12 May - Predators & aphids

Predators - Use an integrated approach to control pests, diseases and weeds. For pests on protected crops, use products with short persistence such as Aphox, Majestik, 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 (EAMUs required), Gazelle SG or Movento (EAMU 2011-1987), which will all provide good control even after pests have distorted foliage.

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

Western flower thrips - Control scratching and flecking damage on foliage and flowers with Conserve, Dynamec or Naturalis-L. Use predators including 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 to control the pupa stage. For additional control, choose Gaeolaelaps aculeifer or Stratiolaelaps scimitus (formerly 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 (EAMUs required), 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 crop location and use of predators.

Caterpillars - Install pheromone lures inside Delta traps over vulnerable protected crops to identify damaging 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), Steward (EAMU 2008-2905), Toppel 100 or Tracer (EAMU 2008-2908).

Thielaviopsis (black root rot) - Check for patchy black damage on roots as well as black lesions at the base of stems alongside leaf yellowing. Drench with Cercobin WG (EAMUs required) or Octave, or apply a directed spray of Switch where there are active infections. Use Prestop (EAMUs required), Trianum P or Serenade ASO (EAMUs required) drenches on vulnerable crops. All applications should be within crops' irrigation regimes to avoid long periods of wet compost.

HorticultureWeek.co.uk/nursery.


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

Albizia

Albizia

Fluffy flowers and bipinnate foliage make these rarely seen shrubs and small trees highly prized, says Miranda Kimberley.

Pots and containers

Pots and containers

Taking advantage of the latest available sizes, shapes and formats could help you boost production as well as sales, Sally Drury suggests.

Pest & Disease Management - Fusarium patch

Pest & Disease Management - Fusarium patch

Avoid damage to ornamental lawns and sports turf


Dixon on... Progressive innovation

Dixon on... Progressive innovation

Horticulture is typified by innovative thinking. Leaders in change are producers of fresh produce propelled by cost reductions and price stagnation.

Seabrook On... Sensible pricing levels

Seabrook On... Sensible pricing levels

One of the big retail chains has flower seeds on sale at 25p a packet, while one of the specialist mail-order companies has six nigella plants on offer at £15 plus £4.95 carriage charges.

Production stars take innovation lead at UK Grower Awards and Garden Retail Awards

Production stars take innovation lead at UK Grower Awards and Garden Retail Awards

Over the past week it has been the great privilege of the Horticulture Week team to welcome more than 700 leading horticulture professionals to three great industry events - the Garden Retail Awards 2017, the UK Grower Awards 2017 and the third Garden Retail Summit, all hosted by Horticulture Week.


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.