1 August - Airflow & nutrients

Botrytis - Maintain good airflow around crops with a lot of soft foliage, especially on changeable days. Vent as much as possible and treat using Prestop (EAMU 2015-2773), Signum (EAMU 2012-2141), Switch or Serenade ASO (EAMUs required). Protect crops using Rovral WG (EAMU 2011-3200) or Scala (EAMU 2011-1315).

Conductivity - Take weekly readings of liquid-feed stock solutions and composts to build up a picture of CRF nutrient release, using liquid feeding to maintain good levels of macroand micro-nutrients. Conductivity changes with temperature so take measurements at known water temperatures for consistency.

Spider mites - Borneo (EAMU 2008-1216), Masai, Dynamec and SB Plant Invigorator are useful products at this time of year. Use predators on vulnerable crops too, first checking pesticide compatibility. Naturalis-L will provide good knock-down control in tunnels and glasshouses with more than 60 per cent humidity.

Downy mildew - Control fungal growth using Amistar (EAMUs required), Fenomenal (EAMU 2013-1990), Fubol Gold WG (EAMU 2013-2288), Invader (EAMU 2012-0109), Paraat (EAMU 2011-2585), Pergado Uni (EAMU 2012-1605), Revus (EAMUs required), Signum (EAMU 2012-2141), Subdue or Valbon (EAMU 2014-2325).

Powdery mildew - Adding a wetting agent to mixes (check labels and not with emulsifiable concentrates) helps to extend control of persistent mildew, especially on roses and trees.

Pergado - Uni MAPP 15734 has an end-use date of 31 August 2017. The replacement MAPP 17513 currently has no onor off-label approvals for ornamentals.

Euphorbia - Avoid long periods of wet compost to prevent and control Phytophthora spp. infections that can spread rapidly through crops. Use Fenomenal, Subdue or Previcur Energy (EAMU 2011-1557) where infection has established. Plant Trust contains a slow-release formulation of fosetyl-aluminium; Prestop (EAMU 2015-2773), T34 Biocontrol (EAMUs required) and Trianum P are biological alternatives for compost applications. Remove and destroy any plants showing signs of dieback and wilting.

Feeding - Change to high-potash (K) products to harden soft foliage and green-up pale older leaves. Use products such as Hortifeeds 2:1:6, Peters Plant Finisher, Sangral 1:1:3, Solufeed 1:0:3, Universol Violet or Vitax 2:1:4.

Vine weevil - Continue adult controls using foliar sprays of Chess WG, Hallmark WZT (EAMU 2008-2944) or Steward (EAMU 2008-2905) onto foliage of vulnerable ornamentals.

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



These compact, brightly coloured flowers can be very attractive for impulse sales, notes Miranda Kimberley.

Fertilisers Special Report - invaluable nutrition

Fertilisers Special Report - invaluable nutrition

Using the right fertilisers on your crops can make all the difference when it comes to securing repeat customers, Sally Drury advises.

IPM Essen Show Preview - New look for top trade fair

IPM Essen Show Preview - New look for top trade fair

Venue modernisation will mean better display space for exhibitors at Europe's largest trade fair for the horticulture industry, says Gavin McEwan.

Opinion... Gardening needs better promotion

Opinion... Gardening needs better promotion

British horticultural firms and organisations have not been the best at working together to promote our industry.

Opinion... A wish list for unblinkered thinking

Opinion... A wish list for unblinkered thinking

Opinion... A wish list for unblinkered thinking

Opinion... A wish list for unblinkered thinking

Generations of ordinary British people have been let down by weak, visionless leaders -- politicians more engaged by the next election than our national best interest.

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