Caterpillars Predator-friendly products include Dimilin Flo, Dipel DF, Insegar WG and Runner (EoAs required). Other products available include Decis, Dursban WG, Hallmark WZT (EoA 2008-2944), Majestik, Pyrethrum 5EC, Spruzit, Steward, Toppel 100EC and Tracer (EoA 2008-2908).
Sucker insects Control on Buxus, Laurus, Pyrus and others with Calypso (EoAs required), Decis, Gazelle SG, Hallmark WZT (EoA 2008-2944), Pyrethrum 5EC, Savona or Spruzit. Extensions of Authorisations are required for some of these products on edible crops with application and harvest interval restrictions.
Rust Check birch, dianthus, heuchera, hypericum, mahonia, hollyhock, vinca, Salix, roses and other susceptible plants for rust. Infection usually starts as a light spot that appears on the upper side of leaves. Later infection shows small, sunken areas on the undersides of leaves followed by spores, which are sometimes quite bright in colour. Control with 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. Check labels and EoAs for approved uses.
Crane flies and vine weevil Control leatherjackets in liners and small pots of non-edible crops with drenches of Intercept 70WG, Dursban WG or Met52 as a mulch (EoA 2011-1997) on established ornamentals. For vine weevil larvae that have not reached pupa stage, nematodes such as Nemasys H (Fargro) or Larvanem (Koppert) can also be applied in compost temperatures above 12 degsC.
Eelworm Angular, brown patches on leaves that work their way up from the bottom of affected plants of weigela, philadelphus and buddleia can be a sign of eelworm feeding. Do not take cuttings from these plants. Applying Vydate 10G (EoA 1993-0020) will reduce pest levels but needs to be applied two week's before harvest. At least 12 hours must elapse before staff are allowed to go back into treated greenhouses.
Slugs and snails Control both of these pests (HW, 29 June) with Ferramol Max or Sluxx. After eating the pellet, slugs stop feeding and move away from the crop, which accounts for the lack of slime production. Foliage should be checked for a reduction in feeding damage because pests are not usually found nearby.
John Adlam, Managing director, Dove Associates