the top of the trap was just above the height of the vegetation for each test the traps were placed in a randomized complete block and treatment positions were rerandomized each time traps were checked traps were about 3 m apart in each block and two replicate blocks were 30 to 45 m apart pheromone was dissolved in hexane and appropriate quantities of each solution were pipetted onto a 4 5 cm diameter whatman no 1 filter paper disc just prior to baiting the traps the filter paper bait was fastened just below the top edge of the sticky surface of the panel ca 3 20 to 4 30 p m each day the results of six replicates of this experiment are reported in table i the procedure of example 3 was repeated with the racemic 10 m 2 t and the natural pure pheromone each applied at 1 u03bcg in 25 u03bcl of hexane on the filter paper a hexane blank was included as a control the test was run for 3 days with two randomized blocks due to high volatility of both the natural and synthetic pheromones attraction to the traps lasted only about 20 min after baiting table i______________________________________ex a mean u00b1 se sup 2ample pheromone source mount sup 1 scr males trap replicate______________________________________3a unpurified volatiles 1 u03bcg 21 8 u00b1 1 5 a3b unpurified volatiles 3 u03bcg 42 8 u00b1 5 1 b3c natural pure 1 u03bcg 22 4 u00b1 2 0 a pheromone3d racemic synthetic 2 u03bcg 29 0 u00b1 4 2 a 10 m 2 t______________________________________ sup 1 amount.