17 March - Build your IPM plan

White blister - Control on Arabis, Alyssum, Aubretia, Erysimum and Hesperis using Amistar (EAMU 2009-0443), Folio Gold (EAMUs required), Fubol Gold WG (EAMU 2013-2288) or Signum (EAMU 2012-2141).

Servicing - Service and recalibrate all spray equipment including pressure gauges, measuring scales, jugs and syringes. Check for worn parts, leaky hoses, sticking gauges and blocked nozzles. Use the NSTS to test older equipment under the Sustainable Use Directive.

Downy mildew - Check for yellow patches - usually on young foliage - followed later on by grey fungal growth on leaf undersides. Protect crops using Bravo 500 (EAMU 2011-1130), Dithane 945 (EAMUs required), Karamate Dry Flo Neotec, Pergado Uni (EAMU 2012-1605) or Proplant (EAMU 2012-3100) on Buddleja, Cirsium, Digitalis, geum, hebe, impatiens, osteospermum, pansy, rose and others. Control any infections seen using Amistar (EAMU 2009-0443), Fenomenal (EAMU 2013-1990), Fubol Gold WG (EAMU 2013-2288), Invader (EAMU 2012-0109), Paraat (EAMU 2011-2585), Pergado Uni (EAMU 2012-1605), Signum (EAMU 2012-2141) or Valbon (EAMU 2014-2325). (see HW's Downy Mildew Factsheet).

Bedding - Disinfect production areas before sowing seed crops to reduce risks of early pest and disease attack.

Powdery mildew - Control using AQ10 (EAMUs required), food-grade potassium bicarbonate, Signum (EAMU 2012-2141) or Switch. Other products are available but will work much more effectively later on. Check protected grasses for this disease. (see HW's Powdery Mildew Factsheet)

IPM - Compile this year's integrated pest management plan to show evidence of compliance with the Sustainable Use Directive. Include biological controls plus products including DiPel DF, Naturalis-L, Prestop (EAMU 2015-2773), Serenade ASO (EAMUs required), Trianum and T34 Biocontrol (EAMU 2012-1118) and others. Other pesticides are predator-friendly but check labels and product data for their persistence on foliage and in composts.

Botrytis - Vent protected crops on warm, damp days. (see HW's Botrytis Factsheet)

Leaf spots - Protect foliage using Amistar (EAMU 2009-0443), Bravo 500 (EAMU 2011-1130), Octave, Rovral WG (EAMU 2011-3200) or Switch on ceanothus, hellebores, kniphofia, pansies, schizostylis, yucca and viburnum. (see HW's Fungal Leaf Spots Factsheet)

Mites - Check for overwintering mite eggs on vulnerable protected crops and on the stems and around buds of Fraxinus, Malus, poplar, Prunus, rhododendron, Salix, Sorbus aria and Tilia. Rust mites are more obvious on sunny days. If seen, control using Apollo 50SC (EAMU 2016-2082) or Hallmark WZT (non-IPM, EAMU 2008-2944).

HorticultureWeek.co.uk/nursery


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