8 August - Control grass weeds

Grass weeds Aramo (EAMU 2008-2813) can be used on many outdoor shrub, heather and herbaceous crops to control annual meadow grass.

It is effective on mature and flowering grass stages and will also control perennial grass weeds. Do not apply using a knapsack sprayer.

Powdery mildew Infection levels are still high in the dry weather.

Plant passporting Make sure your documents are up to date for any inspections over the next few months. See www.fera.defra.gov.uk/plants/plantHealth/plantPassporting.cfm for more details. For more information on the latest notifiable pests and diseases, see www.fera.defra.gov.uk/plants/plantHealth/pestsDiseases/index.cfm.

Heaters Get heaters serviced now ready for use in the late autumn.

Bark-boring beetles Adults lay eggs from July by boring small holes under joints or leaf axils. Eggs hatch and grubs bore into trees. Suppress adults by spraying Decis, Dursban WG or Hallmark WZT (EAMU 2008-2944) on stems of outdoor trees.

Pinus Check for weeping around buds, drooping stem leaders and stunted growth - a sign of pine shoot moth grub activity. Control larvae using Decis, Dursban WG or Toppel 100 (EAMU 2013-2410).

IPMP The Sustainable Use Directive requires growers to show they are using an IPM approach to control pests, diseases and weeds. A template integrated pest management plan (IPMP) is available via the VI website (www.voluntaryinitiative.org.uk/ipmp). It replaces the crop protection management plan.

Scab Monitor scab risk by using the Mills or Smith tables, which use the weather conditions to calculate optimum spraying times. Check Pyrus, sorbus, Crataegus, Malus, pyracantha and Chaenomeles.

Adult vine weevil Control adults' feeding by spraying Chess WG, products containing chlorpyrifos, Hallmark WZT (EAMU 2008-2944) or Steward onto foliage of vulnerable ornamentals during late afternoon. Adults feed at night and will forage in the insecticide solution.

Fruit Remove all fruit from saleable fruit trees unless an "edible" spray programme has been followed and all harvest intervals have been completed before despatch.

Iris Control iris corm borers, which cause Erwinia soft rot, using Calypso (EAMUs required), Decis, Dursban WG or Gazelle SG.

John Adlam, Managing director, Dove Associates

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