Ribes blister aphid: Feeding from these aphids causes leaf distortion, blistering and discolouration of foliage (red or sometimes yellow) and they are active now on crops. Eggs overwinter on plants emerging in spring, feeding into the summer months. Control with Decis, Hallmark WZT (EoA 2008-2944)...
Dull, damp weather - Watch for Botrytis on soft foliage and Rhizoctonia on bedding and cuttings. Check plants that may have been overwatered and maintain good air movement around foliage. Aquilegia - The small, green caterpillars of the aquilegia sawfly can cause a quick defoliation of plants....
Whitefly: Predators will struggle to control high numbers of whitefly adults. Order combinations of Encarsia and Eretmocerus when the scale stage is found. Hang cards away from sun and direct irrigation. Rotate sprays on ornamentals crops using Chess WG (EoA 2008-2834), Intercept 70WG, Majestik,...
Bed watering Automatic irrigation can have an uneven output so check crops along bed edges and pathways for drought. Keep different compost types and pot sizes separate as much as possible. Start an irrigation efficiency drive with water shortages looming. Spider mites Ensure Apollo 50SC (EoA 2001-2271)...
Bees: Notify local beekeepers if spraying flowering crops. Check product labels for information and only apply when bees are not foraging - early morning or early evening depending on the weather. Scab: Check local weather forecasts for vulnerable times of scab infection on Chaenomeles, Crataegus,...
Frost and spraying: Take care with warm days and cold nights - only spray when there is no risk of frost on the following day. Products that contain adjuvants will enhance uptake and increase efficacy but can leave soft foliage without adequate cuticle. This vulnerable foliage may be damaged even in...
Water conditioners Soften hard water going into your spray tank and reduce foaming by using X-Change or Validate from De Sangosse. These products bind to calcium and magnesium and can act as pH buffers. Adelgids These are aphid-like insects that excrete white fluffy deposits as protection against...
Powdery mildew Warmer days can bring out powdery mildew on miniature roses. Apply Amistar (EoA 2009-0443), food-grade potassium bicarbonate or Systhane 20EW if seen.
Nutricion: Mild, dry days are ideal to start applying top dressing products to container-grown stock plants and trees. Use Sincron, Triabon or Floranid Permanent - they break down and leave a better visual look to the pot surface. For field crops, use a 1:1:1 horticultural grade fertiliser. The potash...
Peach leaf curl - Taphrina spp. that cause curling, distortion, puckering and blistering of leaves, stems and fruit (see p26) can be controlled with applications of Cuprokylt (EoA 2006-3134) onto peaches, apricots, nectarines and almonds. Some peach cultivars are sensitive to copper oxychloride so...
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