23 September - Suckers, lavenders and tortix moths

Sucker insects Control on growing tips of eucalyptus and acacia with Chess WG (SOLA 2008-2834) or, in non-IPM systems, Calypso (SOLA 2008-2831), Gazelle or Decis.

Lavenders Control the spread of Botrytis and shab with Amistar (SOLA 2009-0443), Octave, Signum (SOLA 2009-1842) or Switch. Make sure that fungicides penetrate the plant crown.

Tortrix moths Spray with Decis or Toppel 100EC in non-IPM systems. IPM-friendly products include Conserve, Dimilin Flo, Insegar WG, Majestik, Nemolt (SOLA 2010-2131) and Runner (SOLA 2008-2903). It is critical to select the correct pheromone for tortrix traps. Install one of each in separate Delta traps if you are unsure which one you have and identify culprits through observation.

Mare's tail Control this persistent weed with Weedazol-TL, MCPA or products containing triclopyr on non-crop areas.

Stem cankers Spray prunus species with a tank mix of Serenade ASO (SOLA 2009-0246) and Cuprokylt at least twice before leaf drop to control over-wintering canker levels. To avoid stem cankers, do not lift vulnerable trees in leaf. Spraying with copper masquolate (Synthron EDTA Cu 9.1 per cent) two weeks before lifting is of benefit. Use a transport system that keeps stem damage to a minimum to reduce the risk of infection. Store species with which you have most problems under cover this winter.

Dew Wet foliage is not drying off as quickly on cloudy days, making some plants more vulnerable to fungal and bacterial infections.

Field weed control Moist, fine soils will provide effective herbicide applications. Remove persistent perennial weeds in field-grown hardwood trees with directed sprays of Butisan S, Chikara, propyzamide or low rate Roundup. For roses, apply Dow Shield as a directed or hooded spray.

Mulches With only Ronstar 2G as a granular herbicide for compost surface weed control, mulching is becoming more popular on protected crops. Machinery for bark chip applications is available with many growers using them successfully. Biotop, coir mats, polythene slips, grit and shredded Miscanthus are also available in varying quantities. Product effectiveness depends on good coverage and the time of year when it is applied.

John Adlam, Managing director, Dove Associates


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