From the nursery

Spider mites Spider mites are already active on some outdoor crops so map out a strategy of chemical rotation for spider mite control to avoid resistance. Protected crops have a choice of Borneo (2008-1216), Dynamec, Gyro, Hallmark WZT (2008-2944), Masai, Majestik, SB Plant Invigorator and Sequel (2007-0902). Majestik and SB Plant Invigorator are fully compatible with biological control once they have dried on the plant. IPM spider mite programmes should also be started now. Make sure you have plant-to-plant foliage touching for good predator dispersal. The use of white fleece over non-touching plants can provide a useful predator pathway.

Powdery mildew Research work carried out on Azalea powdery mildew showed that it can develop at much lower temperatures than other mildew species. Check on deciduous Azalea foliage as it emerges for signs of the white growth. Start a spray programme using contact products such as Nimrod or potassium bicarbonate and use a protectant product seven days later. Check the foliage of miniature roses too. Products also available include Amistar (2009-0443), Bumper 250EC (2009-0707), Stroby WG, Systhane 20EW for protected crops and Cyflamid (2007-0512) or Folicur for extended control on outdoor crops.

Western flower thrip larva on foliage As soon as the air temperature starts to rise we can expect the activity of western flower thrip larva on foliage to become more obvious. The tell-tale scratching of the foliage can quickly ruin a perfect plant ready for dispatch. Control with Conserve or predators as soon as seen.

Leaf hopper on foliage The other pest that can cause leaf surface scratching is leaf hopper. These small and very frisky pests tend to be seen on sage, Lamium, Chrysanthemum and bedding plants. Control with applications of systemic products such as Chess WG (2008-2834) or Intercept 70WG, or contact products like Decis, Stalwart and Toppel 100 EC (non-IPM) or Majestik. Systemic granular products incorporated into compost also have some effect.

Blossom/bud wilt Check for dead buds on Malus and spray with Cercobin WG (2008-1384) to control Botrytis infections of opening buds.

Growth regulators The second application of growth regulator should be applied now on nursery stock. Low-dose and repeated applications work far more effectively on shrub subjects.

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



Masses of colourful tubular flowers can give these plants a substantial presence in the border, says Miranda Kimberley.

Tomorrow's tractors

Tomorrow's tractors

These machines have advanced rapidly over recent years but what does the future hold? Sally Drury looks ahead.

Climbing roses

Climbing roses

Walls, trellises, pergolas and even trees can all be brightened up by these beautiful blooms, writes Miranda Kimberley.

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.

Editorial ... More analysis and insight from bumper HW issue

Editorial ... More analysis and insight from bumper HW issue

Welcome to this bumper 72-page July edition of Horticulture Week magazine, packed with exclusive analysis, insight and expert advice on the biggest issues impacting all sectors of the UK horticulture industry right now.

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