous or when longer periods of up to 6 weeks of suppression are required.
- Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration.
- Well-maintained lawns and turf surfaces are those that receive at least weekly mowing, and good levels of water and fertility are maintained.

Situation: Golf Course Fairways
Grasses: Common Couch
Rate:
- Low Volume Spray/Ha: 400mL – 800mL
- Knapsack application/m²: 4mL – 8mL
Grasses: Couch varieties (Greenlees Park, Wintergreen & Santa Ana)
Rate:
- Low Volume Spray/Ha: 300mL – 600mL
- Knapsack application/m²: 3mL – 6mL
Grasses: Fescue, Perennial Ryegrass
Rate:
- Low Volume Spray/Ha: 800mL – 1.5L
- Knapsack application/m²: 8mL – 15mL
Grasses: Kikuyu & Carpet Grass
Rate:
- Low Volume Spray/Ha: 800mL – 2L
- Knapsack application/m²: 8mL – 20mL
Critical Comments:
- Apply Primo 250EC at least 6 hours before or after mowing and when turf is actively growing.
- Use the lower rates on turf with moderate growth rates where a lower level of growth reduction is required, or when used in a program.
- Apply rates towards the higher end of the rate range when growth is vigorous or when longer periods of up to 6 weeks of suppression are required.
- Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration.
- Well-maintained lawns and turf surfaces are those that receive at least weekly mowing, and good levels of water and fertility are maintained.

Situation: Golf course short roughs, well-maintained lawns and turf surfaces.
Grasses: Buffalo Grass, Common Couch and Hybrid Couch
Rate:
- Low Volume Spray/Ha: 500mL to 1L
- Knapsack application/m²: 5mL – 10mL
Grass: Kikuyu
Rate:
- Low Volume Spray/Ha: 800mL to 8L
- Knapsack application/m²: 8mL – 30mL
Critical Comments:
- Apply Primo 250EC at least 6 hours before or after mowing and when turf is actively growing.
- Use the lower rates on turf with moderate growth rates where a lower level of growth reduction is required, or when used in a program.
- Apply rates towards the higher end of the rate range when growth is vigorous or when longer periods of up to 6 weeks of suppression are required.
- Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration.
- Well-maintained lawns and turf surfaces are those that receive at least weekly mowing, and good levels of water and fertility are maintained.

Situation: Golf course long roughs, parks, ovals, lawns, and general grassed areas
Grasses: Buffalo Grass, Common Couch and Hybrid Couch
Rate:
- Low Volume Spray/Ha: 500mL to 2L
- Knapsack application/m²: 5mL – 20mL
Grasses: Fescue, Perennial Ryegrass and Bent Grass
Rate:
- Low Volume Spray/Ha: 1L to 3L
- Knapsack application/m²: 10mL – 30mL
Grass: Kikuyu
Rate:
- Low Volume Spray/Ha: 1L to 4L
- Knapsack application/m²: 10mL – 400mL
Critical Comments:
- Apply Primo 250EC at least 6 hours before or after mowing and when turf is actively growing.
- Use the lower rates on turf with moderate growth rates where a lower level of growth reduction is required, or when used in a program.
- Apply rates towards the higher end of the rate range when growth is vigorous or when longer periods of up to 6 weeks of suppression are required.
- Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration.
- Well-maintained lawns and turf surfaces are those that receive at least weekly mowing, and good levels of water and fertility are maintained.

Situation: Bunker facing, path and garden edging, footpath and curbside edging, fencelines and around trees
Grasses: Buffalo Grass, Couch varieties: Greenlees Park, Wintergreen, Santa Ana
Rate:
- Low Volume Spray/Ha: 2L
- Knapsack application/m²: 20mL
Grasses: Common Couch, Perennial Ryegrass and Bent Grass
Rate:
- Low Volume Spray/Ha: 2L – 3L
- Knapsack application/m²: 20mL – 30mL
Grass: Kikuyu
Rate:
- Low Volume Spray/Ha: 3L to 4L
- Knapsack application/m²: 30mL – 400mL
Critical Comments:
- Apply Primo 250EC at least 6 hours before or after mowing and when turf is actively growing.
- In difficult-to-mow areas, apply Primo 250EC to actively growing turf and mow 3 to 4 days after application.
- Apply in a strip approximately 25 to 50 cm wide.
- Use the lower rates of Primo 250EC around bunker edges and the higher rates in the other situations.
- Application made to turf growing under cool conditions or to turf with low nutrient levels or where growth rates are low may result in discolouration.

Winter Grass (Poa Annua) Management:

Situation: Golf course fairways, Golf course greens
Grass: Poa Annua
Rate:
- Low Volume Spray/Ha: 200mL – 500mL
- Knapsack application/m²: 2mL – 5mL
Critical Comments:
- See instructions under Poa annua Management for the reduction of Poa annua swards in Bent Grass golf greens.
- See the Golf course greens section in the directions for use for application recommendations.

Bahia Grass (Paspalum notatum) Suppression and Seedhead Control:

Situation: Common Couch, Durban Grass, Hybrid Couch, Qld Blue Couch, Zoysia only in golf course long roughs, lawns, median strips, ovals, parks, roadsides, general grassed areas
Grass: Bahia Grass (Paspalum notatum) suppression and seedhead control
Rate:
- Low Volume Spray/Ha: 1L to 2 L plus 75 mL/ha Monument Liquid Turf Herbicide plus a quality nonionic surfactant at 0.25% v/v (1000 g ai/L products) or 0.42% v/v (600 g ai/L products such as Agral® Spray Adjuvant)
- Knapsack application/m²: 10mL to 2mL plus 75 mL/ha Monument Liquid Turf Herbicide plus a quality nonionic surfactant at 0.25% v/v (1000 g ai/L products) or 0.42% v/v (600 g ai/L products such as Agral® Spray Adjuvant)
Critical Comments:
- Apply during the summer when Bahia Grass produces seedheads.
- Do not apply more than two consecutive applications of Monument Liquid per season.
- See instructions under Bahia Grass (Paspalum notatum) Management for control of Bahia Grass seedheads in established couch areas.
- Refer to the Mixing and Application sections for detailed information.
- Important: Refer to the Monument Liquid label for specific directions on mixing, avoiding spray drift, sprayer cleanup and protection of non-target crops and the environment.

Rates are a general guide only. Before opening, carefully read Primo 250EC Turf Growth Regulator directions for use, precautionary and protection statements, storage and disposal, safety directions and first aid instructions. The product is designed for the particular purpose indicated on the label. Failure to use the product strictly as directed may be illegal and dangerous, and render the product ineffective.

Questions and answers from customers

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Disclaimer: This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Host & Pest

Host	Pest
Host & Pest
Around Established Trees, Bunker Facing, Fenceline Weed Control, Footpath And Curbside Edging & Path And Garden Edging	Bent Grass - Agrostis Spp., Buffalo Grass, Common Couch, Couch - Greenlees Park, Couch - Santa Ana, Couch - Wintergreen, Kikuyu Grass, Perennial Ryegrass
Common Couch Lawn Or Turf, Durban Grass, Hybrid Couch Grass Turf, Queensland Blue Couch & Zoysia Grass Turf	Bahia Grass
Golf Course - Long Rough, Golf Course - Short Rough, Grass For Turf Or Lawn, Lawn, Lawns & Turf Surfaces - Well Maintained And Oval Or Park Turf Or Lawn	Bent Grass - Agrostis Spp., Buffalo Grass, Common Couch, Fescue, Hybrid Couch, Kikuyu Grass, Perennial Ryegrass
Golf Fairway	Carpet Grass, Common Couch, Couch - Greenlees Park, Couch - Santa Ana, Couch - Wintergreen, Fescue, Kikuyu Grass, Perennial Ryegrass, Winter Grass
Golf Green Of Bent Grass	Winter Grass
Golf Green Turf	Bent Grass - Agrostis Spp.

Tips For Use

General Instructions:

Primo 250EC should be applied to actively growing turf at least 6 hours before or after mowing.
Good mowing management leading up to application is required to achieve a good quality turf surface and to obtain the best results from Primo 250EC.

Growth Regulation:

The recommended use rates are designed to give approximately a 50% reduction in clippings over a 4 to 6-week period.
In practice, the amount of growth regulation achieved will vary between situations due to environmental conditions and management practices.
To some extent, therefore, application rates will need to be adjusted to match growing conditions, management practices and the amount of growth regulation required by the turf manager.
Repeat applications can be made as soon as turf resumes growth or more suppression is required.

Poa annua Management:

Different grasses vary in their sensitivity to Primo 250EC.
Since Poa annua is more sensitive to Primo 250EC than Bent Grass, Primo 250EC can be used to reduce the competitiveness of Poa annua in Bent Grass golf greens.
Primo 250EC can be integrated into existing Poa annua control programs.
Low rates of Primo 250EC (that provide growth suppression of Poa annua, but not Bent Grass) applied during peak growth periods may enable a slow transition in the golf green sward composition away from Poa annua and towards a higher percentage of Bent Grass.

Bahia Grass (Paspalum notatum) Management:

Different grasses vary in their sensitivity to Primo 250EC and Monument Liquid.
Bahia Grass is very sensitive to the combination, resulting in control of seedheads as well as vegetative growth suppression.
Apply the combination as soon as seedheads start to form or when it becomes a regular mowing intervention issue, usually during October to January.
Apply at 4-week intervals after mowing.

Mixing:

Add the required quantity of Primo 250EC directly to a spray tank containing two-thirds of the required spray volume.
Add the rest of the water and ensure the mix is thoroughly agitated before application.
Primo 250EC can be tank mixed with Monument Liquid.

Application:

Ensure even application in order to achieve even growth reduction.
Avoid overlapping sprays.
Application Volume:
Apply Primo 250EC in 100 to 500 L/ha of water, using suitable flat fan nozzles.
Application volume should be adequate to ensure thorough and even coverage of the turf leaves and penetration to the crowns.
In higher cut turf (≥15 mm), a significant spray shielding effect can occur, impacting negatively on spray penetration and even coverage at low application volumes.
Knapsack:
- It is important to apply the correct quantity of Primo 250EC to a known area of turf.
- Apply between 2 and 10 L of water/100 m2 of turf.
- Preferably, use flat fan nozzles and ensure even coverage is achieved.
Golf Course Greens:
- Ensure product placement as uniformly as possible onto leaves and into crowns.
- Ideal application volume should be 350 to 500 L/ha.
- For best results, use medium [XR Teejet* (11004 or 11005)] to coarse [Turbo Teejet* or AIXR Teejet* (11004 or 11005)] nozzles, at 5 km/h and 3 bar pressure.
- Boom height should not exceed 50 cm above the ground.
All Other Turf Areas:
- Ensure product placement as uniformly as possible onto leaves and into crowns.
- The ideal application volume should be 200 to 500 L/ha.
- For best results, use medium [XR Teejet (11004 to 11008)] to coarse [Turbo Teejet or AIXR Teejet (11004 or 11005)] nozzles, at 8 km/h and 3 bar pressure.
- Boom height should not exceed 50 cm above the ground.
Bahia Grass Suppression and Seedhead Control:
- Ensure product placement as uniformly as possible onto leaves and into crowns.
- The ideal application volume should be 200 to 500 L/ha. For best results, use coarse [Turbo Teejet or AIXR Teejet (11004 or 11005)] nozzles at 8 km/h and 3 bar pressure.
- Boom height should not exceed 50 cm above the ground.
Non-ionic Surfactants:
- For Bahia Grass suppression and seedhead control when tank mixing with Monument Liquid, use Agral (600 g ai/L) at 0.42% v/v or 420 mL/100 L spray mix.
- Alternatively, use other quality non-ionic surfactants (1000 g ai/L formulations) at 0.25% v/v or 250 mL/100 L spray mix.

Restraints:

Do not use on bowling greens.
Do not apply to turf recovering from wear, renovation or turf affected by disease, waterlogging or other stresses.
Do not use where growth regulatory effects are likely following the application of a fungicide or any other material.
Do not apply to turf going into or coming out of dormancy.
Do not apply if rainfall is expected within 1 hour, and do not irrigate turf for at least 1 hour after application.
Do not apply to Kentucky Bluegrass as damage may occur.

Compatibility:

For common couch, hybrid couch and kikuyu turfgrasses only: Primo 250EC is compatible with some formulations of products containing the following chemicals: 2,4-D amine, bromoxynil, MCPA/bromoxynil/dicamba, MCPA ester/bromoxynil, MCPA ester/bromoxynil/dicamba, MCPP/2,4-D amine/dicamba or MCPP/dicamba.
However, some transient discolouration of the treated turf may occur after application of a tank mix.
For the treatment of broadleaf weeds in turf with herbicides other than those indicated above, it is recommended to apply Primo 250EC and the broadleaf weed herbicides separately, allowing at least 10 days between an application of Primo 250EC and the broadleaf weed herbicides.

Re-Entry Period:

Do not enter treated areas without protective clothing until the spray has dried.
Do not allow the public to enter treated areas until the spray has dried.

Protection Of Wildlife, Fish, Crustaceans And Environment:

Dangerous to fish larvae and oysters.
Do not contaminate dams, rivers, streams, or stormwater drains with concentrate or used containers.
Wash spraying equipment and mixing and measuring utensils with water on the grass.

Storage:

Store in the closed, original container in a cool, well-ventilated area.
Do not store for prolonged periods in direct sunlight.

Safety Directions:

It will irritate the eyes and skin. Repeated exposure may cause allergic disorders.
Avoid contact with the eyes and skin.
When opening the container and preparing spray wear:
- cotton overalls buttoned to the neck and wrist (or equivalent clothing)
- elbow-length PVC gloves
Wash your hands after use.
After each day’s use, wash gloves and contaminated clothing.

First Aid:

If poisoning occurs, contact a doctor or the Poisons Information Centre. Phone Australia 131 126.

For further information, refer to the Safety Data Sheet (SDS).

This information and product advice is not intended as advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Withholding Period

Withholding Period Details: (WHP):

WHP: Do not graze treated turf/lawn or feed turf/lawn clippings from any treated area to poultry or livestock.

SDS & Technical

Primo 250EC Turf Growth Regulator Label	Download Pdf
Primo 250EC Turf Growth Regulator SDS	Download Pdf
Primo 250EC Turf Growth Regulator TechSheet	Download Pdf