THE FIELD TESTING OF COPPER-SPRAY COATINGS. 7 
CELERY AT BRADENTOWN, FLA. 
Figure 4 shows the behavior of Bordeaux mixture on celery at 
Bradentown, Fla., in February and March, 1918. Each grower 
_ prepared and applied the mixture in his own way to plantings of 
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Fig. 4.—Field tests for copper on celery leaves. Four fields were sprayed by the owners with Bordeaux 
mixture supposedly made up in each case with 6 pounds of bluestone in 50 gallons. A hypothetical 
safety zone is indicated between the 35 and 45 milligram tests. The actual determinations are indi- 
cated by O, the estimated interpolations by X. 
1 or more acres. In every case the grower claimed that 6 pounds 
of bluestone were used in 50 gallons of the Bordeaux mixture. Knap- 
sack sprayers were used. With the exception of field D one or 
