12 July - Fruit and vine weevil

Fruit - Remove all the fruit from fruit trees before despatch if a non-edible spray programme has been used this season.

Vine weevil Control feeding adults by spraying Chess WG (EAMUs required) or Steward (EAMU 2008-2905) during the day and Hallmark WZT (non-IPM, EAMU 2008-2944) during late afternoon onto the foliage of vulnerable ornamentals for effective control.

Western flower thrips Apply Macrocheles or Atheta to composts and Amblyseius cucumeris to foliage. Control large pest populations with rotations of Botanigard WP, Conserve, Dynamec, Movento (EAMU 2011-1987), Naturalis-L and Spruzit. Re-introduce predators seven-to-10 days after these applications but at the highest recommended introductory rate to compensate. Non-IPM products include Calypso (EAMUs required), Decis (EAMU 2014-1011), Hallmark WZT (EAMU 2008-2944) or Toppel 100.

Scale insects Adults and nymphs active now require control using short-term products including Chess WG (EAMUs required), Movento (EAMU 2011-1987), Spruzit, SB Plant Invigorator or Pyrethrum 5EC. Longer-term products include Decis (EAMU 2014-1011), Envidor (EAMU 2016-0997), Hallmark WZT (EAMU 2008-2944) or Toppel 100.

Mare’s tail Products containing 2,4-D, dicamba or MCPA will give good knock-down control but are safer applied to non-crop areas. Use a hooded sprayer near crops if products containing glufosinate-aluminium are used. With glyphosate, bruise the weed first for better uptake and control.

Hellebores Apply Cercobin WG (EAMUs and restrictions apply), Reflect (EAMU 2016-1602), Signum (EAMU 2012-2141) or Switch to control leaf spotting caused by Coniothyrium hellebori.

Iris Control iris corm borers, which cause Erwinia soft rot, using Calypso (EAMUs required), Decis (EAMU 2014-1011) or Gazelle SG.

Irrigation If aluminium irrigation pipes or irrigators in fields are laid where there are overhead power lines, get staff involved to read HSE leaflet GS6 for practical advice before starting.

Pear sucker Apply Decis (seven-day harvest interval), Envidor (14-day harvest interval) or Hallmark WZT (seven-day harvest interval). Complete all harvest intervals and other label restrictions prior to despatch. Sooty moulds can be controlled using Karma (one-day harvest interval).

Grass weeds To control annual meadow grass and some perennial grass weeds, apply Fusilade Max (EAMU 2012-1321) and Laser (EAMU 2017-0473) to a range of outdoor ornamental crops. The optimum time to apply is before weed tillering has started.

John Adlam, managing director, Dove Associates
HorticultureWeek.co.uk/nursery


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