179 



the solution ready to use only when no discoloration ap- 

 pears after the addition of a few drops of the test solu- 

 tion to a small sample of the sprayino mixture. 



The tree employed in our experiment was thoroughly 

 sprayed alx)ut ten days before the buds opened and then 

 at intervals of ten days three more sprayings were given. 

 The dates were as follows : February 26, March 9, March 

 IS, and March 26. Of course the first and all subsequent 

 dates must be determined by the advancement of the sea- 

 son. Although the sprayed tree was in close proximity 

 to unsprayed trees of the same species that were badly 

 injured by the disease, the sprayed tree was only very 

 slightly affected by the disease. More extensive experi- 

 ments must be undertaken before one could say with any 

 certainty that this line of treatment will in all cases be 

 effectual in preventing the outbreak of this disease. But 

 the one positive demonstration of the value of this treat- 

 ment renders it very probable that the disease may be 

 held in check by such treatment as that outlined above. 

 It is expected that further experiments along this line 

 wnll be undertaken during the coming spring with several 

 species of oaks that are known to have had this disease 

 during the present season. 



HOST INDEX OF THE FUNGUS. 



The fungus noA\' under consideration has been reported 

 as occurring on the following species of oaks in the 

 states named. 



Qiiercus alba L. White Oak. Conn. ;5^. J. 



Quercus hrevifolia (liam.) Sargent. Blue Jack. Ala. 

 S. Car. 



Quercus coccinea Muench. N. J. Wise. 



Quercus digitafa (Marsh.) Sudworth. Spanish Oak. 

 Ala. 



