INSECTS AND FOREST MANAGEMENT — CRAIGHEAD 391 



Hopkins, A. D. — Continued. 



1901. Insect enemies of the spruce in the northeast. U. S. Dep. Agr., Bur. 



Ent. Bull. 28, n. s., 48 pp., 16 plates. 



1902. Insect enemies of the pine in the Blaclc Hills Forest Reserve. U. S. 



Dep. Agr., Bur. Ent. Bull. 32, n. s., 24 pp., 7 plates. 

 1909a. Insect depredations in North American forests and practical methods 

 of prevention and control. U. S. Dep. Agr., Bur. Ent. Bull. 58, 

 pt. 5, n. s., pp. 57-95. 

 1909b. Bark beetles of the genus Dendroctonus. U. S. Dep. Agr., Bur. 

 Ent. Bull. 83, pt. 1, 165 pp., illus. 

 Keen, F. P. 



1931. Pine beetle control costs reduced through logging and salvage. U. S. 



Dep. Agr. Yearbook, pp. 428-430. 



1936. Relative susceptibility of ponderosa pines to bark beetle attack. 



Journ. Forestry, vol. 34, No. 10, pp. 919-927. 



1937. Climatic cycles in eastern Oregon as indicated by tree rings. U. S. 



Dep. Agr. Monthly Weather Rev., vol. 65, pp. 175-188. 

 Keen, F. P., and Ftjkniss, R. L. 



1937. Effects of subzero temperatures on populations of the western pine 

 beetle. Journ. Econ. Ent., vol. 30, No. 3, pp. 482-504. 

 Keen, P. P., and Sai,man, K. A. 



1941. Progress in pine beetle control through tree selection. (Ms. ai>- 

 proved July 15, 1941, for publication in Journ, Forestry.) 

 Leach, J. G., Oke, L. W., and Chbistensen, Ci.tde. 



1934. The interrelationships of bark beetles and blue-staining fungi in the 

 felled Norway pine timber. Journ. Agr. Res., vol. 49, No. 4, pp. 

 315-341. 

 MacAloney, H. J. 



1932. The white-pine weevil. U. S. Dep. Agr. Circ. 221, 30 pp. 

 Mtt.t.kr, J. M. 



1931. High and low lethal temperatures for the western pine beetle. 

 Journ. Agr. Res., vol. 43, No. 4, pp. 303-321, 3 figs. 

 MOSHEB, F. H. 



1915. Food plants of the gypsy moth in America. U. S. Dep. Agr., Bur. 

 Ent. Bull. No. 250, 39 pp. 

 Nelson, Ralph M. 



1934. Effect of bluestain fungi on southern pines attacked by bark beetles. 

 Phytopathol. Beitschr., vol. 7, No. 4, pp. 327-353. 

 Nelson, Ralph M., and Beal, J. A. 



1929. Experiments with bluestain fungi in southern pines. Phytopathol., 

 vol. 19, No. 12, pp. 1101-1106. 

 Patterson, J, E. 



1929. The pandora moth, a periodic pest of western pine forests. U. S. 



Dep. Agr. Techn. Bull. 137, 20 pp., illus. 



1930. Control of the mountain pine beetle by solar heat. U. S. Dep. Agr. 



Techn. Bull. No. 195, 20 pp., 11 figs. 

 Pearce, W. J. 



1920. The relation of insect losses to sustained forest yield. Journ. For- 

 estry, vol. 18, No. 4, pp. 406-411. 

 Peakson, G. a., and Wadsworth, F. H. 



1941. An example of timber management in the Southwest. Journ. For- 

 estry, vol. 39, No. 5, pp. 434-452. 



