552 EXPERIMENT STATION RECORD. 



Silver thread disease of coffee in Surinam, J. Kuijpee (Rec. Trav. Bot. 

 N^erland., 9 {1912), No. If, pp. J,36-.'f51, pi. 2).— The substances of this article 

 has already been given (E. S. R.. 29, p. 351). 



Study of a new species of Peronospora, F. Vincens (Bui. Trimest. Soc. 

 Mycol. France, 29 (1913), No. 1, pp. 174-180, pi 1). — Results are given of a study 

 of the fungus found on the upper leaf surface of Cephalaria leucontha in the 

 botanical garden at Toulouse. The parasite is said to be new and has been 

 named P. cephalarice n. sp. 



Further infection studies on Ustilago antherarum, E. Wekth (Mitt. E. 

 Biol. Anst. Land u. Forstw., 1912, No. 12, p. 18; al)s. in Mycol. CenthL, 1 (1912), 

 No. 11, p. 369). — Continuing previous work (E. S. R., 26, p. 552) with Melan- 

 drium alMm, the author claims that the presence of V. antherarum in the 

 flowers of male plants promotes the development of a pistil. This remains 

 rudimentary, it is true, but it exhibits a well differentiated ovarium. 



Black spot of roses, F. A. Wolf (Alahama Col. Sta. Bui. 112, pp. 113-118, 

 pis. 2, figs. 3). — The author presents in concise form the information at hand 

 relating to the black spot of roses due to Diplocarpon rosce, a previous descrip- 

 tion of which has been given (E. S. R., 28, p. 449). The different stages of the 

 fungus, which has been previously referred to as Actinonema rosce, are described 

 at length, and methods of control, which consist of proper sanitation, cultivation, 

 and spraying with fungicides, are given. While different fungicides are suc- 

 cessful in the control of this disease, the author recommends the use of am- 

 moniacal copper carbonate, as it is less liable to discolor the plants. 



Diseases of trees, K. Bakcroft (Agr. Bui. Fed. Malay States, 1 (1913), No. 6, 

 pp. 218-221). — The cost of treatment of pink disease (Corticium salmonicolor) 

 is reported to be $1.05 per acre. Brown rot disease (EymenoclicBte noxia) is 

 supposed, from specimens sent for examination, to exist in Uganda, Africa, and 

 to be more abundant in Ceylon than Fames seynitostus. The latter is thought 

 to be spread by the heavy wash due to rains, etc. Phyllosticta ramicola is 

 reported to be still spreading over the Federated Malay States, being closely 

 followed by a Diplodia, causing die-back. The fungus observed on roots and 

 stumps of Angsana trees has been identified as Polystictiis hirs'utus and not 

 P. occidentalis, as at first thought, and is probably not parasitic. 



Notes on tree pathology, L. Savastano (Ann. R. Staz. Sper. Agrum. e Frut- 

 ticol. Acireale, 1 (1912), pp. lll-lJ^O, pis. 8). — This article discusses certain 

 common diseases of trees and their treatment, including kinds of instruments 

 and their use, and includes brief reports on methods and results of treatments 

 in cases described, with some of the conclusions drawn. 



Chestnut bark disease, G. P. Clinton (Connecticut State Sta. Rpt. 1912, 

 pt. 5, pp. 359-453. pis. 8). — A detailed account is given of investigations carried 

 on by the author on the identity of the fungus causing the chestnut bark disease, 

 as well as its life history, present distribution, etc. A preliminary report on 

 the identity of the fungus has been given elsewhere (E. S. R., 28, p. 651). 



Tlie fungus is reported as occurring in 12 States, from New Hampshire and 

 Vermont on the north to Virginia and West Virginia on the south. It consists 

 of a conidial or Cytospora stage and also a mature or ascospore stage. In 

 addition to occurring on the chestnut it has rarely been found on oaks, where 

 as yet it has caused no serious damage. Artificial inoculation of chestnut 

 sprouts or seedlings resulted in characteristic cankers in the bark, and these 

 can be produced to some extent on oak sprouts. 



The parasitic form of the fungus which results in the disease, according to 

 the author, is so nearly like the species Endothia gyrosa that he has considered 

 it as a variety, to which the name E. gyrosa parasitica is given. 



