The use of a polymeric solubilizer for increasing the soil mobility of a sparingly soluble insecticide, wherein the polymeric solubilizer has the property that the active insecticidal ingredient in a 1% by weight aqueous solution of the polymeric solubilizer at 25°C and 1.01325 bar has a solubility at least forty times higher than under the same conditions in pure water, and wherein the weight ratio of active ingredient to solubilizer is ≤ 1, and wherein the solubilizer is selected from groups A1, B1 and D: A1. hyperbranched polycarbonates in which the hyperbranched polycarbonate is bonded to at least one linear or comb-type polymer and/or at least one functional C 1 -C 24 unit comprising an acid group, an amino group or at least two hydroxyl groups; B1. vinyllactam copolymers obtainable from B1-1. 60-99% by weight (based on the overall copolymer) of 5-7-membered 1-vinyl-2-lactam and B1-2. 1 to 40% by weight of at least one monomer selected from the group of the B1-21 C 8 -C 30 -alkyl esters of monoethylenically unsaturated C 3 -C 8 -carboxylic acids, B1-22 N-alkyl- or N,N-dialkyl-substituted amides of acrylic acid or of methacrylic acid having C 8 to C 30 -alkyl radicals, B1-23 vinyl esters of aliphatic unbranched C 8 -C 30 -carboxylic acids, B1-24 the C 8 -C 30 -alkyl vinyl ethers, where the percentages by weight of the individual components add up to 100% by weight; D. copolymers based on ethylenically unsaturated dicarboxylic mono- and diesters, obtainable from D1 at least one monomer from the group of the olefins, vinyl ethers and styrene and D2 at least one monomer from the group of the mono- and diesters of ethylenically unsaturated dicarboxylic acids, where the alcohol group of the ester has a structure of the formula (R 10 -O) n - (R 11 -O) p -R 12 where the symbols and indices are each defined as follows: R 10 is 1,2-propylene or 2,3-propylene; R 11 is ethylene; R 12 is H, unbranched or branched C 1 -C 40 -alkyl, phenyl, phenyl substituted by C 1 -C 20 -alkyl, benzyl, benzyl substituted by C 1 -C 20 -alkyl; n is an integer from 0 to 140, and p is an integer from 0 to 100, where the sum of n and p is at least 1. A1. hyperbranched polycarbonates in which the hyperbranched polycarbonate is bonded to at least one linear or comb-type polymer and/or at least one functional C 1 -C 24 unit comprising an acid group, an amino group or at least two hydroxyl groups; B1. vinyllactam copolymers obtainable from B1-1. 60-99% by weight (based on the overall copolymer) of 5-7-membered 1-vinyl-2-lactam and B1-2. 1 to 40% by weight of at least one monomer selected from the group of the B1-21 C 8 -C 30 -alkyl esters of monoethylenically unsaturated C 3 -C 8 -carboxylic acids, B1-22 N-alkyl- or N,N-dialkyl-substituted amides of acrylic acid or of methacrylic acid having C 8 to C 30 -alkyl radicals, B1-23 vinyl esters of aliphatic unbranched C 8 -C 30 -carboxylic acids, B1-24 the C 8 -C 30 -alkyl vinyl ethers, where the percentages by weight of the individual components add up to 100% by weight; B1-1. 60-99% by weight (based on the overall copolymer) of 5-7-membered 1-vinyl-2-lactam and B1-2. 1 to 40% by weight of at least one monomer selected from the group of the B1-21 C 8 -C 30 -alkyl esters of monoethylenically unsaturated C 3 -C 8 -carboxylic acids, B1-22 N-alkyl- or N,N-dialkyl-substituted amides of acrylic acid or of methacrylic acid having C 8 to C 30 -alkyl radicals, B1-23 vinyl esters of aliphatic unbranched C 8 -C 30 -carboxylic acids, B1-24 the C 8 -C 30 -alkyl vinyl ethers, D. copolymers based on ethylenically unsaturated dicarboxylic mono- and diesters, obtainable from D1 at least one monomer from the group of the olefins, vinyl ethers and styrene and D2 at least one monomer from the group of the mono- and diesters of ethylenically unsaturated dicarboxylic acids, where the alcohol group of the ester has a structure of the formula (R 10 -O) n - (R 11 -O) p -R 12 where the symbols and indices are each defined as follows: R 10 is 1,2-propylene or 2,3-propylene; R 11 is ethylene; R 12 is H, unbranched or branched C 1 -C 40 -alkyl, phenyl, phenyl substituted by C 1 -C 20 -alkyl, benzyl, benzyl substituted by C 1 -C 20 -alkyl; n is an integer from 0 to 140, and p is an integer from 0 to 100, where the sum of n and p is at least 1. D1 at least one monomer from the group of the olefins, vinyl ethers and styrene and D2 at least one monomer from the group of the mono- and diesters of ethylenically unsaturated dicarboxylic acids, where the alcohol group of the ester has a structure of the formula (R 10 -O) n - (R 11 -O) p -R 12 where the symbols and indices are each defined as follows: R 10 is 1,2-propylene or 2,3-propylene; R 11 is ethylene; R 12 is H, unbranched or branched C 1 -C 40 -alkyl, phenyl, phenyl substituted by C 1 -C 20 -alkyl, benzyl, benzyl substituted by C 1 -C 20 -alkyl; n is an integer from 0 to 140, and p is an integer from 0 to 100, R 10 is 1,2-propylene or 2,3-propylene; R 11 is ethylene; R 12 is H, unbranched or branched C 1 -C 40 -alkyl, phenyl, phenyl substituted by C 1 -C 20 -alkyl, benzyl, benzyl substituted by C 1 -C 20 -alkyl; n is an integer from 0 to 140, and p is an integer from 0 to 100,