From the nursery

Aphids - These pests are still alive on some protected crops and acers. Control at this time of the year can often be effective by the use of smokes or fogging as it reduces the amount of water you apply to the crop. Smokes available include Fumite Pirimiphos Methyl Smoke (approval ends September 2009) or Nicotine 40% Shreds. If you spray, you can use Chess WG, Decis, Majestik, SB Plant Invigorator or Stalwart.

Fleece - Covering plants at night with white fleece is superior to polythene for frost protection. There are several grades of fleece available so choose one with adequate thickness for your requirements.

Whitefly - Control any active adults outside with applications of Hallmark WZT, Toppel 10 or Decis and Gyro, Majestik or SB Plant Invigorator on protected crops. Don't use Gyro after January if you intend to introduce IPM next season. Outside, make sure you avoid spraying just before a frost to prevent foliage damage.

Heaters - At this time of year growers call me to report leaf scorch on heated crops under protection. Ensure that if you are using a paraffin (28 sec) heater that is direct fired (where the flame goes straight into the structure and not through a chimney) and that you only use premium grade paraffin with low sulphur content. This is particularly important if we have snow or the tunnels are shut up for extended periods.

Weed control - Use the milder days to spray diquat (eg Reglone), glufosinate-ammonium (eg Harvest) or carfentrazone-ethyl (Shark) over dormant herbaceous perennials. This will kill off the leftover weeds from last season and give you a clean start to the season. The application of the residual herbicides to field-grown crops such as Devrinol, Stomp 400 SC, Flexidor 125, Kerb formulations or Butisan S can be carried out on suitable spraying days. Avoid spraying residual herbicides during periods of heavy rainfall.

Powdery mildew - Some protected crops are still being affected by this disease. Consider food-grade potassium bicarbonate or Stroby WG for effective control at this time of year.

Botrytis - Check that the ventilation fans are all running in tunnels and glasshouses; this is one of the most important times for them to be fully operational. Open the doors of your tunnels at least once a day for a short period to change the air and control the humidity.

John Adlam is managing director of Dove Associates


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