10 December - Predator watch

Pest control: Where predator applications have finished, consider applying broad-spectrum, contact-acting products such as Decis or Hallmark WZT as a clean-up.

John Adlam goes on predator watch
John Adlam goes on predator watch

If predators are still being used and control is required, then choose Majestik, Pyrethrum 5EC, Spruzit or SB Plant Invigorator. Keep applying slug pellets.

Choisya Monitor: watering to avoid Pythium, Phytophthora and Fusarium infections. Remove dead and dying plants - drench the remaining crop (within their irrigation regime) using Fenonemal, Prestop or Previcur Energy (EAMU 2011-1557).

Winter wash: Certis Spraying Oil can be used as a "winter wash" on dormant crops to control overwintering mealybugs, scale insects and spider mites.

Sciarid flies: Control sciarid and shore fly larvae on heated propagation beds using nematodes (Steinernema feltiae) or introduce Hypoaspis sp. or Macrocheles mites. Alternatively, Atheta coriaria can be used if compost temperatures remain above 15 degsC over the winter. Root rotting from feeding damage can be prevented using Trianum P, Revive P or Serenade ASO (EAMUs required) - or Prestop if cuttings have rooted. Yellow sticky traps attract adults away from compost surfaces and foliage.

Liverwort: Depending on crop location and type, consider trialling Venzar Flowable, Sumimax (2008-2881) or Sultan 50SC to clean up pot surfaces.

Disease control: Powdery mildews and fungal leaf spot pathogens produce winter resting spores that will go through the colder months to re-emerge next season. Make sure that you are satisfied with the control achieved. Many products are systemic and slow to work effectively.

Couraze: A revised label (MAPP 13862) is available detailing the neonicotinoid restrictions.

Fungicides: Frost-free, protected nursery stock can still be sprayed with Octave, Rovral WG or Switch during winter as a precautionary disease control, especially for Botrytis. Add a wetting agent for plants with hairy foliage and use an air-assisted sprayer to get good penetration. Focus applications on Helleborus, Cordyline, lavenders, phormiums and yucca. Apply in the morning to allow foliage time to dry.

Trimming: Wait until late winter/early spring before trimming. Crops will be at greater risk of stem dieback and Botrytis at this time of year.

John Adlam, Managing director, Dove Associates

HortWeek.com/ornamentals


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

Business Planning - Staff are your greatest asset

Business Planning - Staff are your greatest asset

An effective strategy to retain staff is the best way for any business to avoid a potential recruitment crisis, Neville Stein advises.

GroSouth 2017 update

GroSouth 2017 update

First-time and established exhibitors are preparing to showcase products and services at this year's show in West Sussex, Gavin McEwan reports.

Pest & Disease Factsheet - Vine weevil

Pest & Disease Factsheet - Vine weevil

Avoid costly damage by this serious plant pest.


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.

Opinion... Unbeatable delight of quality plants

Opinion... Unbeatable delight of quality plants

Viewing top-quality plants, both growing and on sale, always gives me pleasure.


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