548 EXPEEIMENT STATION EECORD. 



tions of the author indicate that it is of a bacterial nature, and that the same 

 organism produces somewhat similar diseases on various species of clover, on 

 garden beans, and on soy beans, although only one variety of soy beans grown 

 at the station shows much injury. The disease is said to be most active during 

 the flowering period of the host, and at times almost entirely destroys the 

 crop. The season of heavy dew appears to be a time which favors infection. 

 The morphology, cultural characters, physical and biochemical features, and 

 pathogenicity of the organism are described at length. 



A bibliography is appended. 



The life history of Ascochyta on some leguminous plants, II, R. E. Stone 

 {Phytopathology, 5 (1915), No. 1, pp. Jt-10, fig. 1). — In a previous publication 

 (E. S. R., 28, p. 845) the author reported Mycosphccrella pinodes as the perfect 

 stage of A. pisi, and A. lethalis as a part of the life cycle of If. lethaUs. 



In the present publication a description is given of A. lathyrl from the grass 

 pea (Lathyrus sativus), which is associated with M. ontariwnsis n. sp. The 

 Mycosphserella follows the Ascochyta in the field, and in inoculation experi- 

 ments typical Ascochyta developed on the plants, followed by Mycosphserella, 

 which is indistinguishable from the original material. In all cases check 

 plants remained free from the disease. 



Notes are given of conditions for ascospore development in M. pinodes and 

 M. ontaricensis. 



The Bhizoctonia lesions on potato stems, F. L. Deayton (Phytopathology, 5 

 (1915), No. 1, pp. 59-63, pi. 1, fig. 1).—A report is given of a study of the 

 dark brown lesions occurring on the underground main stems and tuber-bearing 

 stolons of the potato, and generally considered as due to the presence of 

 Ehizoctonia. 



The result of the investigation showed the presence of mycelium in the 

 lesions and the permeation of nearly all the tissues, which leaves little doubt 

 that Rhizoctonia is the cause of the trouble. The invasion and plugging of 

 the vascular tissues, diverting the food material going from the leaves to the 

 actively growing parts, account for the production of undersized tubers or 

 none at all. By the stopping of the upward current through the plugging of 

 the vessels, especially in dry weather, a curling of the leaves may be produced, 

 and this is nearly always a symptom associated with the disease. 



Puccinia endiviae and rust of prickly lettuce, L. Maffei {Riv. Patol. Veg., 

 7 (191Jf), No. 2, pp. 45, 46). — It is stated that the " scariola," claimed by 

 Pantanelli and Cristofoletti (E. S. R., 31, p. 746) to be attacked by P. endiviw, 

 is apparently not Lactuca scariola, but endive (Cichorium endivia). 



Protascus colorans, the source of yellow grains in rice, P. C. van dee Wolk 

 (Mycol. CentU., 3 (1913), No. 4, pp. 153-151, pi. i).— The author has investi- 

 gated the subject of yellow grains in rice kept long in bulk, which is said to 

 cause considerable loss and disturbance in marketing the rice exported from 

 the Indies to Europe. 



The trouble is said to be caused by a fungus, hitherto undescribed as to 

 genus and species, which the author has named P. colorans, which is said to 

 show a very variable number of ascospores (2 to 15), and which is otherwise 

 discussed. The best development of this fungus requires a very small mois- 

 ture content in the rice grains, experiments often failing to develop the organ- 

 ism on account of its low tolerance of humidity. Pigment fomiation is prob- 

 ably a phenomenon of the dying away of the fungus, which fact may explain 

 why it is very difficult to rear this mold from the yellow grains themselves, 

 and this also in turn may explain the rise of a brooding theory of this rice 

 injury. 



