1 October - Bedding & biocontrol

Autumn bedding Watch for downy mildew on bedding, especially pansy and violas. Apply Fenomenal (EAMU 2013-1990), Invader (EAMU 2012-0109), Paraat (EAMU 2011-2585), Percos (EAMU 2013-0819), Revus (EAMUs required) or Signum (EAMU 2012-2141) where needed.

Biocontrol Gap-up plants under protection where predator applications are still being made and no clean-up sprays have been applied, to help predators move through crops effectively.

Frost Get vulnerable crops undercover now. Use horticultural fleece or Cosytex on outdoor frost-tolerant plants.

Weeds Apply products containing diquat, glufosinate-ammonium or Shark (EAMUs required) to knock back small annual broad-leaved weeds on non-crop areas. Tank mix Chikara and glyphosate to control vegetation on non-crop areas. Check the Chikara label for plant species that are also tolerant of soil applications.

Bacteria Prevent bacterial infections from overwintering using Serenade ASO (EAMUs required) on ornamental prunus species when temperatures allow, especially those for bare-root sales.

Botrytis Control active infections using Rovral WG (EAMU 2011-3200), Prestop, Serenade ASO (EAMUs required), Signum (EAMU 2012-2141) or Switch. Open doors and vents during the day and make sure crops have good airflow at pot level, especially evergreens.

Vine weevil larvae Continue with nematode applications using Nemasys L. Compost and soil temperatures need to stay above 5 degsC for effective control (see p50).

Powdery mildew This disease produces winter resting spores so use contact-acting, eradicant fungicides that are more effective now. Use food-grade potassium bicarbonate, Nimrod, Signum (EAMU 2012-2141), Switch or Takumi SC (EAMU 2013-1294).

Choisya Check watering at this time of year to avoid long periods of wet compost, which can lead to root rotting. Affected plants will show patchy dieback or sudden plant collapse. Drench affected plants, within their irrigation regime, with Fenomenal, Previcur Energy (EAMU 2011-1557) or Subdue. Introduce biologically active products including Prestop, T34 Biocontrol (EAMUs required) or Trianum P into the control programme to ring the changes.

Caterpillars Mop up pests using Decis (non-IPM, EAMU 2014-1011), Dimilin Flo, Hallmark WZT (non-IPM, EAMU 2008-2944), Insegar WG, Majestik, Pyrethrum 5EC, Spruzit, Steward (EAMU 2008-2905), Toppel 100 (non-IPM), Tracer (non-IPM, EAMU 2008-2908) or Runner (EAMUs required).

HorticultureWeek.co.uk/nursery.


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