The effect of two active ingredients of fungicides on pure culture of Botrytis cinerea Pers was assessed. The analysis was carried out for 16 possible combinations of cyproconazole and fludioxanil, one of which was a control one. According to the results of measurements of the dry weight of mycelium in an accumulative culture, a diagram was constructed and two-factor analysis of variance was given. It has been established that the combined effect of these fungicides has a significant effect on the growth of mycelium. The following combinations had significant effect: fludioxonil at maximum concentration (0:10), 1 part of cyproconazole and 10 parts of fludioxonil (1:10), 5 parts of cyproconazole and parts of 10 fludioxonil (5:10), 10 parts of cyproconazole and 5 parts of fludioxonil (10:5), and the maximum concentrations of two substances (10:10).

The problem of optimization of ecological conditions of urbanized and agricultural areas of the arid zone is especially urgent nowadays. Severe forest conditions make it necessary to optimize the environment due to the protective plantations of different types and ecological categories. The use of woody plants unusual for a given area as part of multifunctional stands is one of the main methods for increasing the ecological capacity of the territory, changing the structure and population of insects. The study was conducted in Volgograd, Samara and Rostov regions. By the degree of biotic potential accumulation among the trees adapted in the arid region, plants of the Ulmaceae, Rosaceae and Fabaceae families are distinguished. The introduction of woody vegetation into new territories is also accompanied by the penetration of alien species of pests. Currently, among the phyllophages of woody plants used in landscaping various landscapes, there are invader insects. In urban areas, these species are particularly closely associated with Robinia pseudoacacia L. The most numerous as part of the pests of assimilation apparatus of this plant are Obolodiplosis robiniae (Haldeman, 1847) and Nematus tibialis (Neuman, 1837). Dissemination of Robinia by these insects in the protective forest plantations varies greatly. In the roadside forest plantations and the agroforest plantations in the composition of dendroflora the species of the family Ulmaceae are predominant. Among the invasive species that appeared in them is Aproceros leucopoda (Takeuchi, 1939); in these stands, it almost completely destroys the elm foliage. In the crowns of trees of recreational landscaping, single individuals of this species are found. Among the dendrophages of the stands of urbanized and forest-agrarian landscapes, open-living leaf-eating insects giving outbreaks of mass reproduction (Xanthogaleruca luteola, Dicranura ulmi, Cladius ulmi, Aproceros leucopoda) stand out. Wide spread and increase in the number is observed in Obolodiplosis robiniae and Fenusa ulmi.

Seed treatment before sowing is the basis for increasing sowing qualities, stable development and resistance of seeds to harmful organisms. Greening of production processes of forestry makes it necessary to find new methods of pre-planting treatment, which include electric impact on planting material. For the first time, materials are presented on the study of the effect of an electric field of high voltage alternating current on Robinia pseudoacacia L. seeds with the identification of optimal exposure modes that increase the sowing and growth properties of seeds.

In maintaining the material and energy balance of dry-steppe and semi-desert ecosystems, the main active component is forest-reclamation complexes of various purposes. In addition to environmental stabilization and other economic functions, protective plantings are also reserves of regional biodiversity. Research was carried out on permanent test sites in dendrological collections and protective forest stands of the Federal Research Center of Agroecology of RAS, as well as in recreational and landscaping plantings using route and stationary methods in different types of forest plantations that differ in condition, level of anthropogenic impact and maintenance regime. The assessment of the forest pathology status of stands was carried out using standard methods and in accordance with the current guidelines for forest pathology survey of plantings and forest pathology monitoring. It was found that in the spectrum of the examined plants, the most prosperous state of the dendroflora is distinguished by arboretums and forest belts. Urban plantings are dominated by severely weakened and shrinking trees (up to 80.0%). The main pathologies in them were shrunken tops and skeletal branches, xylophages, diseases of foliage, wood and trunks. The least pronounced anomalies of woody plants in forest belts (10.7-22.0% lower than in other types of plantings).

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