13 May - Mildew and mites

Powdery mildew Spray Amistar (EAMU 2009-0443), AQ10 (EAMUs required), 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.

Mites Check Alnus, Fagus, Fraxinus, Pyrus, Quercus ilex, Ribes, Sorbus or Viburnum for signs of blister and felt mite damage. Apply Hallmark WZT (EAMU 2008-2944), Dynamec or Envidor (EAMU 2016-0997) if seen.

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

Predators Use an IPM approach to control pests, diseases and weeds. For pests on protected crops, use products with short persistence such as Aphox, Majestik, Savona, SB Plant Invigorator, Spruzit or Pyrethrum 5EC before introducing predators.

Leaf-curling aphids Control on ornamental cherries and other plants such as Viburnum carcephalum with Calypso (EAMUs required), Chess WG (EAMU 2013-2016), Gazelle SG or Movento (EAMU 2011-1987), which will provide good control even after pests have distorted the foliage.

Western flower thrips Control scratching or flecking damage on foliage and flowers with Conserve, Dynamec or Naturalis-L. Control using Amblyseius andersoni, A. cucumeris, A. montdorensis and A. swirskii mites or Orius spp. on foliage and Macrocheles robustulus mites on soil or growing-media surfaces. For additional control, choose Gaeolaelaps aculeifer or Stratiolaelaps scimitus (formally Hypoaspis miles). Steinernema feltiae parasitic nematodes can be applied to foliage, soils and growing media depending on the pest life stage. Control products include Actara (EAMU 2014-0186), Calypso (EAMU 2014-2151), Conserve, Decis (EAMU 2014-1011), Dynamec, Hallmark WZT (EAMU 2008-2944), Majestik, Naturalis-L, Pyrethrum 5EC, Savona, SB Plant Invigorator, Spruzit or Toppel 100 (EAMU 2015-1454) depending on location and use of predators.

Caterpillars Install pheromone lures (in Delta traps) over vulnerable protected crops to identify damaging caterpillar species. This helps with tortrix moths and timely insecticide applications. Control pests on outdoor Betula, Cratageus and Carpinus using Decis, Dimilin Flo, Insegar WG, Runner (EAMU 2012-0448), Explicit (EAMU 2011-2090), Toppel 100 (EAMU 2015-1454) or Tracer (EAMU 2008-2908).

John Adlam, Managing director, Dove Associates, HorticultureWeek.co.uk/nursery


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

Zantedeschia

Zantedeschia

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.

Products special: machinery upgrades

Products special: machinery upgrades

Flexibility, accuracy and speed are the main areas where the latest equipment is improving on older models, Sally Drury finds.


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