The biological efficiency of new fungicides for preventing and control potato diseases

Potato growing technology, along with well-known and appreciated agrotechnical processes, also includes a lot of new elements. It is constantly supplemented with new varieties, which possess various resistance to diseases and pests, which properly require a special hanging related to the use of pesticides. In connection with this, it is necessary to develop an integrated set of measures to protect potato crops from pests, diseases and weeds. But limiting only to agrotechnical methods often leads to compromising the quantity and quality of the harvest. Therefore, along with various preventive methods, it is necessary to use the chemical method. Namely by the correct use of fungicides, the performance of chemical treatments in optimal terms and in the recommended doses, which ensures a high effectiveness of the chemical method of protection of potato diseases. These objectives can also be achieved by implementing in practice an integrated potato protection system, scientifically argued, in which a special place is offered for the use of new fungicides, with various mechanisms of action. Based on the above, the aim of current research was to study the biological efficacy of Kuprumacs 840 DF (copper oxychloride, 840 g/l), in controlling phytopathogenic fungi Phytophthora infestans and Alternaria solani. In the research year 2020, relatively favorable conditions were created for the development of the phytopathogenic fungus A. solani and less favorable for the development of potato manna. The fungicide Kuprumacs 840 DF, with a consumption rate of 2,2 kg/ha, does not provide a satisfactory protection of the potato against A. solani and Ph. infestans. The most effective for control of A. solani and Ph. infestans is the fungicide Kuprumacs 840 DF, with a consumption rate of 2,5 kg/ha, which ensures a biological efficiency of 82,62 and 83,65% respectively.