The behaviour of cyantraniliprole was studied in a lysimetric experiment. The experiment was carried out at the lysimeters of the Soil Research Station of Moscow State University from June 2015 to December 2018. The soil of lysimeter is soddy-podzolic silt loam. The insecticide was applied at the recommended and tenfold rates in 2015 and 2016. The maximum depth of migration of cyantraniliprole in the soil profile was 35 cm in October 2015 and 40 cm in October 2016. Cyantraniliprole was found in the leachate of lysimeter water 2 weeks after its first application in 2015 and continued until the end of 2018, that is, 2 years after the last treatment. Cyantraniliprole was found in most of the water samples analyzed. The maximum concentrations of cyantraniliprole in the leachate were 12.5 and 2.6 μg L−1 in lysimeters with tenfold and recommended doses, with mean values of - 1.7 and 0.6 μg L−1, respectively.

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The predisposition of the region to groundwater pollution by pesticides depends on climatic and soil factors, characteristics of the aquifer system, the type of the territory management, physicochemical properties of used pesticides and timing of their application. The applying of computer models for vulnerability assessment allows to consider the influence of factors affecting the migration of substances through the soil profile. Agricultural districts of Russia were grouped by basic climatic parameters -average annual temperatures and rainfall. 9 large regions with uniform climatic characteristics were obtained. The combination of climatic and soil parameters of each region made up a standard scenario, which was implemented as input files to the pesticide fate model PEARL. As an indicator of the vulnerability of groundwater to pesticide contamination, we used the predicted weighted average annual pesticide concentrations in leachate at a depth of 1 m. Calculations showed the highest vulnerability was in Nizhny Novgorod, Moscow, Pskov, Vladivostok, intermediate one - in Novosibirsk, and the lowest ones - in Kurgan, Saratov, Kursk and Krasnodar.

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