In 2016, 2017 studies on the influence of fungicides on the development of diseases on the leaf surface of carrots were carried out. To study were taken fungicides Akanto Plus, Signum, fast and Rex duo. The research was carried out on the varieties of carrots of the Primorskyaya 22 and Taiphun. The work was carried out at the seaside vegetable Experimental Station – branch of the federal State budget scientific institution "Federal Scientific Center of vegetable growing" in coastal zone of Primorsky Krai in conditions of monsoon climate with annual quantity Precipitation 700-800 mm, most of which falls on the summer period. Natural climatic factors of Primorsky Krai create the most favorable conditions for development of high infectious background of pathogenic flora. The leaves of carrots here are amazed fitopatogenami from childbirth Alternaria, Cercospora, Xanthomonas. Diseases appear in the sowing of carrots usually in the second half of the growing season, after clamping tops in rows. The first treatment of drugs was carried out at the appearance of the first signs of disease on the leaf surface of the carrot, two subsequent treatments-in 14-16 days, depending on weather conditions. The most biological efficacy after three treatment showed the fungicide Signum: 53.2% on the variety of Primorskyaya 22 and 54.3% on the grade Taiphun, which contributed to the highest yield of carrots in this variant. The increase in the yield of standard root crops was here 10.0 t/ha or 41.0% on the grade of the Primorskyaya 22 and 7.6 t/ha or 28.4% on the grade Taiphun compared to the control version.