2 April - aphids and infections

Aphids With pest numbers rising, particularly on protected crops, control them using predators alongside Chess WG (EAMUs required), Eradicoat, Majestik, Movento (EAMUs required), Naturalis-L, Pyrethrum 5EC, SB Plant Invigorator or Spruzit.

Bacterial infections Apply Captan 80WDG (EAMUs required) or Serenade ASO (EAMUs required) plus a wetting agent to foliage where appropriate. Avoid applying overhead irrigation in the late afternoon on vulnerable prunus spp. to avoid long periods of wet foliage overnight.

Iprodione Products containing this active ingredient have an end-use date of 5 June 2018.

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

Whitefly Introduce Encarsia and Eretmocerus when the "scale" stage is present. Hang cards away from sun and direct irrigation. Apply Chess WG (EAMUs required), Eradicoat, Majestik, Mainman (EAMU 2013-0045), Movento (EAMUs required), Mycotal, Naturalis-L, Pyrethrum 5EC, SB Plant Invigorator and Spruzit.

Blossom wilt Check cherries, plums, damsons and apricots. If the disease is present, cut back to good wood and then apply Signum (EAMU 2010-2109) or Switch (EAMU 2010-3092).

Crinkling Differences in day and night temperatures can cause leaf crinkle. Aucuba, prunus and some herbaceous are more prone because they are leafy. Ventilate during warm days and apply fleece or Cosytex to vulnerable crops.

Flea beetles Control damage on Crambe, fuchsia, wallflowers and others using Chess WG (EAMUs required), Calypso (EAMUs required), Decis (non-IPM, EAMU 2014-1011), Majestik, SB Plant Invigorator, Hallmark WZT (non-IPM, EAMU 2008-2944), Pyrethrum 5EC or Spruzit.

Disease control Check for lavender shab (Phoma) and Botrytis on protected crops including paeonies. Include any plants that have been previously damaged in a cold spell using Rovral WG (EAMU 2018-0241), Signum (EAMU 2012-2141) or Switch.

Eelworm Apply Movento (EAMUs required) to abelia, anemone, Brunnera, buddleia, hellebores and weigela crops now to control leaf and stem nematodes that overwintered from last year. Trial on a small number of plants first to check for phytotoxicity.

Movento Phytotoxic effects have been seen on alstroemeria, begonia, cyclamen, euphorbia, ficus, fuchsia, Hedera, hydrangea, impatiens, pelargonium, Populus, Salix, saintpaulia, Tilia and Quercus frainetto.

JOHN ADLAM Managing director, Dove Associates
HorticultureWeek.co.uk/nursery


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