Show benzene Is Useful to Control Pest An effective method of controlling the plum tree borer that Is also Inex Ine Inexpensive inexpensive pensive has been developed by the zoology entomology department of the South Dakota experiment station The new nev remedy Is simple and Its estimated cost Is not in excess of 3 Prof cents per tree according to George I. I Gilbertson of the depart ment meat Ordinary paraffin Is melted and or P. P D. D B. B Is adder added at the rate of one part to nine parts of paraffin A thin coat of this solution solution one one pint to every four or orfie brushed on the five fi trees trees trees-Is Is then trunks and larger lar cr branches of the trees When It hardens the paraffin paraffin-P. P. n-P. D. D B B. B combination forms a protective coat cont I which does not chip off oft In summer temperature and which allows the dissolved dissolved dis dis- solved P. P D D. D B. B to vaporize slowly anti and enter the tissue of the borer horer and kill it The fumigating action continues s for several se da days s 's until the larvae of the borer are dead This his method Is believed to be the I first fir t practical and effective control l lI ever produced during two decades of I research |