2 September - Pansies and mildew

Pansies: After transplanting, get plant growth regulator and downy mildew control programmes up and running.

Powdery mildew: Include Corbel, Cyflamid (EAMU 2007-0512), Kindred or Folicur on outdoor ornamentals, avoiding applications on warm days. Add in a wetting agent to fungicides (check labels and EAMUs) to help further control persistent infections.

Mites: Apply Envidor (EAMU 2016-0997) or Movento (EAMU 2011-1987) to control late-summer rust and spider mite populations before they overwinter. Apply one of these products to Alnus and Tilia, which can also suffer from a number of different damaging mites.

Rust: Control using Amistar (EAMU 2009-0443), Bumper 250EC (EAMU 2014-1274), Folicur, Plover (EAMU 2015-2673), Signum (EAMU 2012-2141) or Systhane 20EW.

Scale insects: Control the "crawler" stages on acer, cornus, ilex, magnolia and others before egg-laying occurs. Use Decis (non-IPM, EAMU 2014-1011), Envidor (EAMUs required), Majestik, Pyrethrum 5EC, Savona, SB Plant Invigorator or Spruzit.

Needle cast: Prevent this disease taking hold before the winter months using Bravo 500 (EAMU 2011-1130), Octave, Serenade ASO (EAMUs required), Signum (EAMU 2012-2141) or Switch.

Root aphid: Control in ornamental ribes and pines with drenches of Calypso (EAMU 2014-2153) or Movento (EAMU 2011-1987). Maintain moist compost for effective control.

Stem cankers: Avoid lifting vulnerable trees in leaf. Apply Synthron EDTA Cu 9.1 per cent two weeks before lifting. Use a transport system that keeps stem damage to a minimum to reduce infection risks and always keep root systems moist.

Soil sterilisation: Basamid can still be used while soils are moist and soil temperatures are warm. Cover treated soil with polythene prior to planting preparations.

Thrips: Renew pheromone lures and blue sticky traps. Use yellow traps on dull days.

Rooting out: Ensure that crops have rooted out well enough to get through the winter months to avoid root rotting and damage from sudden sharp drops in temperature. Stimulate root growth using high-phosphate products such as Hortifeeds 1:4:1, Hortiphyte, Peters Plant Starter, Solufeed 1:5:1 or Universol Yellow.

Pruning: Avoid trimming plants that flower through the late autumn/early winter such as Cornus mas, Callicarpa, Hamamelis, Lonicera 'Winter Beauty', Mahonia, Skimmia and Viburnum tinus.

John Adlam, Managing director, Dove Associates

HorticultureWeek.co.uk/nursery


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