10 June - Mites and insects

Spider mites - These pests are extremely active on vulnerable crops right now. Control using Dynamec, Hallmark WZT (non-IPM, EAMU 2008-2944), Naturalis-L, Oberon (EAMU 2004-1718), Savona or SB Plant Invigorator. Some of the less harmful products may still cause some temporary damage to sensitive predators such as Phytoseiulus persimilis.

Scale insects - Control on Aesculus, Camellia, Cercis, Laurus nobilis, Hedera, Ribes and Taxus with Chess WG (EAMU 2013-2016), Decis (non-IPM, EAMU 2014-1011), Hallmark WZT (non-IPM, 2008-2944), Pyrethrum 5EC, Savona, SB Plant Invigorator or Spruzit.

Willow anthracnose - Apply Amistar (EAMU 2009-0443), Folicur, Signum (EAMU 2012-2141) or Switch now to prevent potential stem and leaf damage, stem dieback and the formation of cankers.

Spraying - If dilute washings are sprayed back over crops, make sure that the maximum product dose is not exceeded. If washings are applied onto non-crop land, then an environmental permit is required.

Woolly aphid - Maintain a tight spray programme for successful control on outdoor Fagus, Malus and pines using Calypso (EAMUs required), Chess WG, Gazelle SG, Hallmark WZT (non-IPM, EAMU 2008-2944) or Movento (EAMU 2011-1987).

Rust - Check campanula, fuchsia, hollyhocks, hypericum, iris, mahonia, mentha, rose and vinca. Protect foliage using Systhane 20EW. Amistar (EAMU 2009-0443), Bumper 250EC (EAMU 2009-0707) or Signum (EAMU 2012-2141) will control infections. Products in FRAC group 3 can produce unwanted growth regulant effects, especially on sensitive crops including fuchsia.

Cultural work - Shade eucalyptus growing under protection to prevent oedema - corky patches on leaves - in warm, humid conditions. Apply anti-transpirants (such as Wiltpruf S600) to newly potted crops to help prevent moisture loss and wind damage. Check irrigation programmes on a daily basis to make sure that they are appropriate to the weather conditions and irrigate during cooler periods of the day to avoid leaf scorch on soft foliage. Reduce controlled-release fertiliser amounts by 10 per cent too, to avoid root damage this summer.

Adelgids - Control these woolly aphid-like pests using Decis or Hallmark WZT (non-IPM, EAMU 2008-2944) plus a wetting agent (as appropriate) for good foliage penetration. Nymphs form pineapple-shaped galls - in which they develop - on Abies, juniper, larch, Picea, pine and Pseudotsuga. Galls are usually larger on young, strong shoots.


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