STEM NEMATODE ON WILD HOSTS. 
3 
of 1922. While these surveys -were not by any means exhaustive, 
they covered typical localities and a considerable range of territory 7 . 
The results of the various surveys indicate that the stem nematode 
occurs definitely on one host or the other throughout practically the 
entire length of the Oregon coast line and in at least Pacific County 
in Washington. In addition, it occurs inland in Willamette Valley 
at various points. The 
southern limit is not 
definitely known for 
either host. On Fra- 
garla ehiloensis it is 
abundant in Coos 
County and also from 
there northward to 
the northern end of Til- 
lamook County, where 
it apparently ceases. 
Hypochmris r a die at a 
was found to be affected 
in the southern part of 
Lincoln County and 
northward, beyond the 
range of the diseased 
wild strawberries, into 
Washington. It was 
also found at Hillsboro, 
St. Joseph, McMinn- 
v i 1 1 e . and Corvallis, 
Oreg. 2 At the last 
point it occurred in 
considerable abundance 
on the campus of the 
Oregon Agricultural 
College. Material from 
this source was used 
for photographs (PL 
II ) and for preserving. 
Cultivated strawberry 
fields were found in- 
fested to an extent that 
was of rather serious 
economic importance in 
Coos and Lane Counties and to a minor degree at Corvallis in Benton 
County. The distribution of the disease on its various hosts is shown 
on the map. (Fig. 1.) 
Pig. 1. — Map of western Oregon and southwestern Wash- 
ington, showing- the distribution of the stem nematode 
{Tylenchus dipsaci) on cultivated strawberries (O), 
on wild strawberries ((%), and on the false dande- 
lion (X). 
APPARENT INDEPENDENCE OF THE TWO HOSTS* 
During the course of these surveys several interesting facts were 
brought out in connection with an apparent lack of any correlation 
- During the summer of 192."> the nema disease was found in Hypochaeris radicata 
in great abundance at different points on Puget Sound, Wash., througbout the length of 
Willamette Valley, Oreg., and southward along the coast as far as San Francisco, Calif. 
