312 Report of the Assistant Horticulturist op the 
TABLE B. 
Light vs. Dark-Skinned Varieties. 
Row 1 
2 
3 
4 
Row 6 . . 
7.. 
8. . 
9. . 
10. . 
SEED. 
Y White Star free from scab 
J v'.'i t 
Total number of tubers and average per 
cent scabby 
- Red-skinned seedling free from scab . 
Total number of tubers and average per 
cent scabby 
i 
2 
J2 
a> 
f 
O 
<n 
a 
umb 
scab 
rQ O 
B 2 
ft 
ft 03 
17 
20 
46.9 
20 
21 
49.7 
39 
15 
66.8 
14 
11 
56 
14 
23 
37.8 
97 
yu 
Ol . 4: 
1 
18 
5.2 
2 
17 
10.5 
3 
7 
30 
3 
20 
13 4 
10 
11 
47.6 
19 
73 
21.3 
In the above table B, each row contained four hills planted with 
medium sized tubers entirely free from scab. The data obtained 
show that the product of the light-colored tubers contained nearly 
thirty per cent more scabby tubers than that of the dark-colored. 
Also that an increased percentage of scabby tubers accompanied 
an increase in the jiel<t. 
Fungicides as a Preventive of Scab. 
The following experiments were made to determine the efficacy of 
various substances to prevent the potato scab. Tubers treated with 
hyposulphite of soda, sulphate of iron, mercury chloride and sulphur, 
were planted in eight-inch pots filled with potting soil and placed in 
the greenhouse February 17. The method of treatment and the results 
are given in the following table: 
