DISEASES OF PLANTS. 49 



regions. The author holds that this is probably due to the peculiar conditions 

 there which influence host and parasite and their mutual i-elations in ways as 

 yet but little known. 



Problems and results in. the biological study of fungi, H. Klebahn 

 (Vortrdge Gesam. Geb. Bot., Deut. Bot. Oesell., No. 1 {1914), pp. 41, fl9»- 15).— 

 This is a bibliographical discussion of certain phases of relation between 

 parasites and parasitized plants as illustrated by examples taken. 



Pathological plant anatomy, E. KtJSTEB, trans, by Frances Dorkance ( IDor- 

 ranceton, Pa.]: Translator, 1913, pps. XIV +258+19) .—This is a mimeographed 

 translation of a book previously noted (E. S. R., 15, p. 373). 



A conspectus of bacterial diseases of plants, E. F. Smith (Ann. Missouri 

 Bot. Gard., 2 {1915), No. 1-2, pp. 377-401) .—Besides a list of families showing 

 those attacked by one or more bacteria, a discussion is given of the period of 

 greatest susceptibility of the hosts, various influences as related to infection, the 

 incubation period, action and reaction between parasite and host, recovery, 

 extra-vegetal habits of parasites, their prevalence and geographical distribution, 

 and control methods. 



Beport of the division of plant pathology and bacteriology, H. R. Fulton 

 {North Carolina Sta. Bien. Rpt. 1913-14, pp. 32, 33).— This is a brief account 

 of various lines of investigations carried on by the department. In connection 

 with the plant-disease survey, the chestnut blight fungus was found in a nursery 

 in Guilford County in June, 1912. The infected trees were destroyed, and it is 

 believed that the disease is temporarily under control. 



Notes on some fungus diseases, E. S, Salmon and H. Woemald {Jour. 

 Southeast. Agr. Col. Wye, No. 22 {1913), pp. 450-456, pis. 2, figs. 2).— A further 

 discussion is given of a disease of apple buds previously noted (E. S. R., 30, p. 

 852), which attacks several varieties named in varying degrees, and perhaps 

 other fruits as well as berries. The casual organism has not yet been identified. 



It is thought probable that the sowing of celery seed bearing Septoria petro- 

 selini apii may be the principal means by which celery blight is distributed. 

 It is recommended that infected seedlings be dipped in Bordeaux mixture when 

 transplanting them. A number of commercial samples of celery seed have been 

 found to be badly infected. 



White root rot {Dematophora necatrix, RoselUnia necatrix) was noted as 

 persisting on apple and gooseberry on ground where cherry trees had previously 

 stood. 



It is stated that Mycosphcerella brassicicola, considered to be the perfect stage 

 of a conidial form, Phyllosticta hrassicce, causing a leaf spot on certain crucifers, 

 has been found in the Mycosphserella stage showing mature ascospores on leaves 

 of cabbage and broccoli. 



Report of the imperial mycologist, F. J. F. Shaw {Rpt. Agr. Research Inst, 

 and Col. Pusa, 1913-14, pp. 48-61). — The main portion of this report relates 

 to diseases of plants. 



The most important enemy of rice {Tylenchus angustus) is active here from 

 July to December, culminating in September or October. It has been known to 

 withstand desiccation for 15 months. Transplanted rice is comparatively im- 

 mune to natural attack. Burning the stubble may be the best means of protec- 

 tion. Sclerotium oryzce has been found to attack rice in Burma, Madras, Bihar, 

 and Orissa. 



Colletotrichum falcatum, causing red rot of sugar cane, is successfully resisted 

 by a hybrid between a local cane and foreign varieties of greater size and 

 yield. A disease somewhat similar as to .symptoms and mode of control is due 

 to Cephalosporium saceliari. A collar rot is ascribed to Hendersonina sacchari 

 and a disease caused by Helminthosporium sacchari which produces but 



