11 September - Botrytis and winter

Botrytis Now is the time to check vulnerable crops, especially with cool, dew-filled nights. Check closely spaced crops with dense, soft foliage and improve airflow in tunnels and glasshouses. Prevent infections with compost tea — monthly applications from now on — and, where infections have taken hold, use Amistar (EAMUs required), Rovral WG (EAMU 2011-3200), Scala (EAMU 2011-1315), Serenade ASO (EAMUs required), Signum (EAMU 2012-2141) or Switch.

Winter readiness Check fleece and Cosytex for any holes. Replace damaged tunnel sheets while air temperatures are still warm enough. Clean all gutters and downpipes on structures. Check drainage on sand beds and stir up the sand if percolation is low from compost deposits and moss and weed growth. Strim ditches to remove large weeds and encourage free-flowing water.

Bed watering Automatic irrigation systems can produce an uneven output — check crops along bed edges and pathways for drought. Keep new and old crops separate as well as different crops in different compost types and pot sizes where possible.

Frost protection Prepare for cold nights by moving vulnerable plants to protected, frost-free structures. Repeat applications of Cropaid or Compo’s Frost Protect before sudden frosts can help protect susceptible buds, stems and foliage from unnecessary damage. Set down crops in the right place for winter protection to avoid last-minute changes. Make sure all heaters have been serviced and vent gear is greased up.

Powdery mildew Include Corbel, Cyflamid (EAMU 2007-0512), Kindred or Folicur on outdoor ornamentals but avoid applications on warm days to prevent unnecessary scorch damage.

Rooting Crops need to have rooted out well enough to get through the winter months to avoid damage from sudden sharp drops in temperature. Stimulate root growth using high-phosphate products including Hortifeeds 1:4:1, Hortiphyte, Peters Plant Starter, Solufeed 1:5:1 or Universol Yellow.

Rust Control persistent infections using Amistar (EAMU 2009-0443), Bumper 250EC (EAMU 2014-1274), Folicur, Plover (EAMU 2015-2673), Signum (EAMU 2012-2141) or Systhane 20EW.

Vine weevil Control eggs using parasitic nematodes now or drench ornamentals with Calypso (EAMUs required), Chess WG (EAMUs required) or Steward (EAMU 2008-2905).

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.



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