FIELD: agriculture, more particularly fungicide for controlling widely occurring green plant diseases, namely phytophthora. SUBSTANCE: claimed method comprises reacting copper chloride solutions with copper ion concentration of 120 g/l and pH of solution of 0.9 with aqueous calcium carbonate under continuous stirring and bubbling with compressed air at 25-30 C, chlorine ions being stabilizer. Copper oxychloride agent in colloidal form has high dispersity with particle size of not greater than 1 mcm. EFFECT: more efficient method. 6 ex, 1 tbl
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