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 elegant plants feature a variety of striking flower shapes in a range of colours, writes Miranda Kimberley.

Business planning: The labour challenge

Business planning: The labour challenge

With staffing becoming increasingly problematic, Neville Stein looks at the alternatives to finding good recruits.

Growing media: options for ornamentals growers as price increases loom

Growing media: options for ornamentals growers as price increases loom

Reviewing your growing-media use could open up new markets as well as bringing time and labour savings, Sally Drury suggests.

Editorial ... Supporting horticultural excellence

Editorial ... Supporting horticultural excellence

The team at Horticulture Week are delighted to launch the leading industry awards schemes for 2018 supporting, encouraging and broadcasting excellence across all areas of horticulture business, people and places.

Opinion... Pepper breeders' wealth of knowledge

Opinion... Pepper breeders' wealth of knowledge

Peter Seabrook looks forward to garden centre pepper-tasting weekends.

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.

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