INVESTIGADORES
RAPISARDA Viviana Andrea
congresos y reuniones científicas
Título:
EVALUATION OF POTASSIUM PHOSPHITE TREATMENTS FOR LEMON BROWN ROT MANAGEMENT IN TUCUMAN, ARGENTINA
Autor/es:
RAMALLO, A. C.; CERIONI, L.; OLMEDO, G. M.; RAMALLO, J.; RAPISARDA, V. A.
Reunión:
Congreso; International Citrus Congress 2016; 2016
Resumen:
Potassium phosphite (Phi-K) is widely used in citrus for control Brown Rot (BR) and other diseases caused by Phytophthora spp. in pre- and post-harvest treatments. During 2014, 2015 and 2016 different commercial Phi-K formulations were evaluated both in vitro and in vivo using a local isolate of P. citrophthora. Phi-K in vitro inhibited mycelial growth (EC50= 47.9 µg/ml), but did not affect sporangia production, spore mobility or germination at the tested concentrations. In field trials, a single foliar application of 0.4% Phi-K before harvest time, reduced BR incidence by 40.7 and 12.8% compared to the control when was evaluated in artificially inoculated fruit at 30 and 100 days post-application, respectively. In post-harvest dip treatments, 2000 µg/ml Phi-K showed a pre-infection BR control of 28.5% and a post-infection control of 25.8%. Effectiveness of post-harvest treatments increased with time, reaching maximum control values of 64.9 and 68.3% when was evaluated at 7 and 14 days after treatment. Phi-K slightly increased control efficacy in combination with conventional fungicides. No statistical differences were observed between different commercial Phi-K formulations. Phi-K effectiveness in controlling BR presents lower levels than that observed in other citric production areas.