1086 EXPERIMENT STATION RECORD. 



bark was dead and of a reddish color. The trees in general appeared unhealthy and 

 many were dead. 



Subsequently studies were made of the fungus, and comparisons are drawn between 

 this and allied species. The development and life history of the parasite are 

 described, after which notes are given on inoculation experiments carried on in the 

 forest, the* amount of injury caused, etc. 



Root rot of logwood trees {Agr. Xeics [Barbados], 4 {1905}, No. 96, p. 389).— This 

 disease, which was previously described (E. S. R., 14, p. 882), causes the destruction 

 of trees in considerable number through the presence of a mycelium invading the 

 roots and spreading upward into the trunk, between the bark and the wood. 

 Although the fruiting organs of the fungus have not been discovered, it is believed to 

 be a hymenomycete. 



The disease is found in trees growing in different kinds of soils and under varying 

 climatic conditions, and has been recently reported as spreading rapidly in Jamaica. 

 It is contagious, spreading through the soil, and to prevent its further spread it is 

 recommended that trenches 3 ft. deep be dug about the diseased area, when confined 

 to definite patches. Where it is widely disseminated the clearing of the infested 

 tract and cultivation with other crops are recommended. 



Some Indian forest fungi, E. J. Butler (Indian Forester, 31 (1905), Xo. 10, pp. 

 548-556, figs. 3).— After discussing fungus diseases in general, the author describes the 

 attacks of Chrysomyxa himalense on rhododendrons and different forms of Gymnospo- 

 rangium cunninghamianum, the aecidial form of which occurs on Pyrus pashia and 

 the teleuto form on cypress. 



Some rose diseases, E. Foex (Prog. Agr. et Vit. (Ed. VEst), 26 (1905), Xo. 48, 

 2)p. 616-619, pi. 1).— The author describes the rose rust, due to Phragmidium subcorti- 

 cium, the rose mildew (Sphserotheca pannosa), and the attacks of Marsorda rosse, which 

 causes the premature falling of the leaves. 



For the control of the mildew the author recommends spraying with a mixture of 

 carbonate of soda 1.5 kg., Norwegian tar 0.5 kg., and water 100 kg. 



North American salvia rusts, E. W. D. Holway (Jour. Mycol, 11 (1905), Xo. 

 78, pp. 156-158). —Technical descriptions are given of a number of species of rusts that 

 are known to attack various species of salvia, and Puccinia infrequens, P. badia, and 

 P. nivea are described as new species. 



A new orchid disease, G. Massee (Gard. Chron., 3. ser., 38 (1905), Xo. 973, pp. 

 153, 154, fig- !)■ — A description is given of a recently recognized disease of Oncidium, 

 which is attributed to Hemileia americana n. sp. 



This fungus, which is closely allied to that causing the most destructive coffee dis- 

 ease, threatens to become a serious pest in orchid culture if it once becomes estab- 

 lished. The fungus forms bright orange, powdery-looking patches of various sizes 

 on the under surface of the leaf, with corresponding areas of a sickly yellowish-green 

 color on the upper surface. On account of the threatened seriousness of this disease, 

 the prompt destruction of every leaf showing the symptoms above indicated is 

 recommended. 



An orchid disease, H. Klitzing (Gard. Chron., 3. ser., 38 (1905), Xo. 980, p. 

 259). — A description is given of Glceosporium beyrodbii, a new species which appears 

 in dense masses on both sides of the leaves of Vanda cccridea. The spots sometimes 

 run together, forming dark blotches, and finally bring about the destruction of the 

 entire plant. The fungus is briefly characterized. 



The action of copper salts on plants, F. Porchet and E. Chuard (Bui. Murith. 

 Soc. Valais. Sci. Nat, 1904, Xo. 33, pp f 204-210, pi. 1).— This bulletin, which was 

 issued in 1905, gives an account of experiments which have been carried on at the 

 Viticultural Station of Lausanne since 1886 to test the effect of copper compounds 

 on plants, especially the practical effect in reducing disease, and the effect of fungi- 

 cides on wines made from sprayed grapes. 



