6 April - Hold off spraying ahead of a frost

Frost and spraying: Take care with warm days and cold nights - only spray when there is no risk of frost on the following day. Products that contain adjuvants will enhance uptake and increase efficacy but can leave soft foliage without adequate cuticle. This vulnerable foliage may be damaged even in a mild frost.

Glasshouse computers: Set up a routine to check temperatures, humidity levels, vents and screens to get the most out of your protected structures. Change the timing in line with variations in weather conditions.

Sticky traps: Check weekly to monitor pest levels and change often, especially if under propagation polythene tents.

Fenomenal: This product containing fenamidone and fosetyl-aluminium is now available as a drench application against Pythium and Phytophthora spp. in fieldand container-grown ornamentals and bulbs.

Spraying: Include short-term knockdown products such as Pyrethrum 5EC in your spray programme. It has good action against aphids, thrips, flea beetles and caterpillars because of the addition of piperonyl butoxide, which improves its activity on pests. The majority of biological controls can be re-introduced after seven days.

SPS forms: Register or fill in your IACS and SPS forms by 15 May. See http://rpa.defra.gov.uk/rpa/index.nsf/home for further guidance and forms.

Weed control: Control perennial weeds such as thistles, docks and nettles on newly acquired land before planting, spot-treating with clopyralid, glyphosate or triclopyr. Control volunteer cereals and couch grass later with Aramo (EoA 2008-2813), Laser, Falcon or Panarex (EoA 2006-0364).

Rust: Check heuchera and fuchsia leaves and stems, and spray with Amistar (EoA 2009-0443), Bumper 250EC (EoA 2009-0707), Nimrod, Signum (EoA 2009-1842), Systhane 20EW or Topas.

Bark beetles: Pests will emerge as the weather starts to warm up. Spray the stems of pines and ornamental prunus with Dursban WG.

Wetting agents: Consider using Headland Rhino, Silwet L-77, Slither or Slippa for better foliar coverage and to improve product efficacy. Some products such as Amistar or those that are emulsifiable concentrates should not have these products added to the spray tank because of scorch risk.

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

Business planning - Planning for uncertainty

Business planning - Planning for uncertainty

Planning, organisation and discipline are all areas where horticulture firms can take lessons from the military, says Neville Stein.



These useful plants are persistent, need little attention and offer striking colour combinations, says Miranda Kimberley.

Protected Cropping Structures - Polytunnels

Protected Cropping Structures - Polytunnels

Cost factors, ventilation benefits and the ability to fit new advanced films are some of the reasons behind the popularity of these structures, says Sally Drury.

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