5 August - Eelworm & spraying

Eelworm: Avoid taking cuttings from anemone, astrantia, bergenia, Brunnera, buddleia, cistus, helenium, heuchera, penstemon, philadelphus, phlox, pulmonaria, tiarella, tradescantia and weigela showing angular patches on lower leaves. Do not confuse this with downy mildew infections. Vydate 10G (EAMUs required) or Movento (EAMU 2011-1987) will help to reduce pest levels.

Spraying: Avoid spraying emulsifiable concentrates onto soft foliage before, during and after warm, sunny conditions to reduce the risk of scorch damage, which can delay plant sales.

Products include: Corbel, Decis, Dynamec, Nimrod and Sumi-Alpha.

Adding in an adjuvant to your spray tank (check pesticide labels first) will help to control stubborn powdery mildew infections on roses and trees. With unsettled weather, adjuvants will also help to increase the time products stay on crops.

Scab: Check pyrus, sorbus, Crataegus, Malus, pyracantha and Chaenomeles. Monitor scab risk by using either the Mills or Smith tables, which use the weather conditions to calculate optimum spraying times.

Moths: Check vulnerable crops including acer, ash, birch, choisya, Crataegus, euonymus, Malus, oak, prunus and others. Install a range of pheromone lures attached to Delta traps to identify damaging species for timely spray applications of DiPel DF.

Prochloraz: For ornamentals, Octave (MAPP 11741) and Scotts Octave (MAPP 15756) have an end use and storage date of 30 June 2017. Scotts Octave (MAPP 09275) had an end use date of 30 June 2016.

Fremontedendron: Apply Fenomenal (EAMU 2013-1990) or Subdue to plants to control aerial dieback on stems.

Pinus: Check for weeping around buds, drooping stem leaders and stunted growth - a sign of pine shoot moth grub activity. Control larvae using Decis or Toppel 100 (EAMU 2015-1454).

Feeding: Change to high-potash (K) products to harden up soft foliage and green-up any pale older leaves. Use products including Hortifeeds 2:1:6, Peters Plant Finisher, Sangral 1:1:3, Solufeed 1:0:3, Universol Violet or Vitax 2:1:4.

Spider mites: Masai, Dynamec and SB Plant Invigorator are useful products at this time of year. Use predators on vulnerable crops too, checking pesticide compatibility first. Naturalis-L will provide good knock-down control in tunnels and glasshouses with less than 60 per cent humidity.

John Adlam, Managing director, Dove Associates, HorticultureWeek.co.uk/nursery

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



These evergreen and deciduous shrubs feature bright foliage, corky bark and coloured fruit, says Miranda Kimberley.

Horticulture Week Business Award - Horticulture Week Most Admired Business Leader Award

Horticulture Week Business Award - Horticulture Week Most Admired Business Leader Award

Winner - Steve McCurdy, Majestic Trees

Horticulture Week Business Award - Best Business Refurbishment, Refit or Extension

Horticulture Week Business Award - Best Business Refurbishment, Refit or Extension

Winner Longacres Bybrook Barn, Longacres Garden Centres

Opinion... How to increase UK plant supply

Opinion... How to increase UK plant supply

Why don't UK growers produce more of the plants that the UK market demands?

Opinion... Co-operation is industry's best card

Opinion... Co-operation is industry's best card

What a great trade this is when one of us needs help. "The Container Revolution" co-operative exhibit at the RHS Chelsea Flower Show is a good example.

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.

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