11 April - Notify beekeepers

Bees: Notify local beekeepers if spraying flowering crops. Check product labels for information and only apply when bees are not foraging - early morning or early evening depending on the weather.

Scab: Check local weather forecasts for vulnerable times of scab infection on Chaenomeles, Crataegus, Malus, pyracantha, Pyrus and sorbus. The disease can infect overhead irrigated protected crops, too. Alternate protectant and eradicant products for good control such as Topas followed by Dithianon WG, Radspor FL or Systhane 20EW.

Anti-transpirants: Apply to newly potted crops to prevent moisture loss and wind damage. Products include Wiltruf S600 and Orosorb.

Midge: Check Crataegus spp. for gall tip midge. Eggs deposited in April/May hatch and feeding damage causes infected tips to distort into rosette-like galls. Gazelle SG, Hallmark WZT (EoA 2008-2944) or Dursban WG should control.

Despatching plants: Make sure that any plants left over are still included in your pest and disease control programmes. They can act as a "sink" for transfer of infection onto new crops if left untreated.

Downy mildew: Continue controls using Aliette 80WG, Amistar (EoA 2009-0443), Folio Gold (EoAs required), Fubol Gold WG (EoA 2012-0217), Invader (EoA 2011-0717), Paraat (EoA 2011-2585), Signum (EoA 2009-1842) or Valbon (EoA 2011-1123) on digitalis, pansies, roses, buddleia, hops and hebes. Morning dew under protection and damp days both encourage levels of infection.

Buddleia: Black sticky spots on leaves and stems of protected buddleia, digitalis or Phygelius are a natural plant response to high day and low night temperatures. There is no damage to the leaf underneath the spot and irrigation or hand watering will remove it over a couple of days.

Aphids: IPM-compatible products include Aphox, Chess WG, Majestik, Naturalis-L, Savona and SB Plant Invigorator. Apply Aphidius colemani for melon cotton and peach potato aphids and Aphidius ervi for the potato aphid, glasshouse potato aphid and others. Non-IPM products include Actara (EoA 2008-2801), Calypso (EoAs required), Decis, Gazelle SG, Hallmark WZT (EoA 2008-2944) or Intercept 70WG. Check IRAC codes to avoid resistance. Woolly aphids are also starting to colonise Fagus, ornamental cherry, Malus and pines.

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

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 compact, brightly coloured flowers can be very attractive for impulse sales, notes Miranda Kimberley.

Fertilisers Special Report - invaluable nutrition

Fertilisers Special Report - invaluable nutrition

Using the right fertilisers on your crops can make all the difference when it comes to securing repeat customers, Sally Drury advises.

IPM Essen Show Preview - New look for top trade fair

IPM Essen Show Preview - New look for top trade fair

Venue modernisation will mean better display space for exhibitors at Europe's largest trade fair for the horticulture industry, says Gavin McEwan.

Opinion... Gardening needs better promotion

Opinion... Gardening needs better promotion

British horticultural firms and organisations have not been the best at working together to promote our industry.

Opinion... A wish list for unblinkered thinking

Opinion... A wish list for unblinkered thinking

Opinion... A wish list for unblinkered thinking

Opinion... A wish list for unblinkered thinking

Generations of ordinary British people have been let down by weak, visionless leaders -- politicians more engaged by the next election than our national best interest.

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