308 PATHOLOGY [BoT. Absts., Vol. VIII, 



a "complete manual for growers," with the following plan of presentation. The book is 

 divided into 11 "sections," distributed in 3 "parts": — Sect. 1, Introduction; Sect. II, How 

 fruit trees live. Part i, Insect pests and their control: Sect. Ill, About insects; Sect. IV, 

 Insect pests; Sect. V, Insecticides; Sect. VI, Beneficial insects. Part ii. Fungus diseases 

 of fruit and their control: Sect. VII, Fungus diseases; Sect. VIII, Fungicides. Part iii, 

 Spraying in theory and practice: Sect. IX, Spraying appliances and methods; Sect. X, 

 Spraying calendar; Sect. XI, Tables and appendices. Pests are considered by groups, and 

 for each pest the data are presented in simple language in accordance with a standard outline. 

 The first 476 pages of the book are used in the discussion of insect pests and their control. 

 Fungus diseases of the apple, cherry, currant, gooseberrj/, hop, peach, pear, plum, raspberry, 

 strawberry, and grape are considered in the following 151 pages. In the case of each fungus 

 disease the data are presented wherever possible in a standard manner similar in plan to the 

 scheme used in the section on insect pests. The description of spraying methods and outfits 

 is comprehensive. The last 2 sections in the book are arranged so that the grower may easily 

 find information on the spraying calendar or the tables of equivalents. — Reginald H. Colley. 



2113. Griesbeck, a. Die Erreger der Schwartxbeinigkeit bei Kartoffeln. [The causes 

 of blackleg in potatoes.] Flihling's Landw. Zeitg. 69: 37-38. 1920. — While Appel found 

 Bacillus phytophthorus to be a cause of blackleg in potatoes he indicated that other organisms 

 might contribute to the disease. The present author found that hollow places in the earth 

 beside the potato stems caused by burrowing animals such as mice and moles were associated 

 with the appearance of the disease. It is supposed that injury to the stem or merely the exis- 

 tence of the hollow space beside the stem causes dying of the tissues and gives access to moulds 

 and rotting bacteria. It is suggested that hoeing to break up the animal burrows would cause 

 partially affected stems to recover and that ridding the land of these burrowing animals 

 would effectively control the disease. — A. T. Wiancko. 



2114. Mabee, W. B., and R. A. Jehle. Insect pests and diseases of apples in North 

 Carolina and their control. Bull. North Carolina Dept. Agric. 192P:l-24. 1921. — A popular 

 illustrated account of apple scab, blotch, blackrot, bitter rot, sooty blotch, rust, stippen, 

 and fire blight of apples, with remedial and control measures. — F. A. Wolf. 



2115. Norton, J. B. S., and C. C. Chen. Another corn seed parasite. Science 52: 250. 

 1920. — A fungus which seems to have been given little consideration as a parasite has recently 

 been isolated by the authors from sweet corn seed. The fungus was frequently found in corn 

 from a field that had manj'' dwarf, distorted, and barren stalks, and some root rot. The fungus 

 has been isolated and its pathogenicity tested. The tests show the same effects as in the field. 

 The fungus corresponds very well with descriptions and figures of Oospora verticilloides. 

 It is probable that the fungus has been recorded under other names. — A, H. Chivers. 



2116. NowELL, W., and C. B. Williams. Sugar cane blight in Trinidad. [Reprint 

 of Bull. Dept. Agric. Trinidad and Tobago 19, part 1. 1920.] Internat. Sugar Jour. 23: 

 154-155. 1921. — The fungi causing root disease of sugar cane, at present known in Trinidad, 

 belong to the genera Marasmius and Odontia. They occur to some extent in all cane fields 

 and become serious when the vigor of the cane is decreased by adverse factors. The preva- 

 lence of root disease over wide areas in Trinidad, reported last year, is due to the weakening 

 of the cane by attacks of froghopper. The effect of root disease with or following froghopper 

 injury prevents recovery of the cane. Control measures suggested are the reduction of the 

 ratooning period, improved cultivation, manuring, and rotation of crops. — C. Rumbold. 



2117. Poeteren, N. van. De Aardappelwratziekte. [Potato wart.] Tijdschr. Plantenz. 

 27: 1-13. Fig. 1-7. 1921. — A general discussion of potato wart (Chrysophlyctis endobioiica) , 

 including symptoms, cause, mode of dissemination, importance, distribution in general and 

 in Holland, eradication, and legislative measures in Holland for the eradication of the disease. 

 Distribution of this disease in Holland is limited to 5 townships which are located on the Ger- 



