From the nursery

Scale insects - Scale insects still remain mobile so if seen they can be sprayed with Chess WG at the higher off-label approval rate or SB Plant Invigorator for plants awaiting sale in the garden centre and all edible crops. Look at yew and bay trees, which seem to be most affected.

Leaf miners - Leaf miner can be found on some crops, particularly herbaceous perennials. Spray with Dynamec, Decis or Toppel 10 if seen.

Ceanothus and Viburnum - While I mentioned this last month, it is one of those problems that need repeated attention. These two subjects are being damaged by Phoma spp., which causes branches or tips to die back. Ensure a regular spray of either Scotts Octave or Signum to control the spread of the disease. In the case of Viburnum, do not trim the plants any later than July or you will remove the flower buds that are just starting to develop.

Left-over plants - Drench old/unsold plants that haven't had any vine- weevil control in the compost in September with Intercept 70WG or nematodes. Egg laying will occur any time now and the larvae start developing around six weeks after that.

Ash leaf gall - A reddish colour and leaf edge curl are symptoms of ash leaf gall sucker. Spray with Gyro or Hallmark with Zeon Technology if the symptoms start to show up. Use a wetting agent to get good pesticide penetration.

Escallonia - Don't forget to spray the foliage in July and August with a magnesium chelate such as Librel Liquid Mg. This will avoid the yellow lower leaves often seen on these plants mid-summer. They can be added to most pesticide sprays as a tank mix.

Pest and disease resistance - Resistance to pesticides by both pests and diseases does occur but there are a few simple rules that you can carry out to delay this natural process. Try to use a different pesticide group in rotation in your pest and disease control programmes. The UK Pesticide Guide (now online) is a valuable source of information on this subject and lists the product group under the active ingredient name. Check out your aphid, spider mite and whitefly programmes as these are the pests that seem to gain resistance more frequently. Botrytis, Septoria and downy mildew have also shown resistance to some fungicides and need care in the programme planning.


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

Dazzling display of new plants at Four Oaks Trade Show 2017

Dazzling display of new plants at Four Oaks Trade Show 2017

A wide range of first-time exhibitors and established names will showcase a wealth of new varieties at September's Four Oaks Trade Show, says Matthew Appleby.

Product and service showcase

Product and service showcase

Fresh solutions to production problems can be found among the array of products and services being introduced at the Four Oaks Trade Show, Sally Drury reports.

Four Oaks Trade Show 2017 - Exhibitor List

Comprehensive list of the exhibitors at this year's show and where to find them.


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.

Edwards: Will a weak pound and tariffs on imported stock be good for UK nursery production?

Edwards: Will a weak pound and tariffs on imported stock be good for UK nursery production?

At the time of writing - a few days after the general election - sterling has weakened and we still have no idea of what Brexit means.


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