Abstract

This paper examines some of the consequences of adopting the Leaf-Wall-Area (LWA) method of dose expression for the registration of plant protection products used in commercial orchards. The examination method uses Light Detection And Range (LiDAR) recordings of a wide range of UK pome-fruit orchards and a generalised dosage model to simulate the results of deposit trials with a broadcast air-assisted sprayer. The results are constrained in accordance with the normal practices of pesticide registration (i.e. the recommended LWA dose rate is assumed to be efficacious and safe to use below the maximum dose per unit ground area). The discussion of results examines new regulatory aspirations for improving the efficiency of pesticide use through the introduction of LWA dose expression and considers the needs for additional information to support spray applications with and without dose adjustment.

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