Іnfection of winter barley by major fungal diseases in the conditions of the Western Forest-Steppe

Winter barley is a valuable grain crop that gives high yields if agricultural cultivation techniques are followed.Changes in the climatic conditions for the cultivation of winter barley, in particular, an increase in air temperature and variability of precipitation, as well as non-observance and violation of traditional farming systems, characterize the modern phytosanitary state of crops and directly affect the development and spread of pathogens.Thus, almost every year in the agrocenosis of winter barley, the phytopathogenic load of fungal pathogens increases, which under susceptible conditions can lead to a decrease in crop yields by 30 percent or more.The article provides three-year data on the results of research on the study of the influence of abiotic factors on the damage caused by the main fungal diseases of winter barley.It was established that during 2021-2023 the dominant diseases in winter barley crops were: powdery mildew, rhynchosporiosis, dark brown spotting.With the help of the hydrothermal coefficient (HTC), it was determined that the damage of winter barley by fungal diseases is influenced by the weather conditions of the research years.The appearance and development of rhynchosporiosis and dark brown spotting on winter barley is facilitated by the increased amount of precipitation in the third decade of Mayfirst decade of June, when HTC reaches 1.4 and higher.The least affected by diseases during 2021-2023 over the vegetation period of winter barley was noted in the following varieties: dark brown spotting disease -Darii (7 points), Status and Valkiriia (6 points each); powdery mildew -Darii and Status (7 points each), Valkiriia (6 points); rhynchosporiosis -Snihova Koroleva, Valkiriia and Status (6 points each).