Show traps painted green capture most beetles traps painted green proved most effective in a 0 series of tests conducted by the united states department of agriculture to determine if japanese beetles have color preferences forty four traps were used in n tile the test which lasted for 16 days for every beetles captured in the green traps traps painted other colors caught iee beetles les as follows brown 93 03 yellow S 80 red 81 blue 70 76 orange 70 76 unpainted CO 69 white 65 indigo nelgo CO black 52 purple 50 four were painted each color rind four were left gnp unpainted af during the test tes t each cadi trap was moved to a new spot t every other day so that no color find an advantage over another in respect to location |