Despatching plants: Leftover plants can act as a "sink" for transfer of infection onto new crops if left untreated. Include them in your control programmes. Frog hopper: " Cuckoo spit" produced by these pests is more cosmetic than damaging. Spray pests with Savona, SB Plant Invigorator or Chess...
Plant sap: Hot weather can cause allergic skin reactions from plants such as Euphorbia and Ruta. Remind staff and, as part of your health and safety policy, mark plants with a symbol to help staff who speak little English. Aphids: Continue using products such as Aphox, Chess WG, Majestik and SB...
White blister: Check Aubretia, Arabis and Lunaria - spray with Amistar (SOLA 2009-0443), Fubol Gold WG (SOLA 2010-2567) or Signum (SOLA 2009-1842) if you see the white fluffy growth on the underside of the leaves. Box blight: This disease is still active so spray Buxus subjects with Scotts Octave,...
Rust mites: These microscopic mites are active on Fraxinus, Malus, Poplar, Prunus, Rhododendron, Salix, Sorbus and Tilia. Spray with Dimilin Flo, Dursban WG, Envidor (SOLA 2009-3366), Hallmark WZT (SOLA 2008-2944) or Movento (SOLA 2011-1579). Use a lens to check stems and foliage. Dahlias: Watch...
Feeding: Include older plants in the liquid feeding programme (using a 2:1:1 product) or top-dressing programme. Cytisus, Hibiscus and Skimmia will benefit from added iron. Whitefly: Increase predator levels and shorten application intervals in line with pest numbers to achieve good control. Spraying...
Biological control Monitor introductions closely to make sure that they have released successfully and are providing effective control. Increase predator numbers each week to keep pest populations at manageable levels. Western flower thrip Introduce predators regularly or spray with Conserve,...
Midge and woolly aphid: Check susceptible species for woolly aphid as well as midge activity on Gleditsia, hawthorn midge and oak. Equity, Gazelle or Hallmark WZT (SOLA 2008-2944) will all work effectively. Apply the second application of Vydate 10G (SOLA 1993-0020) to seedling oaks to protect the...
Willow anthracnose: Small purplish spots are produced on leaves and shoots that enlarge causing leaf and twig death. Control with Amistar (SOLA 2009-0443), Signum (SOLA 2009-1842) or Switch. Apply at bud break and through the summer if it is hot and dry. Salix matsudana 'Pendula' is reported to be...
Western flower thrip: Check for the tell-tale scratching on the foliage of bedding plants, roses, fuchsia and clematis. Blue sticky traps and lures can help to monitor susceptible crops. Under protection, use Amblyseius spp. if temperatures are stable. Control pupae with Hypoaspis or Macrocheles mites...
Green manures: Order seed now for planting at the end of this month. The Caliente mustard range from Plant Solutions will increase soil organic matter levels and also provide additional biofumigation benefits. Green manures need to be managed like any other field crop. Sclerotinia: Often attacking...
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