17 August - Combat leaf miner

Leaf miners: Protect white-flowering horse chestnut specimen trees with sprays of Calypso (EoAs required) or Danadim Progress.

Dynamec can also be used but is UV-sensitive. IPM-friendly products include Dimilin Flo. A stem injection of Admire (EoA 2008-0298) can be used in amenity situations.

Phytophthora: Apply Aliette 80WG, Fenomenal or Standon Fullstop to Fremontodendron and ilex to control stem infections from wounding or on outdoor crops affected by wet weather.

Rust: Control active infections using Amistar (EoA 2009-0443), Bumper 250EC (EoAs required), Cuprokylt, Difcor 250EC (EoAs required), Fandango (EoA 2009-0226), Folicur, Nimrod, Plover (EoAs required), Signum (EoA 2009-1842), Thianosan DG or Systhane 20EW checking the labels and EoAs for restrictions. Control weed hosts such as willowherb and groundsel.

Botrytis: Check closely spaced crops with dense foliage. Improve air flow and spray with Amistar (EoA 2009-0443), Octave, Rovral WG (EoAs required), Scala (EoA 2011-1315), Serenade ASO (EoAs required), Signum (EoA 2009-1842) or Switch.

Thrips: Blue traps plus pheromone lures will help to draw pests out. Products include Calypso (EoAs required), Conserve, Dynamec, Naturalis-L, Pyrethrum 5EC, Savona or Spruzit. Re-introduce predators (Amblyseius cucumeris and Macrocheles robustulus) two weeks after pesticide applications.

Spider mites: Check Picea abies and recently cutback buddleia, choisya, Crinodendron, dahlia, fuchsia, hydrangea, roses and Sambucus. Maintain controls with Phytoseiulus and in higher temperatures Amblyseius andersoni, A. californicus and A. swirskii. Borneo (EoA 2008-1216) is effective in warm conditions on nymphs and larvae and inhibits egg development, persisting for up to two months. Short-term acaricides include Dynamec (avoid sunny conditions); Eradicoat (protected crops in high humidity); Masai; Majestik; Naturalis-L (60 per cent humidity); Pyrethrum 5EC; SB Plant Invigorator or Spruzit. Longer-term products include Hallmark WZT (EoA 2008-2944, non-IPM); Oberon (EoA 2004-1718, not on Cordyline) or Sequel (EoA 2009-3061).

Grass weed control: Aramo (EoA 2008-2813) can be used over a wide range of outdoor shrub, heather and herbaceous subjects to control annual meadow grass even at a mature, flowering stage.

John Adlam, Managing director, Dove Associates


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