136 N. H. AGR. EXPERIMENT STATION [Bulletin 144 



once thoroughly settled it can never be got into as fine a state 

 of division again. While the physical condition of the old Bor- 

 deaux is not all that could be desired, it is far better than that of 

 the average patent mixture, and if the difficulty of frequent 

 preparation prevents the use of home-made Bordeaux the depre- 

 ciation with age should not be too greatly emphasized. 



A method for making a Bordeaux that will not spoil with 

 standing has recently been reported by Kelhofer.^ The modifica- 

 tion consists in the addition of sugar in the proportion of 3i/^ 

 ounces to each 50 gallons of Bordeaux. He found that after 

 standing more than a year a mixture prepared in this manner 

 would hold the copper hydroxide precipitate in suspension as 

 well as fresh Bordeaux. Some recent experiences in England 

 would indicate that if an insecticide is to be added to the Bor- 

 deaux mixture, attention must be given to the possibility of 

 killing the bees by the sweetened solution. 



Lime-Sulfur. The importance of lime-sulfur as an insecti- 

 cide and its growing favor as a fungicide have caused consid- 

 erable attention to be given to its preparation in recent years.^ 

 The following is a very satisfactory formula : 50 pounds best 

 stone lime, 100 pounds sulfur, water enough to make 50 gallons 

 of solution at finish. The quantities may be proportionately 

 reduced as desired. 



Place the fresh stone lime in the kettle or other vessel to be 

 used and slake slowly. Put in the sulfur, mixing it thoroly 

 with the slaked or slaking lime, adding enough water to main- 

 tain a thin paste. Any lumps of sulfur or lime should be thor- 

 oly broken up. When slaking and mixing are completed 

 the solution may be diluted to 50 gallons. Boil for about one 

 hour, with occasional stirring. If the boiling has been sufficient, 

 the sulfur will have entirely gone into solution, having combined 

 with the lime to form a clear reddish-yellow compound. Enough 

 water should be added to replace that lost in boiling, bringing the 

 quantity of the solution to 50 gallons again. The solution is now 

 ready to be diluted for use. For summer application on the 

 apple orchard each gallon of this lime-sulfur should be diluted 

 to 20 or 25 gallons. 



> Kelhofer, Von W. Uber einige Qeslchtspunkte bel der Herstellung der Bordeaux- 

 brUhe. Zeitsfhrift f?tr Pflanzenkrankheiten. 3: 65-74. 1908. 



'Stewart, John P. Concenlraled I.ime-Sulfur: Its Propertie.s, Preparation and 

 Use. Pa. Agr. Exp. Sta. Bull. 92. 1909. 



