EXPERIMENT STATION T.r I.l-ETINS. .'.C.'.t 



spniy in coiiihiiiation with lead aiseiialo, as a soluble arsenate is likely to 

 be foVmed which will cause burning of the foliage. 



Later Sherwiu-AYilliams Co., Cleveland. Ohio, placed on the market a 

 dry lime.-sulfur compound. In this preparation, sulfur is cond)ined with 

 linie in the same ratio as it exists in the commercial lime-sulfur solutions. 

 It mav be used for both winter aiul summer spraying. The average of four 

 samples analyzed during the past two years shows 52.4^2 per cent total 



sulfur. 



Both of these i)re])arations have been widely advertised during the ])ast 

 two or three years and. therefore, demaml more than' passing noiice. Tlic 

 chiim is made by the nmnufacturers that 10 to 14 pcmmls of these dry 

 preparations dissolved in 50 gallons of water are etpiivalent to (H^i gallons 

 of lime-sulfur solution testing 33° Baume. Let us see if these claims hold 



true. 



A barrel, or 7)0 gallons, of lime-sulfur solution testing 33=' Baun^c 

 weighs approximately GOO pounds and by analysis has been fouml to con 

 tain 2G per cent snlfur and 10..")0 per ce'nt lime (CaO). Consequently a 

 1)arrel of such solution would contain MO pounds of sulfur and r..", pounds 

 of lime or a total of 21!) pounds of dry matter. In other words, a barrel 

 of lime-snlfur solution testing 33° Baume would yield, on evaporation, 

 approximately 210 ixninds of dry lime-sulfur. Now ()t ^ gallons or one 

 eighth of the barrel, would contain tiie eipiivalent of 27 pounds of dry 

 lime-sulfur. Since the comnwrcial dry lime-sulfur is prepareil by lirsi 

 making the .solution and then i'vai)orating the water it is not reasonable to 

 believe that a given amount of the dry material will bo any more eriicieni 

 when dissolved in water than it was in the oiigimil solution l»('roi(' ilic 

 water was evaporated. 



The process of making the dry sodium-sulfur c(uup«»und is dillereni 

 from that employed in making the dry lime-sulfur but since it contains 

 practically the same amount of snlfur, the same numb«'r of pounds should 

 be used to be equivalent to 014 gallons of .solution testing ^i:}" Baume. 



The preceding comparison is based upon the assumption that the-diy 

 pre])arations will i»e entirely soluble in water. This, however, is vciy 

 seldom true especially if tlu' i)ackages liave been open for any length of 

 time. In nearly every sample examined we have f<Mind a small ainomii 

 of insoluble residue which was found to l»e sulfur. 



It is now gemu-ally recommended that "jlv, gnllons of .3;'. Baume lime 

 sidftir sidution be used for dormant s]n'aying. Based upon the analyses of 

 several samples of dry preparations 20 pounds sjionld be used in 50 gallons 

 of water to make a solution of e<iuivalent strength. 



The dry ])r(q)arations made by the Niagara Sprayer ( 'o.. and Sherwin 

 Williams Co., have been taken as examides of the two most common sub- 

 stitutes for lime-sulfur sidiition. AVhat has been said of them will apjily 

 also to the same jn-oducts made by other companies. 



In addition to the ])re]>arations referred to in the foreg(»ing discussion, 

 mention should be made of the prodtict known as "B T S" manuracTured 

 by the(Jeneral Chemical Co., New York. N. Y., (formerly Th<»msen Cham 

 leal C<». I. Although none of this has been found in the State it is undcM- 

 st(«)d to be a combinaticui of barium and sulfur, and. as in the foregoing 

 cases, its efficiency should be figured (»n the basis of the total s<duble 

 sulfur. 



