FIELD: crystal growing. SUBSTANCE: high eutectic purity (at least 98%) crystal modification B with melting point 73 C, preferably 73-75 C, and NH oscillations in IR spectra 3200-3300 cm-1, in contrast to modification A, is not disposed for crystal growth when used as fungicidal substance. Substance is stable on large-scale storage preserving its original good capability of being suspended and dispersed. Crystal modification B is prepared by crystallization either in organic solvent at temperature above 26 C or from melt with initial temperature 72-74 C. Fungicidal composition contains crystal modification B with melting point above 73 C in fungicidal amount in combination with a relevant carrier. EFFECT: increased purity and storage stability. 11 cl, 2 dwg, 6 tbl, 9 ex
