No. 1, August, 1920] PATHOLOGY 



729. Barrb, H. W. Report of the division of botany. South Carolina Wi.-. 3ta. 

 Ann. Rent. 32: 20-31. 1919. — A summary of the work on tin- following projects is given: 



Cotton anthracnose, angular loaf spot of cotton, bacterial content of milk, planl 'li i 

 survey, cooperative research. — G. H. Coon*. 



730. Blin, H. La pourriture des griffes d'asperges. [Asparagus root-rot.] Rev. Hortic. 

 91: 325-326. 1 fig. Aug., 1919. — This disease is due to Rhizoctonia violacea which atti 

 many other types of plants. All portions of asparagus plants which are attacked should be 

 carefully dug up and burned. The soil should then be disinfected with carbon-bisulfide 



(about 250 grams per square meter) or preferably formaldehyde (about 60 grams per squ 

 meter). Either of these should be forced into the soil at several places with a syringe. Sulfo- 

 carbonate of potassium (300 grams in 100 liters of water) has also been used successfully. 

 The soil is first removed from the hills which have been attacked and these are then Bprayed 

 lightly with the mixture. The following year, before hilling-up a second treatment is given. 

 Before replanting infected areas they should be thoroughly disinfected during the winter 

 and the clumps dipped in the disinfecting solution. Following any of these treatments the 

 soil should be well fertilized, since the disinfection destroys the soil organisms present. Care 

 should be taken to avoid such disinfectants as may leave harmful residues in the soil treated. 

 As a matter of precaution, it is better not to replant infected areas for 2 or 3 years. — E. ./. 

 Kraus. 



731. Boas, Friediucti. Beitrage zur Kenntnis des Kartoffelabbaues. [Contribution to 

 the knowledge of deterioration in potatoes.] Zeitschr. Fflanzenkrankh. 29: 171-176. 1919. — 

 The author states that minute differences in the hydrogen-ion concentrations may have marked 

 effects upon metabolic processes. — This caused him to inquire whether, in plant diseases, 

 especially in leaf roll or curly disease of potatoes, there could be determined any differences 

 in the hydrogen-ion concentrations existing in sound and diseased plants. — He ascertained 

 from his experiments (describing technique employed) that, without exception, the cell sap 

 of sound plants showed appreciably more acidity than that of diseased plants. The acid 

 metabolism of diseased plants is plainly disturbed. In determining the albumen metabolism 

 that might be expected under the circumstances, author determines that the diseased potato 

 stems are flooded with amino acids, while the sound tissues are free, or only show traces of 

 these acids. Examining then into the catalase contents of diseased and sound plants, he 

 finds obvious differences in his experimental varieties, inasmuch as the diseased portions show 

 an increase in catalase contents over the sound ones; but not all experiments gave identical 

 results. (Bibliography.) — H. T. Giissow. 



732. Chou, Chung Ling. Notes on fungous diseases in China. (Text in Chinese.) 

 Khu Shou [Science-Publication of The Chinese Science Society] 4: 1223-1229. J,6 fig. 1919. 

 — The author gives a detailed description of symptoms and morphology of fifteen fungous 

 diseases found in the locality of Nanking: Peronospora parasitica on Brassica juncca, Perono- 

 spora effusa on spinach, P. vicae on peas, P. schleidcniana on onion leaves, Altcrnaria brassicae 

 on Brassica pekinensis, Cercospora crucnta on beans, Ustilago crameri on wheat, U. avenae 

 on oats, Urycyslis tritici on wheat, Ustilago shiriana on bamboo, Erysiphe gramijiis on barley, 

 Pleospora gramineum on barley, Exoascus deformans on peach leaves, Aecidium mori on mul- 

 berry stems, and Sclerotinia cinerea on cherries. — Chunjen C. Chen. 



733. Cook, Mel. T. Philippine plant diseases. [Rev. of : Reinkixg, Otto A. Philippine 

 economic-plant diseases. Philippine Jour. Sci. A, 13: 165-274. 43 fig., 22 pi, 1918. (See Bot. 

 Absts. 2, Entry 1308.)] Bot. Gaz. 68: 310-311. 1919. 



734. Cook, Melville T. Report of the department of plant pathology. Ann. Rept. 

 New Jersey Agric. Exp. Sta. 1918: 299-302. 1919. 



735. Cook, Mel. T. Potato diseases in New Jersey. New Jersey Agric. Exp. Sta. Circ. 

 105. 38 p. 1919. — Along with descriptions and illustrations of the common potato diseases 



