Lately my Christmas trees are infected by some funny fungus. Talking to  
other tree growers with the same problem they used Neem oil sprays last  year 
and their trees cleared up. I plan to spray Neem oil 2T/Gallon this year.  
Last year I used CS & Baking Soda sprays which did not work.  Interesting 
they say Neem oil on toenail fungus morning and night will clear up  that 
fungus also. It is said to work for sinus fungus problems also, 2 drops  daily.
Brickey