Show sodium umi arsenate ar sen ate quite ite efficient poison has proved to be satisfactory t for grass hopper bait paris green and white arsenic have long been used as the standard poisoning agents la in grasshopper 1 baits As a consequence most farmers have have become familiar with these materials they know that desirable results can usually be obtained that being the case most farmers are not prone to make a change to other materials they always ask the he question why change to sodium arsenic when I 1 can get results with parts green or white arsenic jarib d green reen bostl costly rails paris green besides being hard to mix Is entirely too expensive for economical poisoning therefore should be eliminated white arsenic Is cheap enough but due to the care required to get the polson poison evenly distributed in the balt bait it Is often difficult for the geld field worker to obtain a perfect mixture when the mixture la Is imperfect erratic results are sure to be had bad the possibilities of arsenical poisoning are also greater ahen one works with white arsenic extensively IN advantages sodium nr tir senate la Is free from the above criticisms and has proved to be a most satisfactory and eff efficient lelent poison it has tho the following edvan tares pa 1 it Is cheap reducing the cot coat of poisoning to a minimum 2 it Is easy to mix inix the cli chances ances of an imperfect mixture are reduced 1 3 it Is soluble therefore every eve ry hake flake of bran moistened is pol poisoned doing awny away with possible erratic r results 4 this material Is poison and must not be taken internally but due to its liquid state stafe there Is less lesi possibility of being poisoned it than with wih white arsenic where large quantities of dustpan dust cani can be breathed 5 it Is easy to measure and handle 0 atas it Is efficient experiments show it to be entirely effective when properly applied george S langford office of Color colorado rido state stae entomologist |