456 EXPERIMENT STATION RECORD. [Vol.38 



189). — Pines at Kosconimon {Pinus potiderosa aud P. contorta, but not Scotch 

 pine) were found in 1914 to be infected witli a blister rust, the Peridermium 

 comptoniw stage attacl<ing almost every seedling pine, some of which died. 

 Myrica asplcnifolia showed on its rusted leaves the pustules of the uredospore 

 and the tcleulospore stage of C. comptonice. The teleutospores infect the pine 

 seedlings, the mycelium growing slowly under the bark two or three years, the 

 hypertrophy also developing very slowly. ^Ecidiospores produced by the Peri- 

 dermium stage on the pine infected the sweet ferns during the spring or early 

 summer. It is considered possible that the rust is harbored by one or more of 

 the native pines. 



[Rubber diseases], R. D. Anstead (Planters' Chron., 11 {1916), No. 50, pp. 

 628-630). — This is a very brief acount of observations on pink disease of rubber, 

 by the author and by W. McRea, and on the good effects of Bordeaux mixture 

 employed in this connection, with an account of preliminary steps taken to 

 inaugurate experimentation on five estates totaling 900 acres. 



Abnormal leaf fall of Hevea rubber, R. D. Anstead (Planters' Chron., 12 

 (1917). No. 5, pp. 5^-56). — A program has been drawn up aud circulated to the 

 several estates undert iking the study of the leaf fall diseases of rubber. The 

 treatment which is to be thus tested includes the removal of all branches 

 which have died back, also the previous year's fruits and fruit stalks ; the 

 collection and destruction of all leaves, fruits, twigs, and branches found on 

 the ground ; and the removal of all fruits by June 1 to 10. An alternative to 

 this treatment is the removal by June 1 of the flowers and any stray fruits 

 which may have developed from flowers overlooked. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Principles of economic zoology, L. S. and M. C. Daugherty (Philadelphia 

 and London: W. B. Saunders Co., 1917, 2. ed., rev., pp. IX+428, figs. 302).— A 

 second edition of the work previously noted (E. S. R.. 30, p. 52). 



Game laws for 1917, G. A. Lawyer, W. F. Bancroft, and F. L. Earnshaw 

 (U. S. Dept. Agr., Farmers' Bui. 910 (1917), pp. 70). — The usual annual sum- 

 mary of the provisions of Federal, State, and provincial statutes, the provisions 

 having been arranged mainly by States and Provinces. 



Laws relating to fur-bearing animals, 1917, D. E. Lantz (U. S. Dept. 

 Agr., Farmers' Bui. 911 (1917), pp. 31). — This is the usual summary of laws in 

 the United States and Canada relating to trapping, open seasons, propagation, 

 and bounties. 



Control of the jack rabbit pest in Nevada, R. A. Ward (Agr. Ext. Univ. 

 Nev. Bui. IS (1917), pp. 11, fig. 1). — This is a discussion of the necessity of 

 organized community and farm campaigns, crops destroyed by rabbits, and the 

 ways and means of rabbit extermination. 



Control of the California ground squirrel, J. Dixon (California Sta. Circ. 

 181 (1917), pp. 14, figs. 3). — This is a popular account which gives a brief 

 description of the California or "digger" squirrel (Citellus beecheyi and .sub- 

 species) and measures for its control. It is pointed out that the five most 

 effective methods of destroying these squirrels are (1) poisoning with strych- 

 nin; (2) fumigation with carbon bisulphid ; (3) trapping; (4) shooting; and 

 (5) encouragement of the natural enemies. Carbon bisulphid is most effective 

 when the soil is damp; strychnin-coated barley is best used during the dry 

 season ; trapping and shooting are effective at any time, but are from six to 

 twelve times more so before the young are out, before April 1, than later in 

 the season. Powdered strychnin (sulphate) in fresh vegetables and fruit is 

 specially effective in the dry season when green food is scarce. 



