No. 3, October, 1921] PATHOLOGY 253 



1546. Massey, L. I\I. Experimental data on losses due to crowncanker of rose. Phyto- 

 pathology 11: 125-134. 1921. — Ojihelia rcses were grown under glass in infested and non- 

 infested soil during a period of 3 years. A record was kept of the plants showing infection 

 and of the number of blossoms produced. Plants becoming infected with the canker fungus 

 {Cylindrocladium sroparium) were not killed outright, but were weakened and produced fewer 

 blossoms than healthy plants. In this experiment the average decrease was about 10 blossoms 

 per plant. — B. B. Higgins. 



1547. Neger, F. W. Die Krankheiten unserer Waldbaume und wichtigsten Gartenge- 

 holze. [The diseases of our forest trees and most important garden shrubs.] viii + 280 p., 

 2S4fig. Ferdinand Enke: Stuttgart, 1919. — After a short introduction the author presents his 

 material in 2 main divisions. The 1st part treats diseases resulting from frost, heat, lack 

 of or too much light, disturbance of the water balance, lack of or too much nutrient, poisonous 

 gases, smoke, atmospheric disturbances such as wind, snow, lightning, etc., and mechanical 

 iiijuries. The 2nd part opens with a general discussion of immunity, susceptibility, infection, 

 host reaction, and control of parasitic diseases, and then takes up bacterial diseases, fungous 

 diseases, and the injuries caused by lichens and parasitic phanerogams. The data on any 

 particular disease are presented from the symptomatic standpoint, but short keys on the myco- 

 logical differences of the parasitic species within a given genus are inserted whenever neces- 

 sary. Footnote references to pertinent literature, in many cases accompanied bj' abstracts 

 of the results obtained by the investigators cited, are used frequently. At the end of the book 

 concise symptomatic descriptions of the diseases discussed in the text are given under the name 

 of the host. — Reginald H. Colley. 



154S. Wolf, F. A., and S. G. Lehman. Notes on new or little known plant diseases in 

 North Carolina in 1920. Ann. Rept. North Carolina Agric. Exp. Sta. 43 : 55-58, 1920 [1921].— 

 The authors mention Phoma corvina on cotton following injury by lightning, and a root mold, 

 Penicillium spiculisporum, described in Mycologia 12: 1G8-174. 1920; pod rot of cowpeas 

 caused by Choanephora cucurbitarum; pod blight {Diaporthe phaseolarum) of lima beans; 

 fig anthracnose {Glomerella cingulata); soft rot of peppers {Pythium de Baryanum); mosaic, 

 anthracnose {Glomerella cingulata), and Phoma blight {Phoma sp.) of soy bean; buckeye 

 rot {Phytophthora terrestria) of tomato; and downy mildew {Peronospora viciae) of vetch, — 

 F. A. Wolf. 



THE HOST (RESISTANCE, SUSCEPTIBILITY, MORBID ANATOMY AND 



PHYSIOLOGY 



1549, Adams, J. F, Observations on wheat scab in Pennsylvania and its pathological 

 histology. Phytopathology 11: 115-124. PI. 2-3, fig. 1. 1921. — Under Pennsylvania condi- 

 tions wheat {Triticum sativum) seedling infection by Gibber ella saubinetti is comparatively 

 unimportant. Head infection is much more prevalent, occurring in all the wheat-growing 

 centers of the state. The majority of infections occur when the kernels are in the "milk" 

 stage and injury is usually confined to 1 or 2 spikelets of a head. The kernels in such spike- 

 lets are conspicuously shriveled. The fungous mycelium apparently enters through the 

 germinal end of the seed; and from this point, it spreads throughout the interior. The en- 

 dosperm usually fails to develop. The embryo is entirely disorganized and replaced by a 

 mass of intertwining mycelium. Apparently the mycelium does not spread through the rachis 

 from one spikelet to another. In heads artificially inoculated during the flowering stage, 

 the ovules failed to develop. — B. B. Higgins. 



1550, Anderson, H, W, Some factors influencing the practical control of blister canker 

 in apple orchards. Proc. Amer. Soc. Hort. Sci. 17: 111-11(5. 1920 [1921]. — This is a report of 

 investigations in Illinois orchards. The important factors in the etiology of the fungus 

 are source and manner of infection and the life of the fungus in the host. The sources of in- 

 fection are ascospores, conidia, and mycelium. Due to "(1) their immunity from injury by 

 ordinary weather conditions, (2) their long vitality, (3) their ability to infect readily when 



