16 October - Persistent pests

Pests: Where biological control applications have ended, use long-term products including Decis, Dursban WG, Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2015-1454) to clean up persistent aphids, capsids, caterpillars, leafhoppers and scale insects. Do not apply these after Christmas if IPM strategy is to follow next season.

Vine weevil larvae: Continue with nematode applications using Nemasys L. Control any remaining leatherjackets using Steinernema feltiae on protected crops.

Powdery mildew & rust: Both diseases produce resting spores that remain viable through winter. Use contact-acting, eradicant fungicides, which are more effective this month. Mildew products include food-grade potassium bicarbonate, Signum (EAMU 2012-2141), Switch or Takumi SC (EAMU 2013-1294). Rust products include Folicur or Signum (EAMU #2012-2141).

Bacteria: Prevent overwintering bacterial infections by applying Cuprokylt (EAMU 2015-1176) to ornamental deciduous Prunus species, especially those for bare-root sales.

Potting: Apply an anti-transpirant to evergreen plants post-potting to prevent excessive transpiration on warm days this autumn.

Irrigation: Check newly potted crops daily to avoid drought and encourage rooting this autumn. Note that established plants can quickly suffer from overwatering, especially on dull days. Inform key staff about the irrigation draw-down plan, showing drain valve locations for irrigation lines and mains. Include pumps, sprayers, fertiliser injectors and irrigators.

Autumn bedding: Watch for downy mildew on pansy and viola. Products for effective control this month include Fenomenal (EAMU 2013-1990), Infinito (EAMU 2013-0952), Paraat (EAMU 2011-2585), Percos (EAMU 2013-0819), Pergado Uni (EAMU 2012-1605), Revus (EAMUs required) or Signum (EAMU 2012-2141).

Botrytis: Control using Octave, Rovral WG (EAMU 2011-3200), Prestop, Serenade ASO (EAMUs required), Signum (EAMU 2012-2141) or Switch. Open doors and vents during the day and ensure crops are well spaced.

Renting new land: Carry out soil testing beforehand to check for plant parasitic nematode and Verticillium wilt levels.

Field preparations: Plough land now to get frost working for you this winter. Cracking will help to reduce waterlogging and enable successful early spring planting. Apply Roundup now to perennial weeds for long-lasting control. The glyphosate remains at a low level of activity all winter, providing good suppression the following season.


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