Diseases and pests of representatives of gene Syringa, Spiraea and Philadelphus in city conditions

The urbanized environment is highly aggressive towards the plant component of urban ecosystems. Intensively changing weather and climatic conditions, the rapid evolution of pests and diseases necessitate monitoring studies of the prevalence and pathogenicity of pests on ornamental crops. Urbanoflora used in urban floristry should include adapted species from among those for which this environment is a natural habitat, as well as introduced species exhibiting high resistance to a complex of abiotic and biotic stresses, used as an additional assortment in urban greening. The object of the study was flowering shrubs: Syringa vulgaris L., Syringa josikaea L., Syringa velutina L., Spiraea x bumalda , Philadelphus coronarius L. The aim of the study is to monitor pests and diseases of flowering shrubs of the genus Syringa , Spiraea and Philadelphus in the city of green spaces. We carried out an assessment of the harmfulness of diseases and pests in an urbanized environment, according to which the assessment of the general condition, decorative qualities and the degree of damage by entomological and phytopathological objects is carried out on a five-point scale. The ranking of flowering shrubs in plantings of general and limited use, plantings of special purpose was carried out according to the assessment of the life state on the basis of resistance to abiotic and biotic environmental factors. The predominant non-infectious diseases, phytopathogenic objects and phytophages were revealed: on Spiraea bumalda - Aphis spiraephaga and Tetranychus urticae ; on Syringa vulgaris , Syringa josikaea and Syringa velutina - Gracilaria syringella and Phyllobius . The greatest resistance to malicious objects is characteristic of Philadelphus coronarius . The greatest resistance to stress in the urban ecosystem was noted in Philadelphus coronarius and Syringa velutina ; medium - Syringa josikaea ; low - Spiraea bumalda .