848 EXPEEIMEXT STATIOX EECOED. 



pis. 12; abs. in Agr. News [Barbados], 14 (1915), No. 354, P- S82).— This contri- 

 bution, which is given in Dutch, English (translation by A. M. W. Ter Laag), 

 and German, is said to be the outcome of an investigation suggested by the 

 publication of studies by Rorer (E. S. R., 29, p. 851) on the witches' broom 

 disease of cacao in Surinam. 



The organism, which is found in diseased shoots, indurated pods, and in- 

 fected flower cushions of the cacao tree, is described as M. peniiciosus n. sp. 

 Mycelium isolated from diseased plants and used for inoculation gave no 

 results, but spore material reproduced the disease. 



While heavy shade appears to favor the fungus by the retention of moisture, 

 it is thought best to decrease the shade gradually rather than suddenly. 

 Drainage has the effect of strengthening the plants against attack. The 

 diseased parts should be destroyed, and Bordeaux mixture should be applied 

 to the trees in the form of a line si>ray. 



Coffee leaf disease (Hemileia vastatrix) in Uganda, S. Simpson and W. 

 Small (Proc. Intcrnat. Cong. Trop. Agr., 3 (1914), pp. 365, 366).— In an abstract 

 here given of this paper, it is said to have been establishetl that no record 

 exists of coffee trees having been attacked locally by any species of Hemileia 

 other than //. vastatrix, and that so far spores of this fungus from Coffea 

 robusta have failed to infect leaves of cultivated coffee. 



The drier weather of 1913 arrested the disease. Bordeaux and Burgundy 

 mixtures have continued to give good results, but other applications have been 

 disappointing. 



No aecidial stage of H. vastatrix has yet been found. At least 10 genera 

 of the Rubiaceje occur in the Victoria Nyanza region, and 4 of these are known 

 to harbor species of Hemileia in other localities. 



Citrus canker, A. J. Cook (J/o. Bui. Com. Hort. Cat., 3 (19U), No. 12, pp. 520, 

 521). — This is partly a brief notice of information, furnished mainly by Berger 

 (E. S. R., 34, p. G49) and by Stevens (E. S. R., 31. p. 54), regarding the 

 origin, distribution, .symptoms, and res-ults of citrus canker, and partly a 

 discussion of protective measures, including quarantines by States. 



Citrus canker in America. The outbreak of a new disease, (i. P. Dabnell- 

 Smith (Agr. Gaz. N. S. Walci^. 20 (1915), No. 6, pp. 517, 518).— The author dis- 

 cusses an extract from a bulletin on citrus canker by Stevens (E. S. R., 31, 

 p. 54) and one from the above article by Cook. 



The discovery of the chestnut blight parasite (Endothia parasitica) and 

 other chestnut fungi in Japan, C. L. Shear and N. E. Stevens (iScietice, n. ser., 

 43 (1916), No. 1101, pp. 173-176).— The presence of E. parasitica on chestnut 

 trees in the vicinity of Nikko, Japan, was definitely established from material 

 received from several sources. In addition to K. parasitica, E. radicalis has 

 been found on the bark of Pasani-a sp., a genuS closely related to Quercus. 

 This seems to establish the fact that E. radicalis is indigenous to Japan and 

 is not confined to the genus Castanea. 



The chestnut bark disease in Vermont, R. M. Ross (Vt. Forestry Pub. 16 

 (1915), pp. 16, pis. 4). — It is stated that the chestnut blight, ascribed to En-dothia 

 gyrosn parasitica, and said to be found in all the New England States, 

 threatens to infect all the chestnut areas in Vermont. No methods have been 

 found effective in checking the disease or in saving a tree when once badly 

 diseased. 



While wood once infected begins to deteriorate within two years after the 

 death of the tree, timber cut before infection may be seasoned and kept for 

 many years. Suggestions for the utilization of chestnut wood are given. Com- 

 plete destruction of all infected material is insistetl upon. 



