DEVELOPMENT OF ALTERNARIA BLIGHT IN POTATO AGROCENOSES UNDER THE INFLUENCE OF STRESSFUL FACTORS

The article presents the data on potato agrocenoses affected by Alternaria blight under influence of various factors that have a stressful effect host plant and contribute to damage crop disease. It’s established nematodes increase susceptibility disease, promoting epiphytotic development at earlier stages ontogenesis. Under conditions natural infectious load pathogens weather disease was observed plants early ripening variety Breeze – 75,0 %, moderate mid Skarb mid-late Nara 40.0 % 35,0 respectively. In republic, high prevalence is in studied varieties, varying average from 62,0 100 %. From spp. fungi dominant species potatoes are A. alternata (77,8 %) solani (52,8 %). With blight, reaching 93.3–100 for dominance with frequency occurrence