280 PATHOLOGY [Bot. Absts., Vol. VI. 



PATHOLOGY 



G. H. Coons, Editor 

 C. W. Bennett, Assistant Editor 



1932. Anonymous. Beschadigungen an Eichen durch Diaporta taleola Tul. [Injury to 

 oak by Diaporta taleola Tul.] Schweiz. Zeitschr. Fortsw. 69: 62-63. Frontispiece. 191S. — 

 The disease described by Moreillon in Forestier Suisse, according to Dr. Schellenberg, 

 is caused by Diaporthe (Aglaospora) taleola. A description and illustration of the affected 

 tree and a short description of the organism. — D. Reddick. 



1933. Anonymous. The ring or Bangadi disease of potato. Leaflet Dept. Agric. Bombay 

 1918: 3. 1918.— This ring disease, known to the people as bangadi or chari, is characterized 

 at first by partial and later by complete withering of the potato plants, which then turn 

 brown and dry up. Cross sections of tubers from diseased plants show a brown ring from 

 which a cream-yellow bacterial slime oozes under slight pressure. Both field and storage 

 rots result. It appears to be spread in the field by irrigation water. The disease originates 

 in infected seed and is therefore to be avoided by the use of healthy seed, proper disinfection 

 of the cutting knife after a diseased tuber is cut, and by good field sanitation and drainage 

 since the trouble develops most seriously in water-logged areas. The name of the causal 

 organism is not given. — H. A. Edson. 



1934. Anonymous. Bestrijding van schurftziekte bij appelen en peren. [Control of scab 

 on apples and pears.] Tijdschr. Plantenz. 26: 108. 1920. Newsletter No. 13 of the Phyto- 

 pathological Service, March, 1920. — Outlining spraying program, and methods of making 

 spray mixtures. — H. H. Whetzel. 



1935. Bessey, E. A. The effect of parasitism upon the parasite — A study in phylogeny. 

 Michigan Acad. Sci. Ann. Rept. 21 : 317-320. 1919. — In a brief account, the writer considers 

 various steps involved in change from the holophytic to parasitic habit in plants of various 

 orders of evolutionary complexity. Epiphytism is considered the first step toward parasi- 

 tism. "The next step seems to have been partial or total endophytism." This type of rela- 

 tionship shows various degrees from the simple shelter and partial feeding in Chlorochy'trium, 

 to the endophytism shown in certain red seaweeds which, while still possessing chloroplasts, 

 adopt a filamentous form of structure. Among the higher plants the mistletoes (Viscum or 

 Phoradendron) are comparable to this type of relationship. Following endophytism true 

 parasitism is found either intra- or intercellular in the host relationship. In the case of 

 complete parasitism, a considerable reduction of the plant body and an increase in size of re- 

 productive structures take place, but among the yeasts and some other forms a reduction of 

 the reproductive structures occurs. Clearly the simpler the structure to begin with, the 

 slighter the change beyond loss of chlorophyll and chloroplasts. With the plants of more 

 complicated vegetative structure two tendencies appear — a simplification and reduction of 

 all organs for photosynthesis, and an emphasizing of the reproductive portions. When, 

 however, the former tendency is carried too far, as in the yeasts, the reproductive portion 

 has to be reduced as well. — G. H. Coons. 



1936. Bintner, J. Silver leaf disease. Stereum purpureum. Kew Bull. Misc. Inf. 

 [London] 1919: 241-263. PI. 8, fig. 1-8. 1919.— This disease is known to attack the following 

 plants: — Prunus spp., Malus sylvestris, Exochorda sp., Neviusia alabamensis, Philadelphus 

 sp., Spiraea japonica glabrata, Ribes cereum, Ribesspp. (currants and gooseberries), Laburnum 

 alpinum and vulgar a, Syringa sp., Aesculus carnea and hippocastanum, Pernettya mucronata. 

 The hyphae of this pathogene are always found in the stem and roots of silver-leaf trees, though 

 they have never been found in either the petiole nor the leaf blades of such trees. True 

 silver leaf caused by this pathogene is distinguished from false silver leaf not caused by any 

 organism. Infection occurs through wounds on stems or roots. A bibliography and his- 

 torical account of the disease are given. — E. Mead Wilcox. 



