LITERATURE CITED. 
(1) Byabs, L. P. 
1914. A destructive nematode introduced into the United States. 
(Abstract.) In Phytopathology, v. 4, p. 45-46. 
(2) 1920. A nematode disease of red clover and strawberry in the Pacific 
Northwest. In Phytopathology, v .10, p. 91-95, pi. 6-7. Litera- 
ture cited, p. 95. 
(3) Godfrey, G. H. 
1922. The stem and bulb-infesting nematode in America. (Abstract.) 
In Phytopathology, v. 12, p. 52-53. 
(4) Massalongo, C. 
1915. Appunti di zoocecidologia Italica. In Marcellia, v. 14, p. 3-10. 
(5) McKay, M. B. 
1921. A serious nematode disease of strawberry and clover in Oregon. 
In Oreg. Agr. Exp. Sta. Crop Pest and Hort. Rpt, 1915/20, p. 
139-144, pi. 10-11. 
(6) 1922. Occurrence of Tylenchus dipsaci on alfalfa in Oregon. (Ab- 
stract.) In Phytopathology, v. 12, p. 105. 
(7) 1922. Distribution of Tylenchus dipsaci on wild strawberry in Oregon. 
Preliminary report. (Abstract.) In Phytopathology, v. 12 
p. 445-446. 
(8) Piper, Charles V., and Beattie, R. Kent. 
1915. Flora of the northwest coast, xiii, 418 p. Lancaster, Pa. 
(9) Smith, Ralph H. 
1919. A preliminary note concerning a serious nematode disease of red 
clover in the Northwestern States. In Jour. Econ. Ent, v. 12, 
p. 460-462. Bibliography, p. 462. 
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