June, 1920] PATHOLOGY o'). r ) 



lation of split products of starch (Spaltungsprodukte) as sugar, through the presence of which 

 the amylolytic enzyme is rendered inactive. In leafroll disease of other plants, especially 

 60 in lilac, the abnormal starch accumulations also occur.— //. T. G&880W. 



2713. Newell, Wilmon. Citrus canker eradication in the State of Florida. California 

 Citrograph 4: 313, 323. 1919. — Paper read at Horticultural Convention at Riverside, Calif. 

 May, 1919. 



2714. NfowELL], W. [Rev. of: Ashbt, S. P. Bud-rot disease of coconuts. Jour. Jamaica 

 Agric. Soc. 22:331-333. 1918.] Agric. News [Barbados] 17:286-287. 191*. 



2715. Nowell, William. Root disease of coco-nut palms in Grenada. Agric. News 

 [Barbados] 17:398-399, 414-415. 1918.— Thought to be caused by nematodes.— D. Reddick. 



271G. Nowell, W. Investigation of the froghopper pest and disease of sugar-cane. Agric. 

 News [Barbados] 18: 174, 175, 190, 191, 206, 207, 222. 1919.— The author describes the con- 

 dition known as blight occurring in sugar-cane fields in Trinidad. Hitherto this condition 

 was supposed to have been brought about entirely by the attacks of the froghopper (Tomaspis 

 saccharina Distant). Recently, how r ever, C. B. Williams found from his studies of the 

 problem that this pest could not account for all the so-called blight. It now appears from 

 the author's co-operative work, along mycological lines, that the root disease, caused by 

 fungi of the Marasmius and Odontia groups, is an important factor in the Trinidad problem 

 and is causing a great deal of the damage which has been attributed to the froghopper. The 

 nature of root disease is described, and the factors influencing it, soil conditions, remedial 

 measures, sanitation, rotation, ratooning, manuring, etc., are fully discussed. — /. S. Dash. 



2717. Nowell, W. Mycologist's report on a visit to Trinidad. Proc. Agric. Soc. Trinidad 

 19: 141-159. 1919. — A discussion of the root diseases of sugar cane in connection with the 

 injury done to the plants by the froghopper. Remedial measures suggested are better culti- 

 vation, sanitation, rotation of crops, and the selection of good seed canes. — J. B. Rorer. 



2718. Padr6n, Andres. Tratamientos insecticidas y anticriptogamicos de las plantas 

 citricas. [Spraying citrus trees.] Revist. Agric. Com. y Trab. 2: 388-390. 2 fig. 1919. 



2719. Pammel, L. H. The extermination of the common barberry to prevent crop leakage 

 due to stem rust. Rept. Iowa State Hortic. Soc. 53: 401^08. 1918. — Gives a brief account 

 of barberry, its relation to stem rust of grass, Puccinia graminis, and the history of the move- 

 ment that led up to its extermination. A comparison of the common barberry (Berberis 

 vulgaris) and Japanese barberry (B. thunbergii). — L. H. Pammel. 



2720. Pammel, L. H. Recent literature on fungous diseases of plants. Rept. Iowa State 

 Hortic. Soc. 53: 185-225. 1919. 



2721. Parker, R. C. Testing seed potatoes on Long Island. Potato Mag. 2 s : 8, 22-23; 

 2*: 19, 27-28. / fig. 1919. — Considers mosaic, potash deficiency, and leaf roll. — Donald 

 Folsom. 



2722. Pater, B. Bericht iiber das Arzneipflanzenversuchsfeld der landwirtschaftlichen 

 Akademie in Koloszvar. [Report on the experimental field of medicinal plants of the agricul- 

 tural college in K.] Part 3. 53 p., 8 fig. Koloszv&r, 1918.— Henbane (Hyoscyamus) was 

 ruined by an attack of mildew (Erysiphe cichoriacearum) although wild plants were slightly 

 affected. Ascochyta hyoscyami caused brown leaf spots and stem lesions in 1916. — Notes on 

 insect enemies and cultural conditions. [From abstracts by Matouschek in Zeitschr. 

 Pflanzenkr. 29:106-107. 1919.]— D. Reddick. 



