46 



James Stewart Wiant 



Eliminating, then, those treatments which caused appreciable injury, 

 it is of interest to note the differences that occurred in the final stand of 

 healthy seedlings (figure 4). In general, plats treated with mercuric 



Figure 4. final stand of norway-spruce seedlings in plats treated with liquid 



applications of chemicals 

 The numbers below the columns refer to the treatment numbers given in table 14 



chloride and aluminum sulfate yielded the greatest number, and those with 

 Uspulun the lowest, while sulfuric acid and Semesan ranged between these 

 two. 



The results of experiment B indicate that both aluminum sulfate and 

 sulfuric acid were effective in considerably reducing the incidence of disease. 



Norway spruce — Treatments with dry chemicals. Copper carbonate 

 and several organic mercury dusts were used in seed and soil treatments 

 on both spring- and fall-sown beds of norway spruce in 1926. The results 

 were similar to those on red pine, which was included in the same plats. 

 Since these tests have already been discussed under red pine, they are not 

 considered in detail here. It will be recalled, however, that soil applica- 

 tions of the mercury dusts gave rather promising results on the spring- 

 sown beds. 



