18 June - Bacterial infections

Cuprokylt A new 120-day Emergency Authorisation (2018-1244) has an end-use date of 28 September 2018.

It has approval for use on Prunus spp. for bacterial infections and bacterial canker. It cannot be applied via handheld equipment. Download your copy now from the CRD pesticide database https://secure.pesticides.gov.uk/offlabels/search.asp.

Escallonia Avoid yellowing and defoliation of lower leaves by applying foliar sprays of Epsom salts (magnesium sulphate) at 15g per litre of water to run-off.

Watering Check irrigation programmes daily to avoid compost sitting wet and to make sure they are appropriate to weather conditions. Irrigate during cooler periods of the day to avoid leaf scorch on soft foliage. Also, reduce controlled-release fertiliser by 10 per cent, to avoid root damage. Regularly check crops along bed edges and pathways — do not assume automatic irrigation systems are producing an even output at the right intervals. Encourage root production on poorly established plants by using liquid feeds high in phosphate such as ICL’s Plant Starter, Solufeed 1:5:1, Universol Yellow or Hortimix 1:4:1. Use overhead irrigation later in the day to wash through salts that can build up on plants, particularly those grown on sand beds.

Mealybug Where possible, control using predators including Cryptolaemus montrouzieri along with Leptomastix dactylopii (for citrus mealybug) and L. epona for vine mealybug. Control products include Decis (non-IPM, EAMU 2014-1011), Movento (EAMU 2011-1987), Pyrethrum 5EC, SB Plant Invigorator or Spruzit.

Black root rot Check for patchy black damage on roots plus black lesions at the base of stems alongside leaf yellowing. Drench with Cercobin WG (EAMUs required) or apply a directed spray of Switch for active infections. Use Prestop (EAMU 2015-2773), Trianum P or Serenade ASO (EAMU 2013-0706) drenches on vulnerable crops as biologically-active preventive treatments. All applications should be within crops’ irrigation regimes to avoid long periods of wet compost.

Tortrix moths Once identified with pheromone traps, control with Conserve, Dimilin Flo, DiPel DF, Explicit (EAMU 2011-2090), Insegar WG, Pyrethrum 5EC, Runner (EAMU 2012-0448), Toppel 100 (non-IPM) or Tracer (EAMU 2008-2908).

Whitefly Control on ornamental crops using Chess WG (EAMUs required), Eradicoat, Mainman (EAMU 2013-0045), Majestik, Mycotal, Movento (EAMU 2011-1987), Naturalis-L, Pyrethrum 5EC, SB Plant Invigorator or Spruzit. Non-IPM situations can also add in Decis (EAMU 2014-1011), Gazelle SG, Hallmark WZT (EAMU 2008-2944) or Toppel 100.

John Adlam, managing director, Dove Associates


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