66 CALIFORNIA CITRUS CULTURE. 
The sieve used should be made of brass wire and contain twenty 
meshes to the inch. 
This spray is used on such fungus diseases as wither-tip, brown rot, 
Fic. 46.—An excellent type of a power sprayer costing $350.00. (Courtesy 
Bean Spray Pump Co.) 
Bordeaux Paste. 
1 pound of bluestone (copper sulphate) dissolved in one gallon of water in a 
wooden or earthen vessel. This can best be done by hanging it in a sack 
in the top of the water. 
2 pounds of unslaked lime, slaked in about one half gallon of water. Some 
variation from these proportions may be made without greatly changing 
the value of the paste. 
Stir together when cool, making a hight blue mixture about the con- 
sistency of whitewash. If the mixture turns to some other color before 
being applied, it is an indication that something is wrong. Mix up 
fresh each day or two, as the mixed paste tends to deteriorate with age. 
It may be applied with a large brush as whitewash. A wash made of 
equal parts of lime and sulphur (self-boiled) is also being tried out. 
This may prove equally as good. 
This paste is apphed to the trunks of lemon trees which are affected 
with gum disease. 
Commercial Tobacco Extracts. 
The extract containing two and three quarters per cent nicotine 
should be diluted to sixty parts of water. The extract containing forty 
per cent nicotine should be diluted from one to one thousand parts or 
one to fifteen hundred parts of water. 
