A com. Me(2E-2-(246-(2-cyanophenoxy)pyrimidin-4-yl]oxy)-pheny1-3-methoxyacrylate-contg. fungicide was studied for storage stability for 1 and 2 years at 20 +/- 2 degrees C. The changes in active substance content, pH, d., foam durability, sieve residue, suspensibility, spontaneity of dispersion, pourability of the fungicide were detd. No substantial difference between the original and stored samples were obsd.