test chemicals treated plants are held in the greenhouse and seven days later mortality is determined for both the adult mites and the nymphs hatching from eggs which were on the plants at the time of treatment test concentrations range from 0 05 down to that at which 50 mortality occurs test chemicals are dissolved in acetone and aliquots are diluted in 200 cc of water in glass bottles two pinto bean plants phaseolus sp with expanded primary leaves are supported in each bottle by cotton plugs so that their roots and stems are immersed in the treated water the plants are then infested with 75 100 two spotted mites of various ages and sexes one week later the mortality of the adult mites and nymphs is recorded test concentrations range from 10 ppm down to that at which 50 mortality occurs the results of these tests on the compounds listed in table i are shown in table ii below table ii__________________________________________________________________________insecticide activity approximate ld sub 50 values hf 2smcompound hf gr lb ba bas smc baw tbw mos soil pe eggs sysnumber u03bcg 25 u2640 ppm ppm ppm ppm__________________________________________________________________________1 5 008 003 001 10 01 03 03 08 1 lt 05 lt 05 gt 102.