546 EXPERIMENT STATION RECORD. 



Endothia parasitica were found on normal bark below lesions in numbers up 

 to 172,222 per square centimeter. Of the 36 pieces of bark tested only 5 failed 

 to yield positive results, and of these 4 were collected 14 days after a rain. 

 Viable pycnospores were found in 23 of 24 tests made during December and 

 January, when no spore horns were present in the field. Abundant viable 

 pycnospores were obtained at 70 cm. (about 27 in.) below a bark lesion. 

 Although most tests were made one or two days after a rain, positive results 

 were obtained with cultures from 5 of 9 pieces of bark tested 14 days after 

 0.56 in. of rain had fallen. 



The chestnut bark disease on freshly fallen nuts, J. F. Coluns {Phyto- 

 pathology, 5 (1915), No. 4, pp. 233-235, fig. i ) .—Attention was calle<l by the 

 author to the occurrence of chestnut l)ark disease on old nuts and burs in 

 1912 (E. S. R., 30, p. 543). Later freshly fallen nuts were found showing 

 blister-like excresences, and cultures were made from some of these, and 

 trees inoculated from some of these cultures. 



The data obtained in these experiments indicate that nuts are .sometime.s 

 infected with this disease before they fall from the tree, and that it would be 

 within the range of possibility to introduce the disease in a new locality by 

 means of discarded shells or kernels of (lisease<l nuts. 



Methods of injecting trees, Caroi.ink Rumbolo (Phytopathology, 5 (1915), 

 No. Jf. pp. 225-228. pi. 1). — The autlior describes the methods used in injecting 

 various chemicals into trees in connection with the inve.stlgatlons carrie<l on 

 for the control of the chestnut blight. 



Boot rot of coniferous seedlings, A. H. Gr.wes (Phytopathology, 5 (1915), 

 No. Jf, pp. 213-217, figs. 2). — The author reports the appearance in the nursery 

 of the Yale Forest School, during the spring and summer of 1914, of a serious 

 root rot. About 20 per cent of a bed of one-year-old re<l pines (Pinus re.'<inoKa) 

 were destroyed, while 5 per cent of a bed of one-year-old white pines (P. 

 atrolins), several thousand two-year-old red pines, as well as a few seetllings 

 of one-year-old hemloclv (Tsuga canadensis) succumbed. 



The disease first became noticeable through a dark retl or reddish-brown dis- 

 coloration of the tips of the leaves. By slow degrees this color was extended 

 and subsequently became brown or yellow brown. Diseased seedlings were 

 examined and showed a root system entirely dead. 



Repeated efforts were made to isolate a fungus without success, but a study 

 of the soil beds showed that the soil was stiff and clayey. This, together with 

 the fact that the disease caused most destruction early in the season and dis- 

 appeared when drier conditions prevailed, has led to the conclusion that it is 

 due to the lack of oxygen in a soil which is saturated with water. 



Razoumofskya tsugensis in Alaska, .T. R. Weik (Phytopathology, 5 (1915), 

 No. ff, p. 229). — Tlie author reports A', tsiigcn.iis as attacking Tsuga hcterophylla 

 in the Tongass National Forest, Alaska. 



Fomes juniperinus and its occurrence in British East Africa, E. M. Wake- 

 field (Roy. Hot. Gard. Kew, Bui. .Uwc. Inform., No. 3 (1915), pp. 102-104. fig- 

 /). — The author describes two specimens of F. juniperinus from East Africa, 

 which is said to be the worst enemy of cetlars growing indigenously on the 

 drier slopes at altitudes of 7,000 to 9,000 ft. This organism is said to agree 

 with the description of that noted by von Schrenk (E. S. R.. 12, p. 765) as 

 attacking red cedar in the Unittxl States. 



Telial stage of Gymnosporangium tubulatum on Juniperus scopulonim, 

 .T. R. Weir (Phytopathology, 5 (1915), No. 4, p. 218). — As the result of culture 

 experiments, the author shows that J. scopulorum bears the telial stage of 

 G. tubulatum. 



