15 May - Aphids and mildew

Woolly aphid Start a tight control now on outdoor Fagus, Malus and pines using Chess WG, Hallmark WZT (EAMU 2008-2944, Movento (EAMU 2011-1987) or Toppel 100.

Only a consistent spray programme will control these persistent pests. Include an adjuvant in your spray tank, where appropriate, to increase spray effectiveness and enable better penetration of the "wool". Products such as SB Plant Invigorator and Majestik provide good contact-acting control.

Powdery mildew Spray Amistar (EAMU 2009-0443), AQ10 (EAMUs required), Bumper 250EC (EAMUs required), Corbel (not on roses), Folicur, Kindred, food-grade potassium bicarbonate, Nimrod, Signum (EAMU 2012-2141), Stroby WG, Reflect (2016-1602) or Takumi SC (EAMU 2013-1294) depending on crop location and predator use.

Compost tea Valuable disease suppression can be achieved, particularly on protected crops. Fargro, Martin Lishman, Symbio and XL Horticulture sell brewing systems.

Thrips Control scratching/flecking damage on foliage and flowers with Conserve, Dynamec or Naturalis-L. Use Amblyseius andersoni, A. cucumeris, A. montdorensis and A. swirskii mites or Orius spp. for adults/larvae. For pest pupae, use Macrocheles robustulus mites, Gaeolaelaps aculeifer or Stratiolaelaps scimitus. Steinernema feltiae parasitic nematodes can be applied to foliage, soils and growing media depending on pest life stage. Alternatively, control using Conserve, Decis (EAMU 2014-1011), Dynamec, Hallmark WZT (EAMU 2008-2944), Majestik, Naturalis-L, Pyrethrum 5EC, SB Plant Invigorator, Spruzit or Toppel 100 depending on location and predator use.

Herbicide applications Keep up-to-date on field-grown crops and newly potted stock once compost has settled. Most herbicides are poor at controlling emerged weed seedlings.

Mulches Where possible, consider applying bark mulch to compost surfaces, ensuring good coverage to retain moisture and prevent weed infestation.

Leaf miners Control leaf damage on protected, non-edible crops using Dacnusa and Diglyphus wasps alongside short-term effect products such as Dynamec or Movento (EAMU 2011-1987). Non-IPM products include Hallmark WZT (EAMU 2008-2944). Selected pheromone traps are also available for timely predator or pesticide applications.

Leaf spots Protect foliage using Amistar (EAMU 2009-0443), Bravo 500 (outdoor crops, EAMU 2011-1130), Rovral WG (EAMU 2018-0241) or Switch on hellebores, pansies, yucca, ceanothus and viburnum.

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

Read These Next

Nursery Product Special: essential machinery

Nursery Product Special: essential machinery

With labour increasingly difficult to source and getting ever more expensive, Sally Drury explores how the latest machines can help large and small nurseries.

Nursery Product Special: progressive plant labels

Nursery Product Special: progressive plant labels

Design, images, information and flexibility are all factors but the materials used to produce labels are increasingly important for customers, writes Sally Drury.

Sophora

Sophora

A graceful habit, attractive foliage and often fragrant flowers are all selling points, writes Miranda Kimberley.


Opinion... Bridges needed across the sectors

Opinion... Bridges needed across the sectors

Horticulture Week's careers guide (HW, April 2018) is a revealing insight into what constitutes "a horticulturist". Horticulture is a coherent discipline.

Opinion... Why flower shows need to evolve

Opinion... Why flower shows need to evolve

While the number of regional flower shows at stately homes and municipal public areas grows, the number of nurseries trading at these events reduces.

Opinion... Standardisation good for the trade

Opinion... Standardisation good for the trade

Horticulture could benefit from streamlining in the supply chain.


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

Horticulture Week Top 60 Ornamentals nurseries

See our exclusive ranking of ornamentals nurseries by annual turnover. 

Tim Edwards

Boningales Nursery chairman Tim Edwards on the business of ornamentals production
 

Read Tim Edwards

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