Sept, i, 1921 
Transmission of Some Wilt Diseases in Seed Potatoes 843 
averaging 14 per cent (Table VI and fig. 7). The larger losses in this 
area occur in general in the hotter, irrigated sections. Oregon is included 
with an estimated loss of about 1 per cent. 
Table VI .—Effect of Fusarium-wilt on the yield of potatoes in the western United States 
in igiy (12) 
State. 
Production in 
1917. 
Estimated loss from 
Fusarium-wilt. 
Washington .. . 
, Bushels. 
9,875,000 
8,100,000 
t c. oo.t 0no 
Bushels . 
Per cent. 
Oregon ... . .. 
California . . 
1, 691, OOO 
2,607,OOO 
Idaho... 1 
6,084,000 
30 
!5 
Nevada . ; . 
Utah .. ;. 
Of ■ LU Jf 
540, OOO 
Arizona . . . 
4 j 04 /> 
420, OOO 
1,276,000 
New Mexico . 
4/> °°o 
Total .. 
48, 432, OOO 
6, 336, 000 
0 14 
' ? ‘ * . 
a Average. 
Fusarium radicicola has been secured from potatoes in nine counties of 
the State (fig. 8). It, too, is seemingly of common occurrence, but is 
apparently of little importance to potato production here. . It has not 
been reported as a cause of wilt in other places and evidently does not 
often cause any wilt of the plants in Oregon, though the fact that it has 
