MOKE IMPORTANT WRITINGS ON 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 figs., 2 pis., 



April. 

 1894. Washburn, F. L.— Bui. 31, Oreg. Agr. Exp. Sta., p. 82, April. 

 Brief notes, with suggestions as to remedies. 



