The article presents the results of study of the resistance of plum varieties to the main fungal diseases. These include moniliosis, klasterosporiosis, polystigmosis. The study was carried out for 5 years from 2013 to 2017. The objects of study are 23 plum varieties of various ecological and geographical origin, growing in the collection of Primorsky Fruit and Berry Experimental Station. The zoned variety Nadezhda Primorya was used as the control. The study was carried out according to the method of stone fruit crop assessment for resistance to diseases and pests. The degree of damage to trees by fungal diseases was assessed visually in the field conditions, using 6-point scale. It was found that the degree of fungal diseases affecting plums depended on the variety, its origin and weather conditions of the year. The nature of the disease sign manifestation on the plum is given. The plum varieties resistant to the most harmful fungal diseases – moniliosis, polystigmosis, klasterosporiosis have been identified. Complex resistance to fungal diseases was revealed in the varieties of Primorsky Fruit and Berry Experimental Station – Primorochka, Shchedraya, Varvara-krasa, and in the introduced varieties Globus, Iyulskaya rosa, Kolonovidnaya, Asaloda. These varieties can be used in the selection of plums for a complex of economically valuable traits.

Yakovleva Valentina V.

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