Field resistance of pear varieties to psylla pyri

Abstract. Pear is a valuable fruit crop, the fruits of which are rich in various minerals and vitamins. On the territory of the Krasnodar region, less than 4% of the total area of pome crops is accounted for by pears. One of the main reasons why farms refuse to cultivate pears is the high cost of controlling the number of Psylla pyri L. In this regard, the goal of our study is to research the resistance of pear varieties to pear psylla in different gardening areas of the region. The results of the research and their subsequent practical application will contribute to an increase in the area of pear plantations. The research was carried out in the Prikuban zone of the central and zakuban gardening subzones of the Krasnodar region in 2021-2024. The assessment of the damage of 14 pear varieties by Psylla pyri L. was carried out by weekly monitoring of the pest development throughout the growing season. It was found that in the early spring period, preference for egg laying is influenced by both the physiological features of the structure of shoots and buds, and the phenological phase of pear development. It was noted that the maximum oviposition is observed on early ripening pear varieties. Pear varieties have been identified, which have the least number of nymphs in the summer: Bere Klerzho, Avgustin Perron, Krasnodarskaya letnyaya, Talgarskaya krasavicza. It was found that in these varieties the sugar content in the leaves phloem sap is 6-10 mg/g of crude matter, in the severely damaged varieties Zimnyaya Mlievskaya and Moldavskaya rannyaya at the level of 14-17 mg/g of crude matter. Keywords: pear, varieties, stability, pear psylla