648 EXPERIMENT STATION RECORD. 



crops, and the stem eelworm (Tylnichit.s devostairix), whicli is reported as 

 hiiviiifT beeu observed on nunierons field crops and nursery stocli. Notes on the 

 life history of the different nematodes are given and preventive and remedial 

 measures suggested for their control. 



Experiments with tomato blight, H. B. Orr (Northwest Hort.. 20 (1907), 

 Xo. 1, pp. 3, .)). — An account is given of experiments carried on by the author 

 which seem to indicate that the severity of attacks of tomato blight is increased 

 in proportion to the potash content of the fertilizers applied to the crops. 



Cranberry diseases, C. L. Shear (Oeorge Washington Univ. Bui., 5 (190H), 

 No. 4, pp. 75-78). — An abstract of a thesis presented to the faculty of graduate 

 studies of the university by the author, in which an account is given of cran- 

 berry diseases and experiments for their control. 



The diseases described are the blast and scald caused l)y (liiinnardia sp., an 

 anthracnose due to a species of Gla^osporium, and a rot which is attributed to 

 an undescribed genus of fungus, to whicli the name Acanthorhynchus is given. 



For the control of these diseases the author states that experiments have 

 shown that Bordeaux mixture is the most effective fungicide. Experiments 

 carried on in 1904 showed that the percentage of disease could be very mate- 

 rially reduced by spraying, and in 1905, under more favorable conditions, plats 

 which received ") api)licatious of the fungicide yielded only 6 per cent of rotten 

 fruit, as compared with more than 91 per cent on unsprayed plats. 



A popular bulletin on these diseases has been noted previously (E. S. K., 17. 

 p. 51). 



The bacterial disease of ginger, Y. Uyeda (Ccnthl. Bdlt. \ctc.'^, 2. Aht.. 17 

 (1906), No. 11-13, pp. 383, 38Ji, pjs. 2).—X brief note is given on a bacterial 

 disease of Zingiber officinale, v/hich has beeu under observation for about l^ 

 years in Japan. 



The organism has been isolated, and inoculation experiments show that it is 

 capable of causing the disease. A study of the organism has shown that it is 

 probably a new species closely resembling Bacillus omnirorus. 



A further contribution to the infectious chlorosis of mallows, E. Baur 

 (Ber. Dent. Bot. Gesell, 24 (1906), No. 8, pp. Jfl6-Ji28).— In continuation of a 

 previous paper (E. S. R.,' 18, p. 453) the author gives additional accounts of 

 infectious chlorosis of a number of species of malvaceous plants. An immune 

 strain of Ahutilou striatuni is described, and an account is given of the immu- 

 nity of Lavatera arhorea. The effect of light on the formation of virus of 

 chlorosis in the leaves is discussed, after which the author describes experi- 

 ments on the transnnssion of chlorosis by seed and also reports the occurrence 

 of chlorosis on p.lants of other genera, particularly Cornus. Ligustrum, and 

 Laburnum. 



Soil treatment for the forcing house, A. D. Seley (Ohio Sf'i. Vlrc. 57, pp. 7, 

 figs. 2). — An account of investigations for the control of rosette (Rhizoctonia 

 sp.) in lettuce and tomatoes and of nematodes in crops grown under glass. 



Experiments have been carried on for .3 years in testing soil sterilization with 

 steam and formalin, and the author has found that for the destruction of fungi 

 in the soil the formalin treatment and the steam treatment appear to be of 

 about equal efticiency. In the case of nematodes, steaming appears to be the 

 only effective treatment, particularly for the destruction of the encysted ferms 

 of nematodes. Directions are given for the treatment of soil with formalin and 

 steam, and the comparative advantages and disadvantages of each are pointed 

 out. 



Some causes contributing to the black rot of apples due to Sclerotinia 

 fructigena, K. Moj.z (Venthl. Bukt. [ete.\. 2. Mil.. 11 U9()6), A o. .7-7, pp. 175- 



