Pine Bluff daily graphic., 1911-02-23
By w. D. HUNTER,

V IA
 Bureau of Entomology of the United
 States Department of Agriculture.
 During the season of 1909 a uote- worthy advance was made in the con trol of the boil weevil by means of d poison The credit for this achieve ment belongs to Wilmon Newell of the state crop pest commission of I4oui- Siana. In experiments with paris green for the destruction of the boil weeyl carried on in previous seasons it Was found that d certain number of thein- sects were lilled.s It occurred to Mr. Newell that the llumberreached by the poison would be increased greatly if q. substance much finer than paris green could be obtained !, ArsenAte of lead was the poison that was selected Very large quantities of arsenate of Lead Emay KBe applied to growing plants without any injury whatever. In the use of paris green tie presence of a small amount Of fret arsenic causes cons idera bIe dana gtA t.. cotton plants if it is applied at the i:;t,. of as little as five pounds per ,G:re. Mi Newell succeeded in f,aving ait#tH- tirely new form of arsenate of l.aA mace by one of the manufacturers. of inseclFitlae*s l,tlaSt { 3issafss= E153f E =
 Used as Fine Powder kss
 IT aI' 'fka n Ii ae1c 1icsetii.lgly powder that can be forced into the buds and even into the covering of the squares unbown buds, of the cotton Ii eFH Hx rglf tiSsaH {. comparatively coarse powder like paris greeA Thsa pEeRaraugp pf this forni 6fai }alliissesha ta3of v lead eeeohseau9lfly ob viated two important difficulties thal attended the use of paris green that 3s the danger of burning the plantssb :, lalle slppIcattoas and the difficulty in forcing the substance into the partxot the plants wi.*re it would be taken5Rlp by the insect. Thus the founda tfon vas lqaid for Aeasd greatly laeieasin:;f the mortality that had previously bseil obtained from from thee use 9f. another poi son N 5ln l3o9.t state crop pest commission of Louisiana had thirteen eXperimept;'5 Mith powdered arsenate of lead local :.
 
 forty-six acres. The poison was ap '' piled at from one pound to ffty-on,'a pounds per acre. In different eXperi-i i ,inashts' frdiM faae If6i fteH Abpllcation# were made In all but one of the**,, Iisssa sp'1 liissEssslllld ,sa'a after : dedteeRkthe expense th{nrreas which veslsa fiea few qsa.sSao. < Sg ..s: s2s per
 Esa Hoo Much lPoisss1l Ussds f
 M6isxperinisht which did not re. suit iiu i saalo arl iIrcreas tId of sl21 Tsiai1 ss of @xta,e scotton Ier:astre was obtaiiissE The very large ap,ount of poison used In thisaSgaseg..stf,ffts one pounds per acre, iixelveda astIfh an ex pense that this Increased yield was not sufficient 10 offset it.. :ss
 In the experiments In which from ten to twenty three pounds of the poi son per acre were used in from five to Seven appi.cations the net profit ran from sS.G3 t6' ss:.ssss..54i fer acre. fhe most profitable dmount of the apoisoii t0, he used seems. thus tashe indicated. although the, conclpsiens fr9m the pre.i lininary work may be changed as the result Of future investigations, =, :, .a ]. T At most the poison merely places an.. other means of control at the, command ] of the planters Eserythihgs indicates l that it will be ana important meahss
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