382 PATHOLOGY [Bot. Absts. 



2620. Doidge, E. M. Common fungous and bacterial diseases of plants. Union of South 

 Africa, Dept. Agric. Bull. (Local Ser.) 78. 1919.— An illustrated chart of plant diseases with 

 remedial measures for the use of farmers and fruit growers.— E. M. Doidge. 



2621. Doidge, E. M. Walnut bacteriosis, Bacterium juglandis Pierce. South African 

 Jour. Sci. 15: 407-412. 1919.— Walnut bacteriosis occurs in a number of localities in South 

 Africa, and often causes serious damage, especially in wet seasons and in places where rain 

 falls in the spring and early summer. In the Oudtshoorn district, which has a winter rain- 

 fall of about 10 inches and little or no summer rain, no bacteriosis has been observed. The 

 organism has been isolated, studied in pure culture and the disease reproduced by inocu- 

 lation. — E. M. Doidge. 



2622. Doidge, Ethel M. The bacterial blight of beans. South African Jour. Sci. 15: 

 503-505. 1919.— The bacterial blight of beans (Phaseolus vulgaris and P. lunatus) is common 

 in South Africa. The organism is disseminated with contaminated seed both from local 

 sources and imported from overseas. It has been isolated, and studied in pure culture, and 

 the disease reproduced by inoculation; the organism is Bacterium phaseoli, originally de- 

 scribed as causing bacteriosis in beans in America.— E. M. Doidge. 



2623. Doidge, Ethel M. Diseases of stone fruit trees, I. Peach leaf curl. Taphrina 

 deformans (Fckl.) Tul. South African Fruit Grower 6: 211. 1919. 



2624. Doidge, Ethel M. Walnut blight. Union of South Africa, Dept. Agric. Bull. 

 1918 14 . 4 p. 2 fig. 1918. — Disease (caused by Bacterium juglandis) is prevalent in all 

 parts of country where conditions are favorable. "The blight only spreads rapidly where 

 there is a good deal of rain and mist during the spring and summer while the nuts are form- 

 ing." — D. Reddick. 



2625. Dtjysen, F. Holzwucherungen. [Intumescences in wood.] Sitzungsber. Ges. 

 Naturforsch. Freunde Berlin 1918:67-82. 14 fig. 1918. 



2626. Easlea, Walter. Mildew resistant roses: with some suggestions as to increasing 

 their number. Jour. Roy. Hortic. Soc. 43: 253-260. 1919.— See Bot. Absts. 3, Entries 2119 

 and 2256. 



2627. Ensign, M. R. Sweet potato mosaic. Phytopath. 9: 181. 1919.— The leaves are 

 dwarfed, malformed, and mottled. Yields showed a difference of 300 per cent. There is no 

 evidence that the disease is directly communicable to adjacent plants. — R. E. Vaughn. 



2628. Eriksson, Jacob. Zwei russische Gymnosporangieen. [Two Russian gymno- 

 sporangia.] Ark. Bot. [Stockholm] 15: 1-23. S pi. 1919. 



2629. Esam, Gordon. Orchard sprays and spraying. Jour. Agric. [Xew Zealand] 17: 

 103-109. 1918. 



2630. Esmarch, F. Zur Kenntniss des Stoffwechsels in blattrollkranken Kartoffeln. 

 [Metabolism in potato leaf roll.] Zeitschr. Pflanzenkr. 29: 1-20. 1919. — Author inclines to 

 agree with Quanjer who, from his anatomical studies of leafroll, suggests that there occurs an 

 extensive check in the translocation of the assimilates of the leaves. This factor is un- 

 doubtedly to be regarded as a symptom of "potato leafroll." He continues that, in conse- 

 quence of this check, there results an increase of the starch contents in the leaves of leafroll 

 plants. The chloroplasts can only store a limited amount of starch, hence, once this limit 

 is reached, there must result a check to the assimilation, inasmuch as less soluble carbo- 

 hydrates are produced. As a consequence less reserve materials reach the vegetative centers, 

 and the characteristic dwarfed habit of the plants, as well as their reduced yield in tubers, 

 becomes manifest. Author prefers not to draw any further conclusions relative to the eti- 

 ology of the leafroll disease. The check in translocation of starch is an important, though 



