Apply Biscaya as pests approach thresholds.
Oilseed Rape: Control of Pollen Beetle - Control beetles as soon as threshold is reached during green to yellow bud stage.
Oilseed Rape: Control of Myzus persicae the aphid vector of Turnip yellow virus (TuYV) – Monitor AHDB Aphid bulletins, inspect crops when migration begins and spray when Mysus persicae first found in crops.
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Potatoes: Best results are achieved by using it as the first and third sprays in programmes to target colonising (seed and ware) and on seed crops non-colonising aphids. In seed potato crops increasing emphasis is being placed on controlling non-colonising aphids, in this case alternate those treatments with Biscaya. Where Myzus persicae and Macrosiphum euphorbiae are migrating you should plan to alternate Biscaya with Plenum WG (pymetrozine) or Teppeki (flonicamid).
Wheat: Pheromone traps provide a helpful early warning. Finding 30 or more male midges per day in traps indicates a risk to crops in the following week, when females can be expected to be laying eggs. This is the cue to start checking crops at dusk for female midges, and to assess whether or not treatment is needed.
HGCA advised treatment thresholds are one midge per three ears in susceptible feed crops, and one midge per six ears in milling and seed crops.
Brassicas: In very difficult to cover brassica crops, such as Brussels sprouts, an adjuvant can improve the efficacy of Biscaya in the control of Brevicoryne brassicae. Applications are most effective before colonies form, and levels of control may be reduced where high, established populations are present. In such circumstances a follow-up aphicide application may be required.
Carrots and Parsnips: Apply as aphids start to build up in the crop, usually during May. Crops are most susceptible to damage during early growth and are vulnerable from the cotyledon stage.
Peas: For pea aphid control, apply as aphids start to build up in the crop. Application at early flowering (according to local warnings) gives reduction in damage from pea midge