8 July - Weevils and weeds

Adult vine weevil - Control feeding adults by spraying Chess WG or Steward during the day and apply Hallmark WZT (EAMU 2008-2944) during late afternoon onto foliage of vulnerable ornamentals for an effective control. Note that Hallmark WZT is not IPM-friendly.

Grass - For the control of annual meadow grass and some perennial grass weeds, apply Aramo (EAMU 2015-0454) on a range of outdoor shrub, heather and herbaceous crops. The optimum time for application is before the tillering of the weeds has started.

Bark-boring beetles - Adults lay eggs from July by boring small holes under joints or leaf axils. Eggs hatch and grubs bore into the tree. Suppress adult activity by spraying Decis, Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2015-1454) on stems of outdoor-grown trees.

Mare's tail - Products containing amitrole, dicamba or MCPA will give good knock-down control but are safer applied to non-crop areas. With products containing glufosinate-aluminium, use a hooded sprayer near crops. Bruise the weed first, if glyphosate is used, for better uptake and control.

Sucker insects - Apply Decis, Dimilin Flo, Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2015-1454) if seen on ornamental crops. Control sooty moulds on ornamental crops using Octave or Rovral WG (EAMU 2011-3200).

Hellebores - Apply Cercobin WG (EAMUs and restrictions apply), Octave, Signum (EAMU 2012-2141) or Switch to control leaf spotting caused by Coniothyrium hellebori.

Flea beetles - Apply Chess WG (EAMU 2013-2016), Calypso (EAMUs required), Decis (non-IPM, EAMU 2014-1011), Majestik, SB Plant Invigorator, Hallmark WZT (non-IPM, EAMU 2008-2944), Pyrethrum 5EC or Spruzit to Crambe, fuchsia, wallflowers and others. Weed hosts are willowherb and bittercress.

Red bud mite - Ensure ties are tight during tree budding to prevent mites entering behind buds.

Irrigation - If aluminium irrigation pipes or irrigators in fields are laid where there are overhead power lines, get staff involved to read the fourth edition of Health & Safety Executive leaflet GS6 for practical advice before starting.

Leaf miner - Maintain preventive sprays on young Aesculus spp. using Gazelle SG, dimethoate or Hallmark WZT (EAMU 2008-2944). Pests attack the white varieties more than the reds.

HorticultureWeek.co.uk/nursery


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