752 EXPERIMENT STATION RECORD. [Vol.41 



Wester (E. S. R., 39, p. 458). Attention is called to the appearance of sus- 

 ceptibility in varieties formerly listetl a.s immune ; also of partial or complete 

 immunity appearing in other varieties which are indicated. 



Carnation stem rot and its control, G. L. Peltier {Illinois Sta. Bui. 223 

 (1919), pp. 519-601, figs. 5). — The author describes some experimental work 

 undertaken with a view to the control of carnation stem rot due to Rhizoctonia 

 solani noted in a previous publication (E. S. R., 35, p. 749). The general 

 character of the fungus, together with an account of its occurrence, is given. 

 The conditions influencing the growth of the parasite and host plant are de- 

 scribed at considerable length, and accounts are given of experiments carried 

 on in the greenhouse for the control of the stem rot. 



From the data obtained, it appears that the control of stem rot of carnation 

 is to be studied along the lines of growing conditions and the use of clean 

 soil. Soil disinfection proved of little value, but steam sterilization has been 

 quite effective. In growing carnations the temperature should be kept as low 

 as possible, and no more water applied to the soil than is absolutely necessary 

 for the healthy growth of the plant. These statements apply also to the grow- 

 ing of the seedlings and cuttings. Steam sterilizaion of soil and sand is 

 recommended to be used wherever possible. 



Snapdragon rust, G. L. Peltier {Illinois Sta. Bui. 221 {1919), pp. 535-5^(8, 

 figs. 5). — A description is given of rust of snapdragon due to Puccinia antir- 

 rhini, which is known to have been present in California since 1879 and which 

 appeared in Illinois in 1913, since which time it has become the cause of 

 considerable loss. The symptoms of the disease, description of the fungus, 

 and host relationship and resistance are described, after which an account 

 is given of experiments for its control. The use of Bordeaux mixture, am- 

 mouiacal copper carbonate, or Fungine can neither prevent, check, nor con- 

 trol it in the field or greenhouse. 



Important relations were established between the spread of the fungus and 

 the conditions under which the plants were grown. It is claimed that the 

 practice of syringing plants in the greenhouse is favorable for the dissemina- 

 tion of the spores and the rapid infection of the plants. Watering from below 

 only, so as to avoid wetting the foliage, Is a means of checking the rust. The 

 rust was not found to be carried on the seed, and it is believed that the 

 disease could be avoided by the propagation of plants from seed instead of 

 cuttings. 



Some diseases of trees in greater New York, A. H. Graves {Mycologia, 11 

 {1919), No. 3, pp. 111-12-i, pi. 1). — The author gives some results of studies dur- 

 ing the summer of 1918. The diseases noted, with associated fungi (which 

 were not identified with certainty in all cases), include a bark disease 

 {Melanconium sp.) of butternut {Jtiglans cinerea), canker {Nectria sp.) of 

 sweet birch {Betula lenta), winter injury or leaf scorch of beech {Fagns 

 atropunicea), heart rots (several fungi) of oaks {Qucrcus spp.), disease of 

 the white oak {Q. alba), bark disease {Creonectria purpurea) of the paper 

 mulberry {Broiissonetia papyrifera), blight {Chjomonia venata) of sycamore 

 {Flatanus occidentalis) , and heart rot {Pyropolyporus robiniw) of locust 

 {Robinia pseudacacia). Severe injury to trees during 1917 and 1918 is 

 ascribed to the unprecedented combination of unfavorable winter conditions. 



[Direct] transmission of blister rust from pine to pine, C. von Tubeuf 

 {Naturto. Ztschr. Forst u. Landic, 16 {1918), No. 3-8, pp. 280-282) .—This is a 

 discussion of recent contributions on tlie life history of pine rust {Peridermium 

 pini). 



Diaporthe taleola, an ascomycete injurious to oaks, M. Moreillox {abs. in 

 Internatl. Inst. Agr. [Rome], Inteniatl. Rev. Sci. and Pract. Agr., 9 {1918), No. 



