| Abstract: | Phytophthora gummosis and phytophthora root rot are the most important fungal diseases of citrus in the State of São Paulo, Brazil. Phytophthora citrophthora and P. nicotianae var. parasitica are the main species that incite both diseases in all the citrus-growing areas of the State. Studies on the control of gummosis and root rot with systemic fungicides have been under way in the State since 1980. The efficacy of fosetyl-A1 and metataxyl to control gummosis incited by both fungi in lemon and sweet orange trees was confirmed. The best control was achieved when foliar sprays of fosetyl-A1 were combined with soil applications of metataxyl. The best timing was determined for application of these systemic products to control gummosis in the state. |
