FIELD: organic chemistry, fungicides, agriculture. SUBSTANCE: invention describes novel composition containing derivative of 1,2,3-thiadiazole as an active component of the general formula (I) where R1- is (C1-C6)-alkyl; R2 is the group of the formula CO-Y-R3 where R3 is hydrogen atom or substituted phenyl group having 2 different substituents taken among halogen atom and (C1-6)-alkyl and Y means O or NR4 where R4 is hydrogen atom and at least one compound taken among the group of compounds with fungicide activity against plant diseases and including the following agents: isoprothiolan, tricyclazol, azoxistrobin, propiconazol, copper 6-hydroxyquinoline, oxolinic acid, bennomyl, myclobutanyl, iprodion, cyprodinyl, pyrimethanyl, fludioxonyl, quatasine, mancozet, chlorotalnyl, fermizon, cimoxanyl, kazugamycin, flutolanyl, metalaxyl, fosetyl and prochloraz in the mass ratio 0.04-3.5 part of indicated fungicide compound to the 1-st moiety of compound of the formula (I). Described composition prepared by mixing derivative of 1,2,3-thiadiazole of the general formula (I) is useful as an agent for control of plant diseases with at least one fungicide shows fungicide activity against plant diseases. Invention describes also method of use of this composition for control of plant diseases. EFFECT: enhanced effectiveness of fungicide composition, improved method of control. 4 cl, 15 tbl
