/ 



June 2, 1920.] 



Agricultural Gazette of N.S.W. 



441 



The bluestoiie paste should- be prepared according to the following 

 formula : — ih lb. copper sulphate (bluestone), 4 lb. unslaked lime, li gallons, 

 of water. The lime should be slaked and brought to a pasty condition with 

 portion of the water ; the bluestone should be completely dissolved ' in" the 



A diseased tree dying with " collar rot." 



remainder of the water, after which the two solutions should be mixed. If 

 the paste dries a little on standing it should be brought to the necessary 

 thinness again by the addition of a little more water. It may be an. 

 advantage, instead of replacing the contaminated earth, to put a littleclean 

 sand around the trunk after completing the treatment. 



A healthy tree in the same block. 



In cases where collar rot is too far advanced for the tree to be saved by 

 this treatment it should be removed and burned, and the stump hole then 

 dry-limed before replanting the gaps. In such cases it would be advisable 

 to paint the new tree with bluestone paste around the "collar" prior to 

 planting. 



