Aug. 15,1925 
Soil Disinfection for Potato Wart 
313 
0-1-0 
KEROS 
0- 11-38 
CARBOL 
0-2-0 
KEROS 
100-12-32 
CARBOL 
0-3-0 
OIL 
0- 13-67 
CARBOL 
0-4-0 
S 
0- 14-84 
CARBOL 
0-5-0 
<5 
6-15-0 
javel . 
0-6-0 
S 
0-16-4 
JAVEL 
0-7-0 
S 
0-17-37 
JAVEL 
0-8-0 
S 
0-18-50 
JAVEL 
0-9-0 
CLEANS 
0- 19- 0 
CLEAN’G 
0- 10-0 
CLEAN’G 
0- 20-0 
CLEAN’G 
ARRANGEMENT OF 
CHEMICAL PLOTS 
PL0TS*5X10 FT. 
EXPLANATION OF 
FIGURES - 
UPPER LEFT * %OF 
WART IN 1921. 
UPPER RIGHT-%OF 
WART IN 1922. 
CENTRAL* PLOT NO. 
LETTERSaTREATMENT 
"C"AT SIDE * WART IN 
CHECK POTS. 
0-4 
21 
WO 
BDX 
0-0 
26 
SOD 
CAR 
0-0 
22 
WO 
BDX 
0-0 
27 
L-S 
0-0 
23 
KER 
0-0 
28 
L-S 
0-0 
24 
OIL 
0-0 
29 
L-S 
0-0 
25 
SOD 
CAR 
0-0 
30 
WK 
0-0 
31 
BttX 
0-0 
38 
BtfX 
0-0 
45 
WK 
0-13 
32 
S’LT 
0-0 
39 
S’LT 
4-14 
46 
QUA 
SUL 
0-0 
33 
SOD 
FLU 
0-0 
40 
SOD 
FLU 
0-14 
47 
QUA 
SUL 
0-4 
34 
PYR 
AC’D 
0-0 
41 
PYR 
ACt> 
0-0 
48 
KER 
3-0 
35 
POT 
PER 
0-0 
42 
FOR 
0-0 
49 
Hg 
h 2 o 
3-0 
36 
POT 
PER 
0-0 
43 
BDX 
0-0 
50 
Hg 
H 2 0 
0-0 
37 
COP 
SUL 
0-0 
44 
Hg 
SND 
0-0 
51 
CAL 
CHL 
84-IOq 
52 
WO 
BDX 
0-0 
54 
L-S 
0-0 
56 
L-S 
0-0 
58 
Hg 
Hz 01 
80401 
53 
WO 
BDX 
0-4 
55 
FOR 
0-0 
57 
SOD 
CAR 
0-0 
59 
SOD 
CAR 
0-0 
70 
BRX 
0- 60-01 
Hfc+HzO 
0-61-01 
FORMAL 
0-0 
71 
BRX 
0-62-0 
FORMAL 
0-0 
72 
S’LT 
11-63-141 
PYR.AC?D 
0-64-56 
PYR.ACt) 
0-101 
73 
S‘LT 
0-0 
74 
SOD 
FLU 
0-0 
75 
SOD 
FLU 
5-0 
76 
BDX 
96-65-20 
POT.PER 
67-66-20 
POT.PER 
0- 67-0 
COP. SUL 
4-68-0 
BDX 
0-0 
69 
BDX 
0-0 
77 
H < + 
S'LT 
0-0 
78 
Hg + 
S’LT 
0-0 
79 
Hg + 
S’LT 
0-0 
80 
SOD 
CHR 
0- 06 -0 
H<+S’LT 
0-87-0 
Hi+S'LT 
0- 88-0 
CHL.LIM 
0- 89-0 
Hg + S’LT 
0-90-0 
FORM. 
0-91-0 
CHL.LIM 
0- 92-27 
POT.CAR 
0-0 
81 
0-93-0 
U 1 
POT 
KER 
PER 
3-94-0 
0-0 
CHK 
82 
19-95-20 
CHK 
CHK 
0-0 
4-96-14 
83 
CHK 
0-97-0 
CHK 
BORAX 
0-0 
0-98-0 
84 
SOD.FLU 
Hg 
S*ND 
0- 99-0 
0-0 
COP. SUL 
85 
0-100-0 
COP 
H*+S’ND 
SUL 
Fig. 3.—Diagrammatic drawing showing arrangement of plots in each of the four gardens used, together 
with the chemicals used and the results for two years. The various chemicals are indicated as follows: 
Bichloride of mercury, Hg; Borax, Brx; Bordeaux mixture, Bdx; Woburn Bordeaux, Wo Bdx; Car¬ 
bolic acid, Carbol; Chloride of lime, Cal Chi or Chi lim; Cleaning solution, Clean’g; Copper sulphate. 
Cop Sul; Formaldehyde, For, Form, or Formal; Javelle water, Javel; Kerosene, Ker or Keros; Lime- 
sulphur, L-S; Crude oil, oil; Potassium carbonate. Pot Carb; Potassium permanganate, Pot Per; Pyro¬ 
ligneous acid, Pyr acd; Qua-Sul, Qua Sul; Sodium carbonate. Sod car; Sodium chloride. Sit; Sodium 
chromate. Sod Chr; Sodium fluoride, Sod Flu; Sulphur, S; commercial weed killer, W K 
Sand, sand and water, HaO, were used with bichloride of mercury in some plots. Chk=Check plot. 
For formulae and applications see Table III, p. 314. Before The plots were treated, two pots were filled 
with composite soil from each. C at the side of a plot indicates that wart was produced on the potato 
plant grown in one or both check pots for that plot. For a discussion of the value of these check pots 
see p. 316 and Table IV 
