150 EXPERIMENT STATION RECOED. [Vol. 88 



been proved to be identical witli tlie inlieritable form found elsewhere. No 

 powdery scab or wart disease has been reported from Bermuda, the inspection 

 system appearing to be entirely adequate. 



A new disease of sugar cane, J. A. Stevenson (Porto Rico Dept. Agr. Sta. 

 Circ. 11 (1911), Spanish Ed., pp. 12; noted in La. Planter, 59 (1911), No. 5, pp. 

 16~1S; Agr. News [Barbados], IG (1911), No. 401, p. 286).— An account is 

 given of a disease recently observed in Porto Rico, which is characterized by a 

 peculiar mottling of the leaves. The leaves, however, differ distinctly from 

 those affected with chlorosis in that they are marked with numerous white or 

 yellow spots and stripes with irregular margins. Affected stools are said to be 

 dwarfed, and in advanced stages of the disease the ratoons are very much 

 stunted. The disease is capable of being transmitted through the planting of 

 affected canes, and varieties seem to differ with regard to the extent to which 

 they are susceptible to attack. No definite cause is as yet known, but the author 

 suggests some similarity between this disease and the sereh disease of the East 

 Indies. 



Control measures recommended include increased fertilization, liming, thor- 

 ough preparation of the soil, selection of disease-free seed, use of new land, and 

 rotation of crops. 



Bacterial leaf spot of tobacco, F. A. Wolf and A. C. Foster (Science, n. ser., 

 46 (1911), No. 1189, pp. S61, S62). — Leaf spot of tobacco is said to have been 

 found in certain sections of North Carolina, where the disease, because of the 

 rapidity with which it spreads, has been given the popular name " wild fire." 

 The disease is said to manifest itself first in destructive form at the time of 

 transplanting, and from observations it is believed that the trouble is intro- 

 duced from the seed beds. 



Leaf spot, it is stated, first appears as circular yellow spots about 1 cm. in 

 diameter, with a minute brown area in the center of the spots. Within a few 

 days the brown areas become enlarged to 2 or 3 cm. in diameter, and where the 

 spots are numerous they fuse, giving large, brown, irregular areas which in 

 severe cases involve most of the leaf tissue. 



The authors have isolated a grayish-white bacterial organism, and inocula- 

 tion experiments have proved that it is the cause of the disease. The organism 

 appears to be undescribed, and the name Bacterium tahacum n. sp. is given it. 



A detailed account of culture studies and inoculation experiments is reserved 

 for a subsequent publication. 



On a case of recovery from mosaic disease of tomato, W. B. Brierley 

 (Ann. Appl. Biol., 2 (1916), No. 4, pp. 263-266) .—In view of the alleged demon- 

 stration of the presence of mosaic virus in plants showing no external symptoms 

 of the disease, the author has experimented with shoots apparently healthy, 

 though springing from a diseased stock. Inoculation proved that the original 

 plants suffered from an attack of this disease, also that the sap of the shoots 

 apparently free does not produce infection. There remains the important ques- 

 tion as to whether the new shoots growing out of the calicoed stock acquired 

 immunity from the disease. 



The leaf spot disease of tomato, G. H. Ooons and E. Levin (Michigan Sta. 

 Spec. Bui. SI (1911), pp. 15, figs. 1). — Leaf spot of tomatoes due to Septoria 

 lycopersici is described and directions given for spraying with Bordeaux mixture 

 for its control. 



Tomato diseases, H. W. Baeke and J. L. Seal (South Carolina Sta. Circ. 29 

 (1911), no. 2). — The wilts, leaf diseases, root knot, and fruit rots to which the 

 tomato is subject are described and control measures, so far as any are knovi'n, 

 are given. 



