50 EXPERIMENT STATION RECORD. [Vol.38 



lina Experiment Station and this Department for the control of the tobacco 

 wilt due to Bacterium solanacearum. This disease Is widely distributed, having 

 been first reported in North Carolina in 1903 and being known to occur in 

 Sumatra, Java, and Japan. 



Experiments have been carried on to determine whether the wilt can be 

 controlled by a chemical or physical treatment of the soil, but without any 

 encouraging results. Crop rotation has given satisfactory results, and it is 

 recommended that this be practiced, infested land being planted to other crops 

 for at least five years. In order to prevent the introduction of the wilt on 

 farms not already infested, the authors recommend that seed beds be thoroughly 

 sterilized by burning and that care be taken not to allow surface drainage from 

 infested farms to reach seed beds or other tobacco lands. 



Winter blight of the tomato, C. R. Orton and W. H. McKinney, jb. {Penn- 

 sylvania Sta. Rpt. 1915, pp. 2S5-246, pis. 6). — According to the authors, winter 

 blight of tomatoes has caused considerable damage in certain sections of 

 Pennsylvania where this crop is grown commercially under glass. The symp- 

 toms of the disease are described, the stems, leaves, flowers, and fruits being 

 affected. It is said to spread quite rapidly through the greenhouse and seems 

 to be carried by soil and insects and to be disseminated by contact. 



Several theories have been advanced as to the cause of the disease, bacteria, 

 species of fungi, and nonparasitic causes due to unfavorable soil conditions 

 having been considered. Some work is being done on all these theories, and 

 a light yellow and an orange-brown organism has been isolated quite con- 

 stantly from diseased plants, but all attempts to reproduce the disease by 

 inoculating plants with cultures of these organisms have been unsuccessful. 



While the cause of the trouble is not definitely known, some experiments in 

 control have been carried on in which resistant strains were tested and attempts 

 made to prevent the disease by combating the white fly and by spraying with 

 Bordeaux mixture and other fungicides. Promising results were obtained in 

 the test of resistant strains and the white fly control experiments, but spraying 

 with fungicides is said to have given negative results. Suggestions for the 

 prevention of the disease include the selection of healthy plants; sterilization 

 of seed ; frequent renewal of seed beds ; proper attention to ventilation, water- 

 ing, etc. ; and control of the white fly. 



Common diseases of apples, pears, and quinces, M. T. Cook {New Jersey 

 Stas. Circ. 80 {1911), pp. 27, figs. 23). — This is a revision of Circular 44, pre- 

 viously noted (E. S. R., 33, p. 349). 



Common diseases of the peach, plum, and cherry, M. T. Cook {New Jersey 

 Stas. Circ. 81 {1911), pp. 3-19, figs. 11). — This is a revised edition of Circular 45, 

 previously noted (E. S. R., 33, p. 349). 



Diseases of stone fruits, J. Chifflot {Pomol. Franc., No. 1 {1911), pp. 21- 

 32). — It is stated that among numerous fungus attacks of stone fruits in the 

 region of the Rhone Valley very serious damage is done by Exoascus deformans, 

 Coryneum beyerinckU, ManiUa cinerea, and M. laxa, particularly the last two 

 named. 



Note on Br. J. Smolak's paper, A Contribution to our Knowledge of Silver- 

 leaf Disease, F. T. Brooks {Ann. Appl. Biol., 2 {1916), No. 4, pp. 228, 229).— 

 Referring to a discussion of his previous communication (B. S. R., 29, p. 847) 

 appearing in the paper by SmolS,k (E. S. R., 34, p. 648), the author emphasizes 

 his previous statement that Stereum purpureum is probably not the only organ- 

 ism concerned in the production of silver-leaf disease. 



Baspbeny diseases in Minnesota, G. R. Hoebneb {Minn. Hort.. Jf5 {1911), 

 No. 6, pp. 236-2^3, figs. S). — ^Brief description and discussion are given of gray 

 bark, or spur blight, anthracnose, crown gall, and yellows or curly leaf, which 



