94 
Journal of Agricultural Research 
Vol. XXV, No. a 
1920 on Long Island; 1921), Bliss Triumph strain L (1919; 1920 on P 
farm), and Bliss Triumph strain R. In one case (Green Mountain 
strain C) a slightly mosaic part yielded a little better than a no-mosaic 
part. The spindling-tuber disease decreased the yield rate where present 
in Green Mountain strain L (1920 and 1921). In this strain growth on 
Long Island was accompanied by a greater reduction in yield rate by 
mosaic than on P farm. 
Tabu? XXIV. 
Yield tests on effect of mild mosaic and spindling-tuber disease within 
strains 
Strain. 1 
Green Moun¬ 
tain L. 
Bliss Triumph 
L. 
Green Moun¬ 
tain S. 
Green Moun¬ 
tain W. 
Green Moun¬ 
tain C. 
Bliss Triumph 
R. 
Year. 
Part. 
Area . 1 2 
1918 
fRogued of 11 per cent mosaic.. 
\A 11 mosaic. 
Acre. 
V. 
A 
% 
1919 
fRogued of 20 per cent mosaic... 
< 20 per cent mosaic. 
[All mosaic. 
Rogued of 15 per cent mosaic.. 
Rogued of 21 per cent mosaic. . 
21 per cent mosaic, on P farm.. 
50 per cent mosaic. 
fa 
fa 
l 
I1920 < 
12 per cent mosaic, all spind¬ 
ling tuber. 
All mosaic on P farm.’. 
TU 
Vs 
rr 
ft 
fa 
X 
1 
% 
k 
1 L 
1921 < 
1918 < 
16 per cent mosaic on Tong 
• Island. 
,A 11 mosaic on Long Island.... 
’36 per cent mosaic and about 
30 per cent spindling tuber. 
All mosaic and about 30 per 
cent spindling tuber. 
All mosaic and all spindling 
tuber. 
Rogued of 15 per cent mosaic. . 
.All mosaic. 
1919 ^ 
Rogued of 20 per cent mosaic... 
20 per cent mosaic. 
All mosaic. 
Rogued of 26 per cent mosaic... 
44 per cent mosaic. 
1920 ( 
21 per cent mosaic on P farm... 
All mosaic on P farm. 
1918 < 
Rogued of 13 per cent mosaic. 
.45 per cent mosaic. 
/9 
2 
(1919 - 
j Rogued of 30 per cent mosaic... 
168 per cent mosaic. 
A 
A 
fa 
fa 
A 
fa 
A 
A 
A 
1920 < 
fRogued of 22 per cent mosaic. . 
I89 per cent mosaic. 
{1919 « 
fRogued of 32 per cent mosaic... 
I30 per cent mosaic. 
fo.2 per cent mosaic. 
• 1920 < 
[6 per cent mosaic. 
- 1920 < 
fRogued of 2 per cent mosaic... 
[7 per cent mosaic. 
Yield rate. 
Barrels per 
acre. 
89 
69 
3 104 (130) 
144 
122 
83 
65 
146 
96 
68 
75 
53 
84 
100 
60 
84 
82 
3 84 (97) 
86 
3 112 (160) 
133 
106 
>56) 
147 
Pounds 
per hill. 
1-35 
•93 
1.97 
2. 00 
1. 09 
1. 11 
•97 
.78 
1. 9 i 
• 58 
1. 22 
. 82 
i.34 
1.14 
1.17 
1. 09 
i- 3 i 
1.10 
1.79 
i-75 
i-47 
i- 55 
1. 69 
1. 26 
1 Each strain was divided in the year previous to the first given here, by hill selection or by part being 
rogued. 
2 Area given is approximate and on Aroostook Farm unless otherwise stated. 
8 Yield rate in parentheses is that calculated fox 100 per cent assuming the rogued percentage to have been 
a directly proportional loss. 
