Nursery stock advice line 01379 741999
Viburnum using Octave, Serenade ASO (EAMUs required), Switch or Signum (EAMU 2012-2141).
4Pine shoot moth Control with Decis, Dursban WG or Toppel 100 to disrupt the cycle of adult egg-laying and larval hatching. Adding a wetting agent (check product labels) helps coverage.
4Sciarid Yellow sticky traps attract adults away from compost surfaces and foliage; change weekly with high populations. Drench with nematodes (Steinernema feltiae) or introduce Hypoaspis or Macrocheles mites. Larger areas can be treated with rove beetles (Atheta coriaria). Control adults using Decis (non-IPM) or Dimilin Flo and larvae using Met52.
4Thrips Introduce predators weekly to foliage (Amblyseius cucumeris) and compost (Atheta coriaria or Macrocheles robustulus) and apply Naturalis-L in >60% relative humidity conditions. Leave a week’s interval before applying predators if using Conserve or Dynamec. It is reported you could add sugar (10g/100lt) or Attracker to thrip sprays. Install pheromone lures to blue sticky traps now.
4Whitefly Control on ornamental crops with Chess WG (EAMU 2008-2834), Eradicoat, Majestik, Mycotal, Movento (EAMU 2011-1987), Naturalis-L, Oberon (EAMU 2004- 1718), Savona or SB Plant Invigorator. For non-IPM situations, use Decis, DursbanWG, Gazelle SG, Hallmark WZT (EAMU 2008-2944), Pyrethrum 5EC, or Toppel 100.
…for the garden centre
Time to promote Biological controls Encourage customers to control pests naturally with biological controls such as lacewings, ladybirds and parasitic wasps and mite species. Use them in conjunction with pheromone lures (from Growing Success and Agralan) to help identify moth species. Sticky traps (both yellow and blue) can help with monitoring certain pests in greenhouses and tunnels. Black bean aphid control Savona, or products containing pyrethrins or SB Plant Invigorator, are suitable for controlling black bean aphid on Euonymus, Viburnum and Philadelphus and thus preventing it transferring to pea and bean crops. Repeat applications may be required. Note: weed hosts include mayweeds, fat-hen and sow thistles. Capillary matting Used in the greenhouse, capillary matting provides a reservoir of moisture throughout the day. Lime Apply to brassica soil and raise pH to inhibit club root. Mulches and weed control fabric Mulches help maintain good soil moisture levels and act as a weed suppressant. Weed control fabric under mulch will really help to minimise weed growth.
Pass it on l Advise customers to remove rootstock suckers from fruit and roses.
l Check plants for powdery mildew, rust and black spot along with sawflies, winter moths, aphids and spider mites, especially under protection.
l On cool damp days open greenhouse doors and vents to reduce the risk of Botrytis and downy mildew.
Seasonal promotion Plant of the month July
Introducing the season’s best and most widely available plants to your customers
3 3
T
Dahlia
Huge choice of flower colours and shapes Versatile
he first dahlia tubers arrived inEurope at the end of the 18th century, sent over toMadrid by the Spanish settlers inMexico. Originally grownas a vegetable, the
first flowering cultivarswere bred in
Belgium.Today the plants range fromdwarf bedding to giant cactus-flowering types with blooms the size of dinner plates, which are the mainstay of the showbenches of local horticultural shows. Dahlias flower fromJuly through to the first autumn
frosts.They performa number of roles: colourful bedding for borders and containers, a bold addition to a tropical- inspired planting, or as a statement plant for the border. For maximumimpact it’s hard to beat a whole bed filled with dahlias –aninteresting twist is a rockery planted up with dwarf cultivars.However you choose to growthem, dahlias are a great way to end the summer with a splash of colour. They do best in full sun inwell-drained, fertile soil
(dig in plenty of organic matter and use a general-purpose fertiliser).Wait until after the last frost before planting tubers outdoors, or start them off in pots under cover in late winter. Bury tubers12cmdeep with the‘eyes’ uppermost. Keepwell watered andwhenflowering starts feed with a high potash liquid fertiliser once a fortnight. Tall dahlias will need staking. Be ever vigilant regarding slugs and snails. In cold areas, lift tubers and store overwinter; in mild areas, cover the crownof the plant with mulch for frost protection.
Companion plants Herbaceous perennials, eg, phlox,monarda, aster, sedum.
Recommended
Dahlia ‘AnnBreckenfelder’: golden eye with red-orange10cm flowers, H1.2m. D.‘Fascination’: bronze foliage and semi- double, pink16cmflowers, H90cm. D.‘Twyning’s After Eight’: bronze-black foliage, orangeeyewith8cmwhite flowers,H1.2m. D.‘DavidHoward’: bushy plants, bronze-orange10cmflowers, purplish foliage, H75cm.
_Plant of the Month POS materials are available from HTA partners Hortipak and Floramedia. For details please
visit
www.the-hta.org.uk/plantofthemonth2013 HTAnewsI June 2013 I
www.the-hta.org.uk 29
Use plant protection products safely. Always read the label and product information before use. HTA/Dove Associates shall, in no event, be liable for the loss of or damage to any crops or biological control agents caused by the use of products mentioned
JOHN WOODS
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