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Powdery mildew remains one of the world's most severe and persistent threats to grape production, with viticulturists using more chemicals to control this disease than any other vineyard problem. Traditionally, fungicide applications are timed according to the Powdery Mildew Risk Index (PMI). However, the PMI leads to over-applicating fungicides when disease pressure is low. Unlike the PMI, Root's technology allows growers to monitor disease pressure and accurately assess when and where interventions are needed.