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The discovery of resistance to white drenches proved a wake-up call for Peter Loxdale of Castle Hill Estate in Llanilar, near Aberystwyth.
By drenching only when required, Castle Hill has reduced the use of drench by 1-2 drenches over the season, saving around pounds 500.
The company, which supplies Sainsbury, M&S and Waitrose, claimed successful trials by its technical arm Qualtech proved it was possible to eliminate post-harvest drenches.