PLAN No. 698. THE BEST BEDBUG PREPARATION
The effectiveness of various exterminators of bedbugs is described in Bulletin 707, issued by the United States Department of Agriculture, Washington, D. C., embodying the results of experiments by the Bureau of Entomology. Hydrocarbon oil sprays (kerosene, gasoline, etc.) were found to be effective against bedbugs, killing, in most cases, 100 per cent within forty-eight hours; coal-tar creosote emulsions were effective, when used undiluted, but their effectiveness fell very rapidly when they were diluted; mercuric chlorid, as a dust and a 6-per-cent-water solution, was found to kill 100 per cent; pyrethrum was found to be very effective, while pyrethrum stems were of little or no practical value; tobacco powders were to be found of little or no value, and hellebore to be absolutely ineffective.
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