29 May - Check for root rot

Thielaviopsis (black root rot) - Check for patchy black damage on roots plus black lesions at the base of stems alongside leaf yellowing. Drench with Cercobin WG (EAMUs required), Octave or spray Switch and prevent infections using Prestop (EAMU 2012-0564), Trianum P or Serenade ASO (EAMUs required).

Powdery mildew - Spray Amistar (EAMU 2009-0443), AQ10 (EAMU 2012-1324), Bumper 250EC (EAMU 2014-1274), Corbel (not on roses), Cyflamid (EAMU 2007-0512), Folicur, Kindred, food-grade potassium bicarbonate, Nimrod, Signum (EAMU 2012-2141), Stroby WG, Systhane 20EW or Takumi SC (EAMU 2013-1294) depending on crop situations.

Scab - Check ornamental Malus, Chaenomeles, Crataegus and pyracantha. Apply Captan 80WDG (EAMU 2014-2510, nursery fruit trees only), Karamate Dry Flo Neotec, Scala (EAMU 2011-1315), Systhane 20EW or Topas.

Willow anthracnose - Apply Amistar (EAMU 2009-0443), Folicur, Signum (EAMU 2012-2141) or Switch through the spring and summer to prevent stem dieback and large unsightly cankers.

Woolly aphid - Control on outdoor Fagus, Malus and pines using Calypso (EAMUs required), Chess WG, Dursban WG (non-IPM), Gazelle SG, Hallmark WZT (EAMU 2008-2944) or Movento (EAMU 2011-1987).

Scale insects - Control on Aesculus, camellia, Laurus nobilis, Hedera, Ribes and Taxus with Chess WG (EAMU 2013-2016), Decis (non-IPM), Hallmark WZT (non-IPM, 2008-2944), Pyrethrum 5EC, Savona, SB Plant Invigorator or Spruzit.

Sawfly - Aquilegia, robinia, older roses, Tilia and others are susceptible. Check for small green caterpillars that defoliate plants. Spray outdoor crops with Decis or Tracer (EAMU 2008-2908) and indoor crops with Dimilin Flo or Pyrethrum 5EC.

Pythium & Phytophthora spp. - Avoid overwatering vulnerable plants - Chamaecyparis, Cytisus and Taxus. Control active infections using Fenomenal or Subdue. Re-populate composts with beneficial micro-organisms using Prestop (EAMU 2012-0564), Serenade ASO (EAMUs required) or Trianum P.

Fireblight - Check Rosaceae subjects, especially ones that bore flowers last year. Prune and burn all suspect plant material. Cold damage and old scab infections bring similar symptoms.

Mulches - Apply bark mulch to compost surfaces ensuring good coverage to retain moisture and prevent weed infestation. Coir mats, polythene slips, grit and shredded Miscanthus are also available in varying quantities.


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 tidy evergreen trees are not just for Christmas and come in a range of shapes and sizes, writes Miranda Kimberley.

Pest & Disease Factsheet - Green manure crops

Pest & Disease Factsheet - Green manure crops

Valuable tools to combat pests and diseases, improve soils and boost nutrient levels.

Pots and containers

Pots and containers

Superior propagation products can justify extra expenditure by providing precise cell fill, optimum root development and healthy plugs, writes Sally Drury.

From The Editor - Production and retail showcase

From The Editor - Production and retail showcase

With the first entry deadlines for two of the industry's leading awards schemes looming, this is the perfect time to start thinking about which categories can best support your goals this year - and get cracking on those entries.

Seabrook on...Product showcase and valuable networking at Four Oaks

Seabrook on...Product showcase and valuable networking at Four Oaks

The Four Oaks Trade Show is a must on my calendar.

According To Edwards ... Changes large and small anticipated for UK producers

According To Edwards ... Changes large and small anticipated for UK producers

No one knows the changes that Brexit will impose on the UK over time. Some will surely be massive and they are already being guessed at. But there will be little changes too and some of those will ripple out over time to surprisingly large effect. I don't pretend to know what will happen, but it's fun to speculate.

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

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.