DISEASES OF PLANTS. 657 



Experiments with corn smut (p. 352). — Negative results similar to the 

 above were obtained from experiments on the prevention of smut carried 

 on in the greenhouse. 



Fungicides and spraying (pp. 352-378). — Formulas for the fungicides 

 used in the above experiments, details of application, and notes on their 

 behavior toward the different plants are given. The principal fungi- 

 cides employed were Bordeaux mixture and 3 modified solutions in 

 which the lime of the Bordeaux mixture was replaced by soda, potash, 

 and ammonia. The experiments above mentioned with lime, corrosive 

 sublimate, kainit, copper sulphate, sulphur, etc., are reviewed. 



Experiments with ornamental and other plants (pp. 396-400, 405-413). — 

 Experiments are briefly reported on attempts to combat blight of peo- 

 nies, leaf spot (Gercospora cercidicola) of Japanese redbud, leaf blight 

 of hollyhock due to Cercospora althceina, diseases of gladiolus, preven- 

 tion of rust of china asters caused by attacks of Coleosporium sonchi- 

 arvensis (?), and experiments with sweet peas and stem blight (Phlyc- 

 tcena sp.) of cosmos. Experiments reported with water lily blight 

 indicate that Bordeaux mixture will prevent the disease, although the 

 incrustation on the leaves is objected to. 



The rust of asparagus is reported upon at considerable length. The 

 fungus Puccinia asparagi seems to be spread along the Atlantic coast 

 from Virginia northward. All varieties seem equally susceptible except 

 the Palmetto. This seems thus far to be partially resistant. Burning 

 the dead tops in the fall is recommended. 



Notes are given on a nasturtium blight, an ampelopsis blight, an 

 anthracnose of magnolia, a blight of chestnut, and a blight of linden. 



Experiments with peach root galls (pp. 413, 414). — The application of 

 sulphur about the roots of the seedlings seemed to indicate that it could 

 be relied upon for the prevention of the root galls. There appears to 

 be no connection between the cause of the galls on the peach roots and 

 those on raspberry roots. 



Si/tings from other sources (pp. 415-429). — Under this heading are 

 given abstracts of various pnblications of the stations and of this 

 Department. 



Bacteriosis of carnations, A. F. Woods (Bot. Gaz., 24 {1897), JSfo. 3, 

 pp. 200-205). — The author has investigated the d:seases of carnations 

 described by Arthur and Bolley ' as bacteriosis of carnations. He con- 

 cludes that the disease is not due to bacteria, as has been supposed, 

 but to the punctures of aphides and thrips. The cells affected become 

 cedemic, collapse, and give a whitish sunken area. In the early stages 

 no bacteria or fungi are associated with the disease, though the dead 

 tissue may be infected later. Proper selection and propagation of stock 

 and keeping down as far as possible the aphides and thrips are recom- 

 mended as measures for preventing the disease. 



1 Indiana Sta. Bui. 59 ( E. S. K., 8, p. 235). 



