52 EXPERIMENT STATION EECOED. 



A disease of the peanut caused by Bacterium solanaceanim, H. R. Fulton 

 and J. R. Winston {North Carolina Sta. Bicn. Rpt. 1913-l.i, pp. 43-^7, figs. Jf). — 

 In August, 1912, peanuts of the Spanish variety were observed in Granville 

 County, N. C, as badly diseased, in some cases 15 per cent of the plants being 

 affected. Examination showed that they were infected with B. solanacearum, 

 the same species as that causing Granville wilt of tobacco. 



Since the peanut has been proved susceptible to attacks of this organism, atten- 

 tion is called to the fact that it can no longer be recommended for use in crop 

 rotation. 



Fungus parasites of the pigeon pea, E. Rangel {Bol. Agr. [Sao Paulo], 

 16. ser., No. 2 {1915), pp. 1^5-156, figs. 3). — Descriptions are given of the 

 following new species of fungi found parasitic on pigeon peas in Brazil : Vellosiella 

 cajani {Ccrcospora cajani), C. instahilis, C oil ctoi rich um cajani, Phyllosticta 

 cajani, and Phoma cajani. The first mentioned is a new genus and species based 

 on Cercoftpora cajani described by Hennings in 1902. 



Infection experiments with the potato blight fungus, G. Smith {Jour. 

 Southeast. Agr. Col. Wye, No. 22 {1913), pp. 494-496) .—The author claims to 

 have shown that spores of Phytophthora infcstans, which freely attack Solanum 

 aviculare in Australia, are also able to infect this species in England without 

 a process of gradual adaptation, but he reports that it did not infect tomato, 

 jS. dulcnmara, or S. nigrum. 



A biochemical study of the root rot of sugar beet, J. BooN^iR {Bot. Kiizlcm. 

 [Budapest], 13 {1914), No. //, pp. 114, 115; ahs. in Bot. Ccnthl., 126 {1914), 

 No. 24, p. 644)- — Sugar beets showing root rot gave less cane sugar and water 

 but a larger content of invert sugar, ash, aluminum, and acid than sound roots. 



Invertase could be demonstrated in the diseased but not in the sound beets, 

 this fact being correlated with the degree of vitality of the bacteria in the dis- 

 eased roots. 



Sereh in relation to sugar production, F. B. Fellinga {ArcJi. Siiikcrindus. 

 Nedcrland. Indie, 23 {1915), No. 3, pp. 71-84).— It is stated that the de- 

 generative disease of sugar cane known locally as sereh is becoming more and 

 more prevalent in Java, affecting the more productive and common native cane 

 by lowering both the quality and quantity of the sap output. The disease is 

 said to agree with type No. 4 of those described by "Wakker and Went (E. S. R., 

 10, p. 56). 



Selection of productive stock absolutely free from sereh and maintenance of 

 the most favorable cultural conditions are deemed imperative. 



The comparative susceptibility of varieties of swedes and turnips to the 

 swede mildew (Erysiphe polygoni), G. O. Seable {Jour. Southeast. Agr. Col. 

 Wye, No. 22 {1913), pp. .'/S7--'/M).— Results are tabulate<l for tests in the 

 summer of 1913 with each of 34 varieties of swedes, 41 of turnips, and 2 of 

 rape from seefl obtained from five well-known .^seed merchants in England and 

 Scotland. Every plat was attacked to a greater or less extent, the swedes and 

 rape more severely in general than were the turnips. Crop results are also 

 Indicated. 



Chlorosis of plants with special reference to calico of tobacco, G. P. 

 Clinton {Connecticut State Sta. Rpt. 1914, Pt- 6, pp. 357-424, pis. 8).— After a 

 discussion of chlorosis in plants and the various theories regarding its cause, the 

 author gives brief descriptions and results of nearly 300 experiments conducted 

 during the years 1906 to 1914, inclusive, to determine the nature and control 

 of the mosaic or calico disease of tobacco. 



As a result of the investigations, it is claimed that calico of tobacco is pri- 

 marily a disease of the chlorophyll of the infected plants. It is infectious, and, 

 to a certain extent, contagious. It can be communicated to the leaves through 



