15 April - Beetles and mildew

Bark beetles: Apply Decis, Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2015-1454) directly onto stems of pines, cherries and other vulnerable crops to control emerging bark beetles.

Powdery mildew: Check emerging deciduous azalea foliage for early powdery mildew infections. Apply food-grade potassium bicarbonate, Nimrod or Signum (EAMU 2012-2141) followed by Systhane 20EW.

Capsids, midges & leafhoppers: Spray Calypso (EAMUs required) Decis, Envidor (EAMU 2012-0254), Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2015-1454) if holes or flecking (depending on the pest) are found on new growth. Chess WG (EAMU 2013-2016) will also prevent damage to buds and young leaves of Buxus, Caryopteris, choisya, dahlia, forsythia, hydrangea, Pyrus, Quercus and roses.

Bacteria: Avoid overhead irrigation in late afternoon on vulnerable Prunus spp. Apply Cuprokylt (EAMU 2015-1176), Serenade ASO (EAMUs required) plus a wetting agent and try to leave foliage dry for at least 24 hours after spraying.

Blossom wilt: Check cherries, plums, damsons and apricots. Apply Systhane 20EW (EAMUs required) to prevent infections and, should the disease be present, control with Indar 5EW (EAMU 2003-1372), Signum (EAMU 2010-2109) or Switch (EAMU 2010-3092).

Whitefly: Introduce Encarsia and Eretmocerus when the "scale" stage is present. Hang cards away from sun and direct irrigation. Alternatively, apply Chess WG (EAMU 2013-2016), Majestik, Mainman (EAMU 2013-0045) Naturalis-L, Pyrethrum 5EC, Savona and SB Plant Invigorator. For non-IPM systems include Decis, Gazelle SG, Spruzit or Toppel 100 (EAMU 2015-1454).

Box blight: Apply Octave, Signum (EAMU 2012-2141) or Switch to Buxus. Only prune plants in mild, dry conditions. Use sharp tools and disinfect blades in between batches of plants.

Leaf miners: Introduce Dacnusa and Diglyphus wasps or apply Calypso (non-IPM, EAMUs required), Conserve, Dynamec or Hallmark WZT (non-IPM, EAMU 2008-2944). Selected pheromone traps are also available.

Weeds: Spot treat outdoor perennial weeds using Depitox (EAMU 2008-2843), Dow Shield 400 (EAMUs required) or glyphosate products. Control grasses using Aramo (EAMU 2015-0454), Falcon or Laser.

EAMUs: Go to the Chemicals Regulation Directorate website (https://secure.pesticides.gov.uk/offlabels) to check on newly issued EAMUs since the beginning of this year. Some have been updated to reflect new end-use dates.

John Adlam, Managing director, 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

Pest & Disease Factsheet - White mould

Pest & Disease Factsheet - White mould

Sclerotinia sclerotiorum, S. minor and S. trifoliorum particularly affecting legumes such as green, broad and faba beans.

Biocontrols - market growing rapidly as regulations tighten

Biocontrols - market growing rapidly as regulations tighten

Manufacturers are developing new biological pest controls for growers facing more stringent regulations and customer demands, Gavin McEwan reports.

Weed control - latest chemical and non-chemical options for the production sector

Weed control - latest chemical and non-chemical options for the production sector

We understand that weeds are just plants growing in the wrong place but they mean so much more to growers.