20,2  #Leeand Shino: Citrus-canker Control Experiments 14] 
TABLE 11.—Total cost of control measures in each plat calculated per tree. 
Pat cs | Same | taker 
No. Treatment. (trom rials, 3| spray-| Total. 
3). sprays.) ing. 
Sen Sen Sen. | Sen. 
1 | Removal of sources of infection only -...-.----..-..---..-.. A OE AE AEE 59.6 
2 | Infection sources removed; lime sulphur 1-40, 3 sprays_-_.-- 59.6 05.0 25.5 90.1 
3 | Infection sources removed; Bordeaux 4-4-50, 3 sprays____-- 59.6 07.0 25.5 | 92.1 
4 | Infection sources removed; neutral Bordeaux, 8 sprays ....| 59.6 05.1 25.6} 90.2 
5 | Infection sources removed; Burgundy 3-3-50, 8 sprays---_-- 59.6 07.1 25.5 | 92,2 
> | Piprays;limewulpnor 100s... os so oa sac cea ccec eee ge 05.5 25.5 | 81.0 
41S wpreyes, Rordequx 66-002. .< cocci ae se eh 08.1 25.5 | 383.6 
By Reprage, Dowmilends wewbeel 26 cis iste e0 En eh stews fs ie 08.2 25.5 | 38.7 
Ot BOTA eO, Tere amie Bp se en cle 06.9 25.5 | 32.4 
Ret IND CROMGINEN 6 og oe eek x eneee ate cap aduageapalpagedcus ele cop Aeesubaselasencaue 
2.18 epeage, Formalin@1-1000 oo ohds cake sd wc 74.6 25.5 | 100.0 
12 | No treatment 
13 | Pruning to remove infection sources; 3 sprays, Bordeaux 10.4 | 05.2 25.5 | 41.1 
neutral, 
14 | Pruning to remove infection sources; 3 sprays, Burgundy | 10.4, 06.7| 25.5) 42.6 
3-3-50. 
15 | Pruning to remove infection sources; 3 sprays, lime sul- 10.4 05.2 25.5) 411 
phur 1-40. : 
16 | Pruning to remove infection sources; 8 sprays, Bordeaux 10.4 08.2 25.6 | 44.1 
4-4-50. : 
17 | Pruning to remove infection sources; no other treatment} 10.4 |-...----|-------- 10.4 
18-F NG treatment. 2% 6 ocuc ec eos Shes SS eee Se Gee cs Fe eg oe een SEP er a 
19 De ae Sus F Reseed Gee ee 
For the purpose of aiding those who wish to convert these 
costs into terms of American currency, the following comments 
are necessary: 
The Japanese yen varies in value but is usually nearly equiv- 
alent to 50 cents United States currency; the sen is 0.5 cent 
United States currency. Japanese labor is not so efficient as 
American labor; it required five men to operate a hand-power 
spray pump with two lines of hose, which would be operated by 
three men in America. The Japanese laborers worked only six 
hours a day, whereas an American farm laborer would work 
at least eight, and more often nine or ten hours a day. A sled 
drawn by a cow was used as a conveyance for the spray pump; 
horses were not available. For the hire of the cow, 3 yen was 
paid for a six-hour day. This mode of conveyance was, moreover, 
extremely slow. The cost of spray materials in Japan is as 
high as, or probably in most cases higher than, the same supplies 
at most points in America. Those interested can, therefore, 
