1905.] PUBLIC DOCUMENT — No. 33. 31 



place at the same time through the same tree ; and that, 

 under normal conditions, — that is, when no great electrical 

 disturbance is taking place, — some species of trees always 

 conduct the electricity to the air from the earth, while other 

 species conduct electricity from the earth to the air. It is 

 not at all unlikely that in the vicinity of large trees there 

 is exhibited a detrimental influence on crops, and vegetation 

 in general, to an extent which cannot be accounted for by 

 the lack of sunshine and soil moisture. 



Some Important Literature relating to Diseases, etc., 

 OF Crops not generally believed to be caused by 

 Fungi or Insects. 



The publication by Dr. W. C. Sturgis^ of a host index 

 relating to economic fungi has proved of great value to 

 students, and to those interested in the literature pertaining 

 to fungous diseases of our important cultivated crops. Un- 

 fortunately, the host index of Dr. Sturgis does not include 

 those troubles generally termed physiological, or those of 

 an unknown nature. 



The following list is compiled to supplement his host index 

 to literature pertaining to fungous diseases. It is by no 

 means complete, but includes at least some of the more 

 important publications of the agricultural experiment sta- 

 tions and United States Department of Agriculture relating 

 to functional and unknown disorders. 



Apple (Pirus malus, L.) . 

 Baldwin Fruit-spot, Brown-spot. — N. Y. (Geneva) Agr. Exp. Sta., Bull. No. 



164, 1899, pp. 215-219. Vt. Agr. Exp. Sta., Rept. 1899; 1900, pp. 159-164. 

 Frost-blisters (Leaves). ~'N.Y. (Geneva) Agr. Exp. Sta., Bull. No. 220, 1902, 



pp. 217-224. See Quince. Mass. Hatch Exp. Sta., Rept. No. 15, 1903, pp. 



32-34. 

 Frost-cracks (Fruit) . — Yt. Agr. Exp. Sta., Bull. No. 49, 1895, p. 100. See Pear. 

 Rosette. — Col. Agr. Exp. Sta., Bull. No. 69, 1902, pp. 4-6. 

 Scald.— Yt. Agr. Exp. Sta., Rept. 1896-97, pp. 5.5-59; also 11th Rept. 1898, pp. 



198, 199. 

 Spraying and Bloom. — 'N. Y. (Geneva) Agr. Exp. Sta., Bull. No. 196, 1900. 

 Spraying Injuries. — N. Y. (Geneva) Agr. Exp. Sta., Bull. No. 220, 1902, pp. 



225-230. 



Apricot (Prunus). 

 Leaf-scorch or Sunburn. — Ariz. Agr. Exp. Sta., Rept. 1898, pp. 163-165. 



1 Conn. (State) Agr. Exp. Sta., Bull. No. 118, 1893; Repts. 17, 1893; 31, 1897; and 24, 

 1900. 



