MORE IMPORTANT WKITINGS OX HOP APHIS. 39 
1912. Sanderson, E. D. — Insect Pests of Farm. Garden, and Orchard, pp. 275-278, 
figs. 202-204. 
On hop. 
1891. Washburn, F. L.— Bui. 10. Oreg. Agr. Exp. Sta. ; pp. 23-24. figs. 5. 
Description and treatment. 
1893. Washburn, F. L.— Bui. 25. Oreg. Agr. Exp. Sta.. pp. 9-12. 
Treatment. 
1894. Washburn, F. L— Bui. 31. Oreg. Agr. Exp. Sta., pp. 79-88, 3 rigs.. 2 pis., 
April. 
1894. Washburn, F. L.— Bui. 31. Oreg. Agr. Exp. Sta.. p. 82. April. 
Brief notes, with suggestions as to remedies. 
