ALS Logo
ALS Logo
Facebook Button Twitter Button
5L PRIMO MAXX II

Primo Maxx II Growth Regulator



MAPP no. 17509

Active Ingredients: 116.4 g/l trinexapac-ethyl

Trinexapac-ethyl is the active ingredient in Primo Maxx II that works by redirecting plant growth. It specifically targets the gibberellic acid site responsible for cell elongation in grass.


Changes in a co-formulant ingredient mean that products with the previous MAPP no. 14780 was available for sale until the 30th April 2017 with a use-up period expiring on the 30th April 2018. The new MAPP no. 17509 has replaced this product.

Not only does Primo Maxx II inhibit vertical growth, but actually diverts plant growth downward into the root system to produce increased food reserves and lateral stem development. This in turn produces a thicker, healthier sward that better equips your turf to withstand temperature extremes, moisture loss, traffic and wear and tear, and even helps in the management of Poa annua.


Primo Maxx II can be used on all well maintained quality turf grass areas such as golf course fairways, golf tees, greens and surrounds. It can also be used to help manage areas which are difficult to mow such as sloping banks or turf edges by flower beds and pavements.

  • Easy to use liquid formulation.
  • Reduces grass top growth.
  • Flexible application rates for all turf surfaces.
  • Improves turf colour and appearance.
  • Cuts down mowing frequency - one application can reduce grass clippings by up to 50%.
  • Cuts down wear and tear on machinery.

Pack Coverage: Variable

The purchaser and/or end users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice. All operators must be trained and certificated in using and applying any Ministry Approved professional product.

Typical Fairway and Tee Programme

Apply at 4 - 6 week intervals. Commence applications when the turf is actively growing

 Application 1Application 2Subsequent Applications
Primo Maxx II0.4 - 0.8 l/ha0.8 - 1.2 l/ha0.8 - 1.2 l/ha
Minimum nitrogen input per application (N)2.5 kg/ha2.5 kg/ha2.5 kg/ha
Application Volume (l/ha)250 - 400250 - 400250 - 400

For fairway/semi-rough and greens programmes, consider amending granular fertiliser rates to take account of additional foliar applied nutrient. Apply through to October to build carbohydrate reserves and improved over-winter disease tolerance. A maximum rate of 2.4 l/ha can be used on rye-grass fairways or tees, and 1.6 l/ha on compositions of Poa, bent grass and Fescue fairways and tees.

Typical Greens Programme

Apply at 14 - 28 day intervals as appropriate. Commence applications when the turf is actively growing

 Application 1Application 2Subsequent Applications
Primo Maxx II0.2 l/ha0.2 - 0.4 l/ha0.2 - 0.4 l/ha
Minimum nitrogen input per application (N)2.5 kg/ha2.5 kg/ha2.5 kg/ha
Application Volume (l/ha)250 - 400250 - 400250 - 400

Rough and Semi Rough Programme

Apply at 4 - 6 week intervals as appropriate. To aid management of peaks of rough growth

 Application 1Application 2Subsequent Applications
Primo Maxx II0.6 - 0.8 l/ha1.2 - 1.6 l/ha1.2 - 1.6 l/ha
Minimum nitrogen input per application (N)2.5 kg/ha2.5 kg/ha2.5 kg/ha
Application Volume (l/ha)250 - 400250 - 400250 - 400

A maximum rate of 3.2 l/ha can be used in rye-grass roughs and 2.4 l/ha on compositions of meadow grass, Fescue and bent grass roughs.

Note: The above are provided as typical Primo Maxx II programmes, by Syngenta, but rates and timings should be adapted to local conditions as appropriate. Research trials and recommendations in this brochure include results of work using Primo Maxx and Primo Maxx II.


Use plant protection products safely. Always read the label and product information before use.

PRIMO Maxx II may be applied with knapsack sprayers, hand sprayers, boom sprayers and spray-gun application devices.


For further information regarding Primo Maxx II, contact our technical sales team on 01952 641949.

The purchaser and/or end users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice. All operators must be trained and certificated in using and applying any Ministry Approved professional product.

Please be aware that by proceeding you are purchasing a professional pesticide product.

You must ensure the end user of these products complies with the DEFRA/HSE Code for the Safe use of Pesticides:

"By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out."

More Information View Training Courses
Delivery charge (if applicable) applied at checkout. Next working day delivery is available on this product, as an option on orders placed before 12 noon - excludes festive season & bank holidays. Please note deliveries to Highlands, Cornwall and more remote areas may take longer. Surcharges apply for non mainland locations, call for more information. More delivery info


Please Note: If you have any access restrictions for lorries or large vehicles please speak to our sales team on 01952 641949.


Collection from our Telford, Shropshire, Trade Counter is available for this product. More info on collections