TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compounds: The copper is obtained from at least one of copper compound selected from copper sulfate, copper carbonate, copper oxide and/or copper hydroxide. The agent contains copper in bivalent form and as salts of amino acids and/or peptides or copper complexes with chelates. The agent has a copper concentration of at most 40 (preferably at most 20)% and has a pH of 2-9 in a 10% solution.    TECHNOLOGY FOCUS - AGRICULTURE - Preferred Agent: The agent is completely miscible and soluble in water. The agent is optionally combined with at least one cupric and/or sulfur-based chemical product.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The amino acids and/or the peptides are derived from the hydrolysis of waste or products of animals or vegetal origin, which are charged with individual free amino acids or their mixtures. The amino acids and/or peptides are also obtained by synthesis or fermentation. The amino acids and/or peptides have average molecular weight of less than 2000 Daltons. ACTIVITY - Fungicide; Antibacterial; Pesticide.    A test was conducted against grape mildew using the agent of the invention mixed with Thiovit (RTM; sulfur). There were 7 treatments with 0.3% dosage. No phytotoxicity symptoms were observed. The test was repeated on Chasselas grapes using 5% Cu agent at 0.3 and 0.6% doses, and 7% Cu agent at 0.1 and 0.2% doses as compared to other cupric products with nine treatments. The two higher-dose yielded a satisfactory protection against downy mildew, showing however, phytotoxicity symptoms. The lower doses maintain their effectiveness, though at a reduced level, exhibiting low phytotoxicity. The quantity of Cu distributed was unequivocally much lower and therefore more environmentally compatible. A test was conducted on Italian Riesling grape, in comparison with several other fungicides. 6 Treatments were conducted with 0.3% agents. The results for the test/control thesis and to the standard cupric product were as follows: 1) rate of infection of grapes (effectiveness %) = 16.8 (76.3%)/83.5 and 12.6 (84.9%) and 2) rate of infection on leaves (effectiveness %) = 9.6 (88.6%)/84.5 and 10.3 (87.8%).    MECHANISM OF ACTION - None given.    ADMINISTRATION - Administration of the active agent 0.05-10 % (50 g-10 kg dissolved in 100 l irrigation water). The agent is provided in a liquid or in a powdery formulation (claimed).