14 April - Weevils and capsids

Vine weevil Maintain close checks and apply Steinernema kraussei (Nemasys L) to control larvae. Control adult pests using Chess WG (EAMUs required), Hallmark WZT (non-IPM, EAMU 2008-2944) or Steward (EAMU 2008-2905), applied late afternoon for maximum control effect.

Capsids, midges, leafhoppers Apply Calypso (EAMUs required) Decis (non-IPM, EAMU 2014-1011), Hallmark WZT (non-IPM, EAMU 2008-2944), Pyrethrum 5EC, Spruzit or Toppel 100 (non-IPM) if holes or flecking — depending on the pest — are found on new growth on ornamentals. Monitor Buxus, Caryopteris, choisya, dahlia, forsythia, hydrangea, Pyrus, Quercus and roses.

Feeding Check ceanothus, cytisus and potentilla that are looking pale at this time of year. Kick-start their saleability by watering composts with an iron chelate EDDHA at the rate of 100g per 10 litres of water diluted at 1:200. EDTA chelates do not work so well as a drench.

Ribes blister aphid Currently active on crops — control now before pest feeding causes leaf distortion, blistering and discolouration of foliage. Control with Decis (non IPM, EAMU 2014-1011), Hallmark WZT (non-IPM, EAMU 2008-2944), Spruzit or Pyrethrum 5EC.

Needle cast Preventive applications of Bravo 500 (EAMU 2011-1130), Signum (EAMU 2012-2141) or Switch will control the spread of needle cast diseases that cause brown fronds. Good airflow around foliage will reduce the high humidity conditions that contribute to disease spread.

Mites Apollo 50SC (EAMU 2016-2082) is a useful product to apply now as a clean-up on outdoor crops. Both Apollo 50SC ornamentals EAMUs (including EAMU 2015-2102) have a 35-day harvest interval. For protected crops, use predators now in conjunction with Dynamec, Majestik, Naturalis-L and SB Plant Invigorator. Delay your Borneo (EAMU 2008-1216) and Masai applications until the summer months for greater effect. Some of these products will temporarily affect predator populations.

Masai This useful summer-applied acaricide has an end-sales date of 30 June 2018. The end-use date is 30 June 2019. Make sure you have enough product for use in 2019. The new MAPP number 18287 does not have an ornamentals on- or off-label approval.

Scab Use products that provide protectant and eradicant properties including Amistar (EAMUs required), Captan WDG (EAMUs required), Dithianon WG, Karamate Dry Flo Neotec, Scala, Signum (EAMUs required), Stroby WG or Topas (EAMU 2015-2338). Assume an "edible" spray programme where possible.


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

Sophora

Sophora

A graceful habit, attractive foliage and often fragrant flowers are all selling points, writes Miranda Kimberley.

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.

Kniphofia

Kniphofia

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