Efficacy of inorganic salts against Rhizoctonia solani, the incitant of stem canker and black scurf of potato.

摘要

A total of 40 inorganic salts were tested against the mycelial growth of 2 isolates of Rhizoctonia solani, the incitant of black scurf and stem canker and root rot of potato. Ammonium molybdate, cupric sulfate, ferric chloride, potassium metabisulfite, disodium tetraborate and salicylic acid were 100% inhibitory against both isolates at 20 mM. Nineteen salts, which showed >50% inhibition against both isolates, were further tested at 1.0 and 10 mM. Disodium tetraborate was 100% inhibitory against the black scurf isolate at 1.0 mM, while potassium metabisulfite showed the highest inhibition (94.4%) against the stem canker and root rot isolate at the same concentration. At 10 mM, cupric sulfate, EDTA, ferric chloride and disodium tetraborate completely inhibited both isolates. Inhibition % mean in steam and membrane filtered salts were at par and insignificant against the black scurf isolate..