In vitro antifungal/fungistatic activity of manganese phosphite against soybean soil-borne pathogens

SCANDIANI, M.; CARMONA M.; SAUTUA, F.; RAVOTTI, M; LUQUE, A.; SIMONETTI, ESTER

PHYTON - INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY BA ARGENTINA

FUNDACION ROMULO RAGGIO

Lugar: Buenos Aires; Año: 2017 p. 265 - 269

0031-9457

Soybean root and stem rots caused by soil-borne pathogens are diseases commonly found in soybean fields and one of the most important causes of crop loss. In the present study, the mycelial sensitivity of Fusarium virguliforme, F. tucumaniae, Sclerotinia sclerotiorum and Macrophomina phaseolina was evaluated on potato dextrose agar media (25 mL) supplemented with different concentrations of manganese phosphite (MnPhi) diluted in water (0, 25, 37.5, 50, 100, 200, 300, 400, 500, 800 and 1000 µg mL-1). Mycelial growth sensitivity was analyzed using logarithmic linear regression analysis. The MnPhi concentration needed to inhibit 50% of the mycelial growth (IC50) ranged from 105 µg mL-1 (Fusarium spp.) to 409 µg mL-1 (M. phaseolina). Sclerotia were completely inhibited at 500 µg mL-1. The results of the present study represent first reports of direct in vitro fungicidal/fungistatic action of MnPhi against fungi that are causal agents of soil-borne diseases.