6 BULLETIN 785, U. S. DEPARTMENT OF AGRICULTURE. 
emulsion, and the Burgundy mixture was also made up with 3 
pounds of bluestone. The tests show consistent decreases in copper 
content of the coatings. 
CITRUS NURSERY STOCK AT BRADENTOWN, FLA. 
At Bradentown, Fla., comparative tests were made with three 
strengths of Bordeaux mixture, made up according to 3-4-50, 
2-23-50, and 1-13-50 formulas. The applications were made in 
SELLA MACS 
27 28 | 22 
oF 
oi 4? 49 os 
SULICOVIS DP COMPL?R PER LOO DIS VPESY MUVOHAST Of LiAMES 
Fic. 3.—Ficld tests for copper on sour-orange leaves. A and D were sprayed with 34~50 Bordeaux mix- 
ture; B and £, with 2-22-50 Bordeaux mixture; and C and F, with 1-14-50 Bordeaux mixture. A, B, 
and C were in Nursery I; D, #,and Fin Nursery I. 
February and March, 1918, on two nursery plantings of overgrown 
sour-orange stock. In Nursery I the trees were about 6 feet high; 
in Nursery II about 3 feet. A bucket spray pump was used, and in 
each nursery measured amounts of spray were applied to equal 
lengths of the nursery rows to secure a distribution of the spray as 
equal as possible. The fresh weight of each leaf sample approxi- 
mated 100 grams. Figure 3 shows the relative agreement of the 
field test results with the strengths of spray applied. Plat F was 
sprayed with the others on February 21, but the first sample was lost. 
