202 



Mycologia 



due to abnormal quantities of acids in the soil, may be prevented 

 by the application of calcium carbonate. — The smuts of the 

 Tilletia group appear to be more nearly related to the rusts than 

 those of the Ustilago group. — The present range of the chestnut 

 canker, Diaporthe parasitica, is from Saratoga County, N. Y. 

 and Suffolk County, Mass., to Westmoreland County, Pa. and 

 Greenbriar and Preston Counties, W. Va. — A very large part of 

 the potato rot in the United States is due to Bacillus phytoph- 

 thorus Appel. 



The Central American banana blight, which has become very 

 serious in recent years, may be retarded in its early stages by 

 replacing diseased plants with healthy ones, but the hope of 

 continuing the banana industry in affected districts lies in the 

 substitution of an immune Chinese variety for the Martinique 

 variety now commonly cultivated. — Lettuce sclerotiniose may 

 probably be eradicated by the early destruction of affected plants, 

 thus preventing the formation of sclerotia. — An anthracnose of 

 red clover (Gleosporium caulivorum) spreads rapidly during 

 warm, showery weather when succulent growth is produced. — It 

 is probable that ascospore infection is, in most cases, largely re- 

 sponsible for early attacks of apple scab on the leaves and 

 petioles. — It has been found that Polystictus hirsutus Fr. may 

 slowly attack the cambium of mountain ash, gradually killing the 

 tree. — It is possible that there are two banana diseases in tropical 

 America confused, one due to bacteria and the other to a 

 Fusarium. 



The appearance of Mycogone perniciosa Magnus in mushroom 

 beds in Pennsylvania introduces a serious menace to mushroom 

 growing in America. — Phytophthora Cactorum, long known to 

 ginseng growers in Japan, has appeared in Ohio and New York, 

 and has been successfully isolated and inoculated into ginseng 

 plants. — Floret sterility of wheat in the Southwest is largely due 

 to rusts and associated fungi, chiefly an undescribed species of 

 Stemphylium, distributed by minute insects and the wind at the 

 period of flowering. — A new disease of the tomato plant, due to 

 Bacterium (?) michiganense E. F. Smith, has been found preva- 

 lent in the vicinity of Grand Rapids, Mich. — The use of sulfur 

 to control potato scab in California has resulted in injury to the 



