SWITCH® ONE SWITCH® ONE is a broad spectrum contact fungicide that can act at various points in the life cycle of fungi. SWITCH® ONE is specially formulated for foliar application, protecting against the diseases reported in the Instructions for Use Table, in the field and during the storage and marketing period. SWITCH® ONE is a product with preventive and residual activity. It can be used in an anti-resistance management program, since it has no cross-resistance with benzimidazoles, dicarboximides or triazoles.