* 
130 The Philippine Journal of Science 1922 
by adding the diluted, recently slaked quicklime in just sufficient 
amount to precipitate entirely all of the copper. Burgundy 
8.250 mixture was always prepared with diluted constituents 
and applied immediately after its preparation. Formalin 1 to 
100 was always applied immediately after its preparation. 
Spray solutions and mixtures were applied with a pump operated 
by hand; the pump was equipped with a pressure gauge and 
pressure was maintained at from 120 to 140 pounds. 
TABLE 4.—Showing cost of labor employed in removal of sources of in 
fection. 
CAREFUL PRUNING, PLATS 1, 2, 8, 4, AND 5. 
Cost at 
6-hour 
Date. Men. Hours. Y 1.20 per’ 
days. day. 
Yen. 
Ddeeiver 30, Wis sooo RS eae A} 2d ll 66 11 13. 20 
2 6 1 1.20 
Desires 00p 1818 sen osc 3s ak | cc eeesl.- 8 56 4779.8 11.20 
1 3 0.5 0.60 
1 4 0.6 0.80 
December 31, 1918 Sits uae neetee eae SUemeen 9 86 6 7.20 
8 12 2 2.40 
i 3 0.5 0. 60 
6 89 6.5 7.80 
January 4, 1919_____.. Coes ee ee 2 9 15 1.80 
Jaruaty 6.1910 Se SY 8 64 10.6 12.80 
QUE cence wos ade ens es ae. 298 49.5 59. 60 
ROUGH PRUNING, PLATS 13, 14, 15, 16, AND 17. 
DOME hs Wr inion Ga hc cc dene. 4 6 1 1,20 
Daluary- 6) 1919s. oo eon ve es ee 3 3 0.5 0. 60 
MBE CFOS eo ee SS ee en 2 1 0.16 0.20 
January 7, 1919. SSC a 8 10 1.66 2.00 
2 6 1 1.20 
Total Mal et a Men My ge NR bar 26 4.32 5.20 
Careful pruning of 100 trees cost 59.60 sen per tree. 
Rough pruning of 50 trees cost 10.40 sen per tree. 
The dates of field operations follow, in Table 5. 
TABLE 5.—Showing treatment of the experimental plats for citrus-canker 
control at Se odasieh Japan. 
Plats 1, 2, 3, 4, 5, pruned December 29, 30, and 31, 1918; January 4 
and 6, 1919. 
Eis ey 14, 15, 16, 17, pruned December 31, 1918; January 5, 6, and 
1919. 
