May Tennis Diary 2020

Editorin Tennis
Expected weather for this month:

After April's hot spell, we can expect better growing conditions in May, with rainfall and temperatures around average for the month.

Key Tasks for May

With so much uncertainty around at the moment, and Government guidelines on how and when people can begin to participate in sport again still to be confirmed, we suggest you keep in contact with your respective sport's governing body for any up to date information.

If you have been given permission to continue to maintain your courts, then the following should help.

Most of your aeration operations should have been completed during the winter period. Generally, we do not aerate clay soil profiles after January, as we do not want to encourage cracking of the clay surfaces. However, if there is a need to help remove surface water from the courts, we can utilise the sarrel roller which lightly aerates the top 25-30mm, allowing any surface water to drain down deeper into the soil profile. Carry out the following regular tasks:

  • Continue to roll the courts
  • Fortnightly light scarification or verticutting
  • Seed sparse or bare areas

Rolling. It is essential to carry out an effective rolling programme. Continue to roll the courts, firstly across the line of play, followed by rolling down the length of play. Timing of this operation is vitally important. Trying to roll when soil conditions are wet or too dry will not achieve the desired effect.

Mowing. The mowing height on the courts should be lowered to around 8-10mm for the playing season, but remember not to remove more than 1/3 of total grass height in each cut.

Light scarification or verticutting can be carried out at fortnightly intervals pre-season. Removing horizontally growing grasses and surface organic matter are always beneficial for the onset of court preparation which, together with brushing, will improve the quality of cut.

Other Tasks:

  • Ensure drainage outfalls, channels and ditches are clear
  • Inspect stored posts, nets, seating and notice/score boards
  • Inspect and remove debris from playing surface
  • Regular sweeping and brushing
  • Repair any hollows or damaged areas
  • Repaint lines

May is a month when spring really bounces into full flourish, with fresh leaves on all of the trees, and many flowers coming into colourful bloom. The grass plant takes full advantage of longer days, warmer temperatures and available soil moisture by producing a large volume of leafy growth. In a naturalised situation, this is energy expended in advance of flowers and then seed later in the summer. In a sports turf situation, the plant is still responding to these cues and drives, but it is our intervention with a lawn mower which tames the growth into a lush sward, albeit with one species of note proving the exception, Poa annua.

The start of May often heralds the onset of Poa annua seed heads across surfaces, and a subsequent drop in aesthetics and playing performance as a consequence. Grooming allows for mechanical removal of the seed heads and is a tried and tested method for minimising the negative effect on play and performance during the annual window of Poa annua flowering.

May 2020, however, marks the first opportunity for UK turf managers to access and utilise the plant growth regulator - prohexadione-calcium. Prohexadione-calcium is a Class A late gibberellin inhibitor, a trait it shares with the long established and successful trinexapac-ethyl. With regard to Poa annua, prohexadione offers two advantages; it regulates Poa annua on a par with perennial species, this allows for greater consistence of growth regulation across surfaces over time. Secondly, it regulates the flowering potential of Poa annua, a trait which mitigates the negative consequences of this plant’s inflorescence upon both aesthetics and playing performance.

In normal circumstances, both those metrics would be primary areas of day to day concern. Of course, we presently remain in a situation outside of normal circumstances, therefore maintaining playing quality and aesthetics from the ingress of Poa annua flowers is likely to be on the lower end of priorities. That being said, prohexadione-calcium does represent an opportunity to capture two birds with one stone. First by regulating plant growth and thus easing pressure on mowers and staff alike, then as a secondary effect, the suppression of Poa annua flower head production; something which, by extension, reduces the number of seeds that subsequently form and then drop directly into playing surfaces. Over time and with complementary integrated maintenance principles, this will reduce the ability of Poa annua to regenerate in swards where its presence is deemed undesirable. In simplistic terms, less seeds means less opportunity for Poa annua to colonise an environment over time.

As a plant, Poa annua is by its very nature a pioneer species. Like similar plants low down the line of succession such as Cardamine hirsute (Hairy Bittercress), Poa annua has evolved to be one of the first plants to colonise challenging environments rapidly. As such, it expects environmental conditions may change rapidly, from hospitable to inhospitable. This is why, unlike the perennial grasses Agrostis spp., Festuca spp. and Lolium spp., Poa annua has retained the ability to flower profusely at low heights of cut.

Nutrition programmes have, in many cases, understandably been reduced to maintain plant health at acceptable levels rather than peak performance. It would be wise for turf managers to keep this under review, using their knowledge and expertise to guide them on a case by case basis. That said, inputs such as seaweed extract will help to prepare the plant for oncoming abiotic stress such as heat and water deficiency, so it would be advantageous to maintain applications. Plants treated with seaweed ahead of water stress events will also recover faster once soil moisture levels are replaced.

Water management is a vitally important aspect of maintaining any grass plant; a well maintained, professionally set up and prepared irrigation system, ‘ready and raring to go’, will be vital if water stress builds as we enter hotter weather. Soils with a capacity to manage water ingress and holding potential will be able to maximise available water and extend the periods by which plants are able to survive before irrigation is required. The continued application of water management products in the form of surfactant wetting agent programmes will significantly assist this principle and are to be recommended. This is because the efficacy of block co-polymer molecules requires a build-up in the soil to optimum levels over time - proactive approach, rather than a reactive one.   

Aeration, as ever, remains a vital component for optimum plant-soil ecosystem function. Wherever possible, continuation of efficient methods of aeration, such as star and sarrel tine rolling, will allow optimised soil life respiration and water ingression.

Insect pests populations have been elevated this year as mild winter weather and the end of old withdrawn insecticide use patterns combine, with many areas once again subject to secondary damage from predators. It may seem very low down the priority list currently, but active monitoring of insect activity now, to assist in optimising control through the summer, will pay dividends in minimising the problem and damage for next year. If chafer grubs are on your site, then installing pheromone traps in May allows you to plot their life cycle against integrated pest management plans and help inform treatment interventions later in the year. Whether that be substances on Emergency Authorisation, entomopathogenic nematodes, or a combination of both.

Writing this diary is always a balance of providing underpinning knowledge, insight and helpful reminders for the appropriate course of action to take at a given time of year; advice which must reach across the industry covering all sports, all levels, and budgets. With that in mind, one is always conscious that such advice should be there to be received by the reader on the basis that they take from it what is reasonable, relevant and practical for them and their facility. Never before have we been in a situation where facilities across all aspects of the industry are collectively faced with the challenges of balancing plant health, budgets and workloads to the extent we are now experiencing - in the midst of the ongoing global coronavirus pandemic.

It is then that the principle of taking from these writings what is reasonable and appropriate for you is more relevant than ever. As with any challenge or test life throws up, you can of course do no more than your best effort.

James Grundy
Senior Technical Manager – Amenity | MBPR

You should have had your mower serviced and sharpened by now.

  • Inspect machinery and equipment
  • Clean after use
  • Remember to check air filters
  • Inspect and reset mowing blades on cylinder mowers to ensure they remain sharp

Used Machinery for Sale

Grounds Training was established in 2006 to provide a complete and unique service delivery training courses for the sports turf industry. We are now the go-to provider for on-site, bespoke training for groups. Grounds Training also works with the industry’s awarding bodies – Lantra and City & Guilds (NPTC).

We have  a wide range of ground care machinery courses, safe handling of pesticides Lantra Accredited Initial  Sports Line Marking and Synthetic Sports Surfaces course . All our courses are delivered by industry qualified instructors registered with  Lantra Awards and or NPTC.

We also offer a small number of open courses at our site at Allscott ,Telford.

All the course we have to offer can be found by visiting




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