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Irrigation not only changes the ecological conditions of cultivation, but also modifies the existing phytopathocenoses and entomocomplexes, exerting a comprehensive and multi-vector effect, which requires significant changes in protection technologies, development of new methods of pest control. It is important to select a modern range of chemicals that can be effectively used in chemicalisation. The purpose of the study is to identify promising active substances of pesticides for drip irrigation and to develop schemes for their application. Field experiments to determine the effectiveness of certain groups of pesticides under drip irrigation were conducted in the Dry Steppe of Ukraine. The application of the studied drugs took place on the drip irrigation system. To plan research on the use of pesticides under drip irrigation, schemes have been developed to protect row crops: corn, tomatoes, and soybeans. Selected active substances, which are described by translaminar and acropetal movement on the plant, have a systemic nature of action and are highly effective when used in drip irrigation technologies. It is considered that one of the important disadvantages of application of plant protection products with irrigation water is the limitation of application periods by irrigation regimes. The highest efficiency against the main pathogens was observed with the combined method of pesticide application according to the developed schemes. This method involves the use of pesticides together with irrigation water and additional chemical treatment with conventional methods of fertilisation during the growing season. For its part, this allows for preventive treatments in a short time and adjust the timing of treatments depending on the phytosanitary situation

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Cultivation of nightshade family crops (Solanaceae) requires sufficient amount of moisture and heat. In Ukraine, the most available conditions for that are in the southern regions: Kherson, Mykolaiv, Odesa, Zaporizhia and AR of Crimea, where the average yield of tomatoes is about 30 t/ha, and planting area is about 470 thousand hectares. Tomatoes are the main host plants for the South American tomato moth. Leaves, fruits and vegetative buds damaged by these pests, become a kind of «gateway» for the infection of plants by fungal pathogens. Feeding of phytophagous on the fruits of tomato leads to their falling off. Yield losses can reach 100%. This pest has high adaptability to climatic and natural conditions, capable for reproductive activities throughout the year. Among the factors contributing to the spread of these pests at the intercontinental level, the most important is the uncontrolled trading of infected fruits with plant particles, and the local spread from one field to another due to the ability of adult moths to fly. The searching of scientifically grounded methods of control of South American tomato moth, in particular, the study of the effectiveness of modern insecticides by means of spraying and drip application along with applying irrigation against this pest in the Steppe of Ukraine is very actual. During the phytosanitary evaluation of experimental plots of tomatoes before treatment with insecticides, a high number of larvae of South American tomato moth was found, which in the check plots averaged 3,1-7,0 number/plant before the first application of insecticides, and 9,1-20,6 number/plant before the second one. Insecticide Exirel, SE (cyantraniliprole 100 g/l) with the consumption rates of 1,0 l/ha and 1,5 l/ha when providing double spraying in a small-plot experiment on open ground tomatoes provided the effectiveness against tomato moth caterpillars at 91,1% and 99,5% on the 3rd day after application, and the duration of its toxic effect exceeded 14 days. In the conditions of protected soil when applying the insecticides along with drip irrigation the insecticide Verimark CS (cyantraniliprole, 200 g/l) with the rates of 0,5 and 0,75 l/ha provided the effectiveness against tomato moth caterpillars in 3 days after application on the average by 92,4-100,0%, and the duration of its toxic effects was more than two weeks. Applying insecticides along with drip irrigation due to their local application provided high efficiency of insecticides against phytophagous larvae, having a rather long duration of toxic effect, compared with spraying.

Modern fruit growing involves the use of drip irrigation systems. The methodology for diagnosing of drip irrigation terms appointment and calculation of irrigation rates require continuous improvement on the basis of the introduction of measuring instruments. These issues are relevant for the commercial fruit growing of the world's most common perennial crop -apple trees (Malus domestica Borkh). The purpose of the experiment was to optimise drip irrigation regimes and to analyse the evapotranspiration (ET) of an apple tree depending on the methods of drip irrigation terms appointment. For comparison, four methods were applied: 1) the digital iMetos ECO D2 soil moisture station, 2) the tensiometric method, 3) the Penman-Monteith calculation, and 4) the visual method. The control was irrigation-free treatment. The results of the experiment confirmed the effectiveness of the use of drip irrigation for the cultivation of an intensive apple orchard at the Steppe of Ukraine. According to the parameters of the drip irrigation regime and the yield of apple trees, the use of the iMetos ECO D2 soil moisture station was determined as the most effective method of drip irrigation terms appointment. In this treatment, the irrigation rate was 650 m 3 ha -1 , the crop evapotranspiration (ЕТс) value 3.25 thousand m 3 ha -1 , the water consumption coefficient 83.4 m 3 t -1 , the irrigation efficiency 20.7 m 3 t -1 , and the marketability of apples was 93%. It was found that the removable fruit ripeness parameters: tissue density, sugar content, and degree of starch degradation, were within the sanitary norms of apple quality. This method is defined as the most water-saving, based on the experimental data on irrigation rate and crop productivity. Thus, it is recommended for the use in apple production in the South of Ukraine.