Damageability of plum varieties of aphids in Tatarstan

The purpose of the research is to assess the damageability of varieties and forms of domestic plum, Chinese and Russian plum aphids in the conditions of the Republic of Tatarstan and to identify the best of them in terms of resistance to this pest. The damageability of varieties and forms of plums by aphids was assessed according to the methodology of the All-Russian Research Institute of Breeding of Fruit Crops. In the conditions of the Republic of Tatarstan, the most resistant to plum aphids are the varieties of domestic plum Sverkhrannyaya (k.), Sineokaya, Renklod Tenkovsky (k.) and Kazanskaya. Variability of damageability to leaves and shoots of plum aphids in 2017-2020 the varieties and forms of domestic plum were significant (V=22.2-66.7%), in Chinese and Russian plum varieties – medium (V=10.5-12.8%). An insignificant positive correlation is observed between the degree of damage to the leaves and shoots of plum aphids and the damage to the leaves of plum varieties by clusterosporiosis (r = 0.57). An insignificant negative correlation was established between the degree of damage to varieties and forms of aphid plum and the amount of precipitation during the summer (r = -0.32) and vegetation periods (r = -0.42), the hydrothermal coefficient in the summer (r = -0.33) and vegetation (r=-0.54) periods. The damageability of leaves and shoots of plum aphids is more influenced by the genotypes of plum varieties and forms (74.1%) than the conditions of the year (11.2%) and the interaction of genotypes with the conditions of the year (12.2%).