White blister Check for white blister on Aubretia and Arabis. If you see white fluffy growth on the underside of the leaves, spray with Fubol Gold WG (SOLA 2003-2142), Aliette 80WG, Signum (SOLA 2004-1673) or Switch.
Aquilegia Watch out for very small, green caterpillars of the Aquilegia sawfly that can rapidly cause defoliation. If you see any foliar damage, spray outdoor crops with Toppel 100EC or indoor crops with Nemolt, SB Plant Invigorator or Majestik immediately. A delay of two days can be too late.
Midge Check Crataegus (particularly 'Paul's Scarlet') for the gall tip midge (Dasineura crataegi). Eggs are deposited in April/May and infected tips fail to grow normally with distorted rosette-like galls. Gazelle, Hallmark WZT (SOLA 2008-2944) or Dursban WG products give control.
Dull weather Watch for Botrytis on soft foliage and Rhizoctonia on bedding and cuttings. Check plants that may have been over-watered and maintain good air movement.
Lupins The seed-borne disease Colletotrichum produces tell-tale spiralling of foliage with darkened and fallen stems. Control as soon as it is seen with Cercobin WG (SOLA 2008-1384) or Switch.
Pearlwort Data on pre-emergence herbicides tested on container-grown nursery stock can be found in HDC Project HNS 139. Research suggests that the coarser the pot surface, the less germination of pearlwort occurs. Consider bark topdressing or use a coarse peat-growing media.
Vine weevil Vine weevil larvae are very active in untreated containers. Make sure you check all imported stock for them. If a non-edible crop is ready, drench with products containing Chlorpyrifos or Intercept 70WG. Low-temperature nematodes can be applied to saleable crops too.
Scale Control any mobile scale insects with Decis, Decis Protech or Stalwart (non-IPM); Savona, SB Plant Invigorator or Chess WG (SOLA 2008-2834) for IPM systems.
Growth regulators Don't forget to maintain your plant growth regulator applications on nursery stock subjects.
Climate Change Levy (CCL) Registering with the NFU can reduce your CCL tax bill and save energy within your business. The discount arrangements are in place until 2013 but you must register by the end of July.
Crown gall The HDC is keen to understand the extent of crown gall. Visit the Horticulture Week website and register your experience of it.