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The most important commercial essential oil-producing species is peppermint (Mentha × piperita), a perennial herb of the family Lamiaceae. Mentha × piperita is indigenous in Europe and has widespread in cultivation throughout all regions of the world. The essential oil is obtained from the fresh leaves of peppermint by steam distillation and it offers a promising potential for future applications within the fields of agriculture, medicine, pharmaceutical industry and biotechnology. Fairly high consumption of the herb and leaves of peppermint as a drug along with increasing demands of the pharmaceutical industry laid on the amount and quality of the essential oil require ensuring continuous production of this plant. The economic variability of the peppermint oil industry depends upon maintaining high average yields of top quality oil. The rust presents a serious problem in the cultivation of commercial peppermint crops. The rust diseases are the most devastating diseases effecting aromatic and medicinal plants. They cause leaves to wither and fall, and also reduce the yield affecting thus the quality of essential oils and biologically active substances (Parbery 1996). Rust diseases affected over 50% of the leaves; however, a prolonged infection can almost completely defoliate the plant (Margina and Zheljazkov 1995). Mint rust is caused

Qualitative properties of Mentha × piperita (L.) after application of the fungicide Hattrick DP-50