6 N. H. AGE. EXPERIMENT STATION. [Bulletin 161 



made Bordeaux plots. Considering both effectiveness in controlling 

 scab and safety from injury to the foliage and fruit the results 

 obtained with the 3-4-60 and the 4-4-50 home made Bordeaux were 

 more satisfactory than with any of the other fungicides. 



In 1908 the spraying experiments were continued in the same 

 orchards. Some of the Bordeauxs that had given the best results the 

 preceding season were used alongside various sulfur mixtures. 



The self-boiled lime-sulfur was prepared according to the direc- 

 tions of W. M. Scott* of the Bureau of Plant Industry, U. S. De- 

 partment of Agriculture. For the preparation of the 15-10-50 mix- 

 ture fifteen pounds of fresh stone lime were placed in a fifty gallon 

 barrel and two or three gallons of water were poured over it. Ten 

 pounds of sulfur were immediately added and a few gallons more 

 of water. The heat from the slaking lime soon boiled the mix- 

 ture violently. Burning was prevented by thorough stirring. If 

 the mass became too thick to stir, more water was added, but the 

 water was kept at a minimum in order to secure the maximum of 

 heat for cooking the mixture. The barrel was covered with a piece 

 of gunny sack to check the escape of the heat. The boiling con- 

 tinued from 20 to 30 minutes. After the boiling had ceased the 

 solution was diluted to fifty gallons for use. 



The 9-6-50 self-boiled mixture was prepared by diluting a portion 

 of the 15-10-50 solution. The unboiled lime and sulfur solution Mas 

 prepared by mixing dilute lime and sulfur paste solutions. No heat 

 was applied and the mixture was merely a mechanical one. 



Two commercial lime-sulfur solutions were used, one prepared by 

 the Thomsen Chemical Co., of Baltimore, Md., and the other by the 

 Niagara Sprayer Co., of Middleport, N. Y. The specific gravity of 

 the two stock solutions was approximately the same. As actually 

 applied to the tree, one gallon of the former wag diluted to 25 gal- 

 lons and one gallon of the latter to 50 gallons. The contrast in re- 

 sults obtained should be credited to the difference in dilution and 

 not to a difference in the brands of lime-sulfur used. 



The first spraying was made May 15, before the flower buds had 

 opened, the second May 27, when the blossoms had mostly fallen, 

 the third June 10, the fourth June 18, and the fifth July 30. Paris 

 green was used at the rate of 6 oz. to 50 gals, in the second 

 and fourth sprayings. Notes were taken on the drops on August 



* Scott, W. M. Self -boiled lime sulfur mixture, as a promising fungicide. Bur. of 

 Plant Ind. U. S. Dept. of Agri. Cir. 1, 1008. 



