448 EXPERIMENT STATION EECORl). 



An anthraciiose of red clover caused by Gloeosporium caulivorum, H. R. 

 Fulton {Abs. in Science, n. ser., 31 (1910), No. 802, p. 752). — A description is 

 given of an anthracnose of clover which is characterized by sunken areas on 

 the stem, the spots having dark borders and lighter centers. 



Inoculation tests indicate that infection takes place most readily through 

 wounds, or upon succulent parts, or under very moist conditions. Under field 

 conditions the disease may spread rapidly during warm showery weather. 

 Successful inoculations were made with the organism on various varieties of 

 red and alsike clover, but unsuccessful attempts were made to inoculate white 

 clover and alfalfa. 



Rotation of crops and early mowing of affected fields are recommended as 

 control measures. 



Four years' results in selection for a disease-resistant clover, S. M. Bain 

 and S. H. Essary {Abs. in Science, n. ser., 31 (1910), No. 802, p. 756).— In 1906 

 the authors described a disease of clover due to Colletotrichum (E. S. R., IS, 

 p. 448), and in the present paper an account is given of the results of selec- 

 tions for disease resistance. This resistance has been maintained in a number 

 of varieties for five consecutive generations, and about 50 acres of resistant 

 clover is being grown as a seed crop in 1910. 



In addition to the account relating to resistance to the anthracnose, atten- 

 tion is called to the possibility of resistance to rust. 



A new hop mildew, J. J. Davis (Abs. in Science, n. ser., 31 {1910), No. 802, 

 p. 752). — A downy mildew of hops is described, which is said to be due to 

 PsciKloperonosporu celtidis humuli n. var. 



The wilt disease of pig'eon pea and the parasitism of Neocosmospora vasin- 

 fecta, E. J. Butler {.Mem. Dcpt. Agr. India, Bot. Ser., 2 (1910), No. 9, pp. 6.'i, 

 pjg_ g). — In investigations carried on b.v the author regarding the wilt diseases 

 of cotton, indigo, chick peas, and pigeon peas, inoculation with the ascospores of 

 .Y. t-asinfecta did not result in a single case of wilt. He concludes that this 

 fungus is a common soil saprophyte, which develops its perfect form on rotting 

 roots of several different plants and is wholly unconnected with the wilt diseases 

 of the particular plants investigated thus far in India, and he questions whether 

 the fungus is parasitic in the United States. 



In his study of the pigeon pea wilt the author has found constantly present a 

 species of Fusarium and associated with it three other organisms, but he at- 

 iributes the wilt to the Fusarium, which he describes under the name F. ndum 

 n. sp., a preliminary account of which has already been noted (E. S. R., 23, 

 p. 24G). A description is given of the parasite and its cultural and other 

 biological characters, followed by a discussion of the possibility of controlling it 

 by means of breeding resistant strains. 



Bacillus phytophthorus, E. F, Smith (Abs. in Science, n. ser,, 31 (1910), No. 

 802, pp. 7^8, 7Jf9).—A report is given of an extended study on this organism, 

 which causes in Germany the disease of potatoes known as blackleg. The cause 

 of this disease has been described by Appel (E. S. R., 15, p. 374) and the author 

 has verified his conclusions. 



The disease caused by this organism is compared with that due to B. solani- 

 saprus (E. S. R., IS, p. 646) and B. atrosepticus, and it is stated that the organ- 

 isms are similar but not identical. The organism of the blackleg of potatoes 

 has been isolated by the author from potatoes grown in Maine and in Virginia, 

 indicating that it is widespread in this country. 



Further studies of Phytophthora infestans, L. R. Jones and B. F. Lutman 

 (Abs. in Science, n. ser., 31 (1910), No. 802, pp. 752, 753).— A description is 

 given of investigations that have been carried on with this potato parasite. As 



