28 April - Watch out for uneven irrigation

Dry pots - Watch out for dry pots within a block. Automatic irrigation systems can be very uneven in distribution if unchecked. Different compost types on the same bed and crops of different size can result in some being over-watered and others under-watered. The best method I know is to check the weight of pots.

Caterpillars - Now active on Betula, Carpinus, Crataegus, Choisya, rose and other plant species causing feeding damage. Decis, Toppel 100EC and Runner (SOLA 2008-2903) can be used on outdoor ornamentals. For protected IPM systems, consider Conserve, Dimilin Flo or Nemolt (SOLA 2010-2131).

Mist - Check the operation of mist systems and replace defective parts. The leaf sensors should have a surface that is clean and flat - light sensors should have a clean "window". Nozzles with last year's algae growth on them can be taken out and put in a tank of Jet 5 to clean them up.

Rust - Monitor Campanula, Fuchsia, hollyhocks, Hypericum, Iris, Mahonia, roses and Vinca. Check stems and backs of new leaves and spray with Amistar (SOLA 2009-0443), Bumper 250EC (SOLA 2009-0707), Nimrod, Signum (SOLA 2009-1842) or Systhane 20EW on non-edible plants to reduce the disease's damaging effects.

Aquilegia - The very small, green caterpillars of the Aquilegia sawfly can cause widespread defoliation of these plants. If you see any foliage damage, spray outdoor crops with Decis or Toppel 100EC or indoor crops with Nemolt (SOLA 2010-2131) or SB Plant Invigorator immediately. A delay of two days can be too late.

Soil sterilisation - Soil temperatures are warm enough for Basamid applications. The soil must be deeply cultivated and fine to get good control of weed seeds, pests and diseases. Polythene coverings increase vapour intensity. Leave them on until the last possible moment - the soil will remain weed-free for longer.

Conductivity meters - Useful for measuring the level of nutrients in liquid feeds and compost. Take weekly readings to build up a picture of nutrient release of controlled-release fertilisers and optimum growth, using liquid feeding as a top-up. Conductivity is changed by temperature so take measurements at a known water temperature.

John Adlam, Managing director, Dove Associates


Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus

Read These Next

Tomorrow's tractors

Tomorrow's tractors

These machines have advanced rapidly over recent years but what does the future hold? Sally Drury looks ahead.

Climbing roses

Climbing roses

Walls, trellises, pergolas and even trees can all be brightened up by these beautiful blooms, writes Miranda Kimberley.

Pest & Disease Factsheet - Mealybugs

Pest & Disease Factsheet - Mealybugs

Vines, tomatoes and tropical plants are among those at risk.

Opinion... Shining a light on trading with Europe

Opinion... Shining a light on trading with Europe

Accurate figures are notoriously difficult to get at, but without doubt the UK imports a great deal of its ornamental plant requirement.

Opinion... Unbeatable delight of quality plants

Opinion... Unbeatable delight of quality plants

Viewing top-quality plants, both growing and on sale, always gives me pleasure.

Editorial ... More analysis and insight from bumper HW issue

Editorial ... More analysis and insight from bumper HW issue

Welcome to this bumper 72-page July edition of Horticulture Week magazine, packed with exclusive analysis, insight and expert advice on the biggest issues impacting all sectors of the UK horticulture industry right now.

Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs

Tim Edwards

Boningales Nursery chairman Tim Edwards on the business of ornamentals production

Read Tim Edwards

Ornamentals ranking

Top 30 Ornamentals Nurseries by Turnover 2017

Top 30 Ornamentals Nurseries by Turnover 2017

Tough retail pricing policies and Brexit opportunities drive the top 30 growth strategies.

Pest & Disease Tracker bulletin 

The latest pest and disease alerts, how to treat them, plus EAMU updates, sent direct to your inbox.

Sign up here

Are you a landscape supplier?

Horticulture Week Landscape Project Leads

If so, you should be receiving our new service for Horticulture Week subscribers delivering landscape project leads from live, approved, planning applications across the UK.

Peter Seabrook

Inspiration and insight from travels around the horticultural world

Read more Peter Seabrook articles