Department of Plant Pathology Ixxxiii 



fire blight, with special reference to its occurrence in nursery stock, have 

 occupied most of the time. The outcome of investigations and of the 

 experiments in control is now being prepared for publication. 



Experimental work in the control of various foliage diseases has been 

 continued and satisfactory progress made. 



Ginseng diseases. — This work has gone forward in cooperation with 

 the State Ginseng Growers' Association and with the Department of 

 Cotton and Truck Disease and Sugar-Plant Investigations, Bureau of 

 Plant Industry, United States Department of Agriculture. Bulletin 250 

 of the Bureau of Plant Industry, entitled " Diseases of Ginseng," has 

 been published. The special lines of work receiving particular attention 

 are the alternaria blight, the study of which is nearing completion, the 

 wilt, various root rots, rust, and mildew. A technical article, " Infection 

 Experiments with Tliielatia basicola in Ginseng," has been prepared by 

 Mr. Rosertbaum, special assistant in these investigations, and is now in 

 press (Phytopathology 2:191-196. ph. 18 and 19. 1912). Other shorter 

 articles dealing with various phases of the investigations have been pub- 

 lished in various trade papers. 



The use of sidfur and its compounds as a fungicide. — Investigation of 

 the fungous flora of the soil, conducted by C. N. Jensen, has been 

 brought to a close and the results have -been published in Experiment 

 Station Bulletin 315. The experiments on the use of sulfur as a 

 fungicide for potato scab, begun by Mr. Jensen, have been continued by 

 C. D. Sherbakoff. Another year of experimentation is required before 

 satisfactory data from which to draw conclusions can be obtained. Mr. 

 Sherbakoff is making an investigation of the fungous flora of the potato. 



The work in control of hop mildew, which gave such satisfactory 

 results last year, has been continued with gratifying results. Associations 

 at Waterville and Milford, representing nearly one thousand acres of hop 

 yards, have aided in this work. The use of various grades of sulfur has 

 received special attention. The use of dust sprays on the foliage and 

 fruit of apples, peaches, and plums has been continued, but, unfortunately 

 for the investigation, there has been a dearth of diseases of these fruits 

 again this year. At least one important point in connection with the 

 application of a dry spray seems to have been established, namely, that a 

 dry poison applied in dust form is thoroughly effective .against the more 

 common chewing insects attacking the apple. Professor Crosby of the 

 Department of Entomology has assisted in taking notes on this point. 

 Some of the dry sulfur mixtures have shown fungicidal value against 

 the apple-scab fungus in a season of mild attack. 



I. C. Jagger has continued investigations of truck-crop diseases, on 

 the Herman Frasch Fellowship established by the Union Sulphur Com- 



