1918] DISEASES OF PLANTS. 149 



The susceptibility of Phaseolus vulgaris to bean rust, E. Jordi {Ztschr, 

 Pflanzenkranlc, 26 (1916), No. 6-7, pp. 374, S75).— This is a brief account of 

 the considerable differences noted in tlie resistance offered to bean rust by 

 certain varieties of P. xmlgaris. 



On a sudden outbreak of cotton rust in Texas, J. J. Taubenhaus {Science, 

 n. ser., 1,6 (1911), No. 1185, pp. 267-269).— The author reports having had his 

 attention called in June, 1917, to an outbreak of cotton rust in Texas, the cause 

 of the disease being JEcidium gossypii. The distribution of the disease was 

 studied to some extent and attempts made to find the alternate stage of the 

 fungus on grasses, particularly species of Mulilenbergia or Sporobolus, but so 

 far without result. Investigation is being continued in the hope that the 

 Puccinia stage will be found, so that the host upon which the organism hiber- 

 nates may be discovered, thereby preventing further spread of the rust. 



Lightning injury to kale, L. R. Jones {Phytopathology, 7 {1917), No. 2, 

 pp. lJ!,0-lJt2, fig. 1). — A brief account is given of lightning injury to a field of 

 kale at Rochester, Mich. 



A physiological study of two strains of Fusarium in their causal rela- 

 tion to tuber rot and wilt of potato, G. K. K. Link {Bot. Gas;., 62 {1916), No. 

 S, pp. 169-209, figs. 13). — A detailed account of work previously reported 

 (E. S. R., 35, p. 246). 



The mosaic disease of potatoes, P. A. Mukphy {Agr. Gaz. Canada, 4 {1917), 

 No. 5, pp. 345-349, figs. 2). — Losses of varying importance due to potato mosaic 

 are indicated for localities in eastern Canada, extending westward. The dis- 

 ease varies somewhat in its manifestations as described. Though the infection 

 does not pass from one tuber to another through cut surfaces, it is perpetuated 

 by planting tubers from diseased hills. Experimentation is still in progress. 



Experiments in the control of potato leak, L. A. Hawkins {U. S. Dept. 

 Agr. Bui. 577 {1917), pp. 5).— In a previous publication (E. S. R., 35, p. 751), 

 the author described a disease of potatoes due to Rhizopus nigricans, or, more 

 frequently, to Pythium debaryanum. 



In the present paper an account is given of experiments in the control of 

 the disease, with additional data on the causal organism and its occurrence in 

 the delta soils of California. It has been found that the disease most fre- 

 quently follows injury to tubers due to wounding at the time of digging and 

 to breaking off the knobs. 



Avoidance of wounds and sorting out and shipping or storing separately the 

 wounded tubers are recoraiiii<nded as preventive measures. 



Losses of potato growers, E. J. Wortley {Rpt. Bd. Agr. Bermuda, 1914-15, 

 pp. 24-27). — An inheritable potato leaf roll of obscure but probably nonpara- 

 sitic causation is said to correspond somewhat closely as regards symptoms 

 with the one described by Orton (E. S. R., 30, p. 649). A description is given 

 of potato mosaic, with an account of tests supposed to show that this disease 

 is transmitted from mosaic parents, and that the yield from mosaic plants is 

 less than half that from healthy stock. The trouble in Bermuda is thought 

 to originate in the localities named from which the seed potatoes are obtained. 



Report on potato diseases in Bermuda, W. A. Orton {Rpt. Bd. Agr. Ber- 

 muda, 1914-15, pp. 13-15). — Local conditions greatly favor Phytophthora in- 

 festans, the control of which requires thorough and frequent spraying by means 

 of powerful spray pumps with improved nozzles to reduce the liquid to a fine 

 mist, also rigid selection of seed potatoes, and, if possible, a more resistant 

 variety than those now in use locally. Common scab {Oospora scabies), rus- 

 set scab (Rhlzoctonia), and blackleg are now of minor importance here. Curly 

 dwarf and mosaic exist on the island, as does also a leaf roll which has not 



