To evaluate the efectivity of pyraclostrobin in comparison with the other fungicides to control citrus black spot (CBS), in commercial orchards of orange 'Valencia late' in the Corrientes, Argentina, testing different combination of doses, frequencies and spray moments of pyraclostrobin 25%, mancozeb 80% and benomyl 50%. The environmental conditions for CBS development were favourable during spring, with less infection in southwest sector of trees. The greatest efficiency in CBS control (95.5% fruit degree 0), was obtained with 30 mL of pyraclostrobin sprayed in three moments (October, November and January). Due to the risk of resistance appearance with of three sprays strobilurins in the season, it would be recommendable its use in two late sprays (November and January), which allowed to obtain between 75% to 88% fruit without symptoms.
benomyl; doses; frequency; mancozeb; strobilurins
