Tomato, a fruit vegetable of great international importance, suffer damage from Western flower thrip(Frankliniella occidentalis), and their vectored viral pathogens that cause devastating viral diseases such as tomato spotted wilt disease. Farmers utilize various pesticides to control F. occidentalis. However, abuse of pesticides leads to development of resistance in the targeted F. occidentalis populations. In this situation, pesticide resistance evaluation data for suggesting efficient F. occidentalis control regimes is a critical necessity. Therefore, this study evaluated five types of pesticides (Acrinathrin 5.7% SC, Dinotefuran 20% WG, Emamectin benzoate 2.15% ME, Chlorfenapyr 5% EC and Fluxametamide 9% EC) for pesticide resistance in F. occidentalis strains collected from tomato greenhouses located in Pyeong-taek, Cheol-won, Hoeng-seong, Gim-hae and Po-hang. Acrinathrin showed significantly low or no pesticidal effect on every strain of F. occidentalis, with over a thousand times higher LC90 value compared to the recommended doses. Also, significantly high resistance ratios were recorded in treatments with Dinotefuran when compared with Emamectin benzoate, Clorfenapyr and Fluxametamide. The LC90 values of Emamectin benzoate ranged between 1 time higher and 10 times lower than the recommended doses against all strains. Gim-hae strain showed susceptibility to Clorfenapyr with lesser LC90 value than recommended doses. However, the LC90 of the Cheol-won strain was 16386.64 times higher than the recommended doses of Clorfenapyr. Hoeng-sung and Gim-hae strain showed no resistance to Fluxametamide. The likely reason to explain these significant differences of pesticide resistance in F. occidentalis by location could be the independent preference and prior choices of pesticides by farmers.