Seasonal advice
Nursery notes with John Adlam Expert advice on maintaining and presenting your plants in June
Top tips for June
l Warm, dry periods will encourage spider mite numbers. Control with combinations of predators and sprays.
l Ash leaf sucker feeding causes leaf edge curling and purple discoloration; check for 3mm-long bluish-green insects. If seen, spray with Decis, Dursban WG or Hallmark WZT (EoA 2008-2944).
l Irrigate during cooler periods of the day to avoid leaf scorch on soft foliage. l Reduce CRF amounts by10%on newly potted short-term crops to avoid root damage this summer.
l Watch for ring spot virus (distinctive yellow spots with dark centres) on Dahlias spread by aphids.
l Shade eucalyptus growing under protection to prevent oedema–corky patches on leaves – in warm, humid conditions.
…for the grower In the field and in containers
4Capsid bugs Bright green insects feed by piercing holes on buds and young leaves of Caryopteris, Choisya, Dahlia, Forsythia, Hydrangea and roses. Control with Calypso (EAMUs required), Decis, Dursban WG, Hallmark WZT (EAMU 2008-2944) or Toppel 100. Weed hosts include dandelions, dead-nettles, mayweeds and bindweeds.
4Caterpillars Control with Conserve, Dimilin Flo, Dipel DF, Insegar WG, Pyrethrum 5EC, Runner (EAMUs required), Steward (EAMU 2008-2905), Toppel 100 or Tracer (EAMU 2008-2908). Pheromone traps can help with timely insecticide applications.
4Chrysanthemum white rust White, cream, brown or pink pustules can be seen on leaf undersides along with yellow blotching on the top surface. Keep leaves dry to reduce humidity and infection potential. Apply Amistar (EAMU 2001-1684) or Bumper 250EC (EAMU 2009-0707) if seen.
28 HTAnewsI June 2013 I
www.the-hta.org.uk
Protect plants using Karamate Dry Flo Neotec or Thianosan DG.
4Flea beetles Pests create pin-prick holes in foliage on Crambe, Fuchsia, wallflowers and others. Control with ChessWG(EAMU 2008-2834), Calypso (EAMUs required), Decis, Majestik, SB Plant Invigorator, Hallmark WZT (EAMU 2008-2944) or Pyrethrum 5EC.
4Leaf hoppers Control leaf scratching on Chrysanthemum, Lamium, Salvia and bedding plants with Chess WG (EAMU 2008-2834), Decis, Majestik or Toppel 100. Install yellow sticky traps too.
4Leaf miner Control leaf damage on protected crops with early introductions of Dacnusa and Diglyphus parasitic wasps or apply Calypso (EAMUs required), Dynamec or HallmarkWZT (EAMU 2008-2944).
4Phoma Control stem dieback on Ceanothus, lavender and
l Increase predator numbers each week to keep pest populations at manageable levels. Switch to more tolerant high temperature species duringwarmweather, eg, Phytoseiulus persimilis to Amblyseius californicus for spider mites.
l Apply Calypso (EAMU 2008-2831), ChessWG, Decis, DursbanWGor Gazelle SG to Fagus, ornamental cherry, Malus and pines outside to control any woolly aphids. Use a wetting agent as appropriate.
l Black sticky spots on leaves and stems of protected crops of Buddleja, Digitalis or lupins can develop in humid conditions. No leaf damage occurs and irrigation or direct hand watering will help to remove it.
l Apply Amistar (EAMU 2009-0443), Bumper 250EC (EAMUs required), Fandango (EAMU 2009-0226), Folicur, Lyric or Signum (EAMUs required) to active rust infections.
ISTOCKPHOTO.COM
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32