664 EXPERIMENT STATION BECORD. 



The cause of gTimmosis of tobacco and experiments on its control, J. A. 

 Honing {Meded. Deli^Pioefstat. Medan, 5 (1911), No. 6, pp. 169-1 S5).— This is 

 a further study of this disease along lines similar to those followed in the first 

 report (E. S. R., 24, p. 248), and includes infection experiments, a method of 

 detecting the slime bacteria in the soil, and tests with chlorid of lime and 

 potassium permanganate for controlling the disease. 



A new fungus on dying apple trees, R. Laubert {Gartenflora, 60 {1911), 

 No. Jf, pp. 76-78, fig. 1). — The author describes as a new genus and species 

 PscudodiscuJa endogenospora, a semiparasitic fungus found on the bark of 

 dying and dead young apple trees. 



A new fungus on dying apple trees, R. Laubert (Oartenflora, 60 {1911), 

 No. 6, pp. 133, IS-i). — A taxonomic discussion of the fungus noted above, in 

 which the author decides that the fungus should be called Sclerophoma en- 

 dogenospora. 



Further researches on the development of roncet of the grape, E. Panta- 

 NELLi {Atti R. Accad. Lincei, Rend. CI. Fis., Mat. e Nat., 5. ser., 20 {1911), 

 I, No. 8, pp. 575-583). — A general summary is given of the conditions of cul- 

 ture, soil, etc., which are associated with this disease of the grape, and the 

 resistance of certain varieties of grapes to its attack is discussed. 



The Sclerotinia (Botrytis) disease of the gooseberry, or die-back {Bd. 

 Agr. and Fisheries [Londmi^, Leaflet 2-^8, pp. 1-7, figs. 5). — The symptoms of 

 this disease and remedies for its control are given. It may attack the main 

 stem and base of the branches, the young wood of the current year's growth, 

 the leaves, and the berries. 



The best method of controlling the disease is the prompt removal and burn- 

 ing of all dead bushes and branches. Heavy spraying with copper sulphate 

 solution (4: 100) just before the buds burst will kill the tufts of conidia which 

 appear on the infected stems and branches, thus checking to some extent the 

 spread of the disease, while spraying the foliage with Bordeaux mixture 

 (8:8:100) will often prevent serious leaf infection. 



A stem canker of Robusta and Quillou coffee, F. C. voN Fabeb {Teysman- 

 nia, 21 {1910), No. 9, pp. 5.'f8-555). — A description is given of a new coffee 

 disease which causes the leaves to become yellow and hang down against the 

 stem, while dark-brown to black cankerous areas appear on the bark. 



By microscopical examinations and culture tests the cause of the disease 

 was found to be a fungus, for which the name Ascospora coffece n. sp. is pro- 

 posed. Infection experiments showed that the fungus does not attack sound, 

 healthy trees, but enters through wounds in the bark. 



The remedies suggested are the digging up and burning of the diseased plants. 



Arrowroot diseases {Agr. News [Barbados], 10 {1911). No. 237, pp. 17 Jf, 

 175).— In an extract from a report of F. W. South on a "burning" of arrow- 

 root in St. Vincent the characteristics of this disease and remedial measures 

 are discussed. 



The disease has been known on the island for a number of years and is widely 

 distributed, appearing at places here and there in the fields, but spreading very 

 slowly. The diseased plants have fewer lenves than healthy ones, and these 

 are often rolled up and somewhat wilted, while the scale leaves of the rhizome 

 are blackened throughout. The disease penetrates to the rhizome, forming 

 small black spots, which increase in size until most of the surface becomes black. 

 Dark-brown streaks J mm. in size run inward from the surface in a radial 

 direction. A brown mycelium was found in narrow strands along the surfaces 

 of the scale leaves, from which, under damp conditions, a white mycelium may 

 often develop between the surfaces of the creeping stems and the inner surfaces 

 of the scale leare*. 



