29 May - Check for root rot

Thielaviopsis (black root rot) - Check for patchy black damage on roots plus black lesions at the base of stems alongside leaf yellowing. Drench with Cercobin WG (EAMUs required), Octave or spray Switch and prevent infections using Prestop (EAMU 2012-0564), Trianum P or Serenade ASO (EAMUs required).

Powdery mildew - Spray Amistar (EAMU 2009-0443), AQ10 (EAMU 2012-1324), Bumper 250EC (EAMU 2014-1274), Corbel (not on roses), Cyflamid (EAMU 2007-0512), Folicur, Kindred, food-grade potassium bicarbonate, Nimrod, Signum (EAMU 2012-2141), Stroby WG, Systhane 20EW or Takumi SC (EAMU 2013-1294) depending on crop situations.

Scab - Check ornamental Malus, Chaenomeles, Crataegus and pyracantha. Apply Captan 80WDG (EAMU 2014-2510, nursery fruit trees only), Karamate Dry Flo Neotec, Scala (EAMU 2011-1315), Systhane 20EW or Topas.

Willow anthracnose - Apply Amistar (EAMU 2009-0443), Folicur, Signum (EAMU 2012-2141) or Switch through the spring and summer to prevent stem dieback and large unsightly cankers.

Woolly aphid - Control on outdoor Fagus, Malus and pines using Calypso (EAMUs required), Chess WG, Dursban WG (non-IPM), Gazelle SG, Hallmark WZT (EAMU 2008-2944) or Movento (EAMU 2011-1987).

Scale insects - Control on Aesculus, camellia, Laurus nobilis, Hedera, Ribes and Taxus with Chess WG (EAMU 2013-2016), Decis (non-IPM), Hallmark WZT (non-IPM, 2008-2944), Pyrethrum 5EC, Savona, SB Plant Invigorator or Spruzit.

Sawfly - Aquilegia, robinia, older roses, Tilia and others are susceptible. Check for small green caterpillars that defoliate plants. Spray outdoor crops with Decis or Tracer (EAMU 2008-2908) and indoor crops with Dimilin Flo or Pyrethrum 5EC.

Pythium & Phytophthora spp. - Avoid overwatering vulnerable plants - Chamaecyparis, Cytisus and Taxus. Control active infections using Fenomenal or Subdue. Re-populate composts with beneficial micro-organisms using Prestop (EAMU 2012-0564), Serenade ASO (EAMUs required) or Trianum P.

Fireblight - Check Rosaceae subjects, especially ones that bore flowers last year. Prune and burn all suspect plant material. Cold damage and old scab infections bring similar symptoms.

Mulches - Apply bark mulch to compost surfaces ensuring good coverage to retain moisture and prevent weed infestation. Coir mats, polythene slips, grit and shredded Miscanthus are also available in varying quantities.

HorticultureWeek.co.uk/nursery.


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