13 June: Mealybug & leaf spot

John Adlam looks at control options for mealybug, leaf spots, pine shoot moth, whitefly and more - and advises on irrigation.

Mealybug Control using predators including Cryptolaemus montrouzieri along with Leptomastix dactylopii (for citrus mealybug) and L. epona for vine mealybug. Anagyrus pseudococci will control citrus mealybug but will also attack vine mealybug. Control products include Decis (non-IPM, EAMU 2014-1011), Movento (EAMU 2011-1987), Pyrethrum 5EC, SB Plant Invigorator or Spruzit.

Leaf spots Maintain controls on astrantia, hellebores, pansies, phormium, roses and yucca. Products include Amistar (EAMUs required), Bravo 500 (EAMU 2011-1130), Rovral WG (EAMU 2011-3200), Octave, Serenade ASO (EAMUs required), Signum (EAMU 2012-2141)
and Switch.

Pine shoot moth Decis (EAMU 2014-1011) or Toppel 100 will help to disrupt egg-laying and larvae hatching.

Whitefly Control on ornamental crops using Chess WG (EAMUs required), Eradicoat, Mainman (EAMU 2013-0045), Majestik, Mycotal, Movento (EAMU 2011-1987), Naturalis-L or SB Plant Invigorator. For non-IPM situations, use Decis (EAMU 2014-1011), Gazelle SG, Hallmark WZT (EAMU 2008-2944), Pyrethrum 5EC, Spruzit or Toppel 100.

Lavenders Maintain shab and Botrytis controls, particularly in damp or humid conditions, with Octave, Serenade ASO (EAMUs required), Signum (EAMU 2012-2141) or Switch. Ensure good airflow around crops.

Aphids Increase Aphidius spp. on protected crops alongside selective insecticides such as Aphox (until 31 July 2017), Chess WG (EAMU 2013-2016), Majestik and SB Plant Invigorator. Large pest populations will require a spray before predator levels are increased.

Revocations Aphox has an end-use date of 31 July 2017. The new Toppel 100 product (MAPP 17071) only has an on-label approval for its use on outdoor ornamentals. Systhane 20EW (MAPP 09396 and MAPP 16837) has an end use date of 30 September 2017.

Powdery mildew Control using Amistar (EAMUs required), AQ10 (EAMU 2012-1324), Bumper 250EC (EAMU 2009-0707), Corbel, Cyflamid (EAMU 2007-0512), Folicur, Kindred, food-grade potassium bicarbonate, Nimrod, Signum (EAMU 2012-2141), Stroby WG, Systhane 20 EW or Takumi SC (EAMU 2013-1294).

Watering Check irrigation programmes daily to avoid wet compost. Boost root production on poorly established plants by using liquid feeds high in phosphate such as ICL’s Plant Starter, Solufeed 1:5:1, Universol Yellow or Hortimix 1:4:1. Use overhead irrigation later in the day to wash through salts that can build up on plants grown on sand beds.


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

Pest & Disease Factsheet - Peach leaf curl

Pest & Disease Factsheet - Peach leaf curl

Growers of fruit and ornamental trees need to be aware of this disfiguring disease.

Business planning - Demand management

Business planning - Demand management

Seasonal demand may be inevitable but peaks and troughs can be managed to minimise business impact, Neville Stein explains.

Crocus

Crocus

These heralds of spring are highly suited to being planted in tree circles, grass and rock gardens, says Miranda Kimberley.


Opinion... Get rid of plastics in Horticulture

Opinion... Get rid of plastics in Horticulture

Blue Planet II eloquently showed the rich tapestry of life in the oceans. It also focused public awareness on plastic pollution damaging wildlife.

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 among our politicians

Opinion... A wish list for unblinkered thinking among our politicians


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