DISEASES OF PLANTS. 649 



to which the crop is subject. Auions those mentioned are Contarinid torqurns, 

 Anthonniniiia sp., Barlx sp., Phoma olcracca, etc. In adclition to these, descrip- 

 tions are jriven of some frouhles dne to faulty cultivalloii. 



Corky scab of potatoes {Jour. lid. Agr. [London \, /•> (lOOS), .Yo. H, i>p. 

 592-599, pi. J). — A description is jiiven of corl<y scab of potatoes caused by the 

 fungus Spongosponi .scabirx. This funj^us is said to be al)iuulant in Great 

 Britain, Ireland, and Norway, and found to some extent in (Jerniany. 



Soaking diseased potatoes for 2 hours before planting in a solution consisting 

 of i pt. of formalin in 15 gal. of water is recommended. The application of lime 

 to the soil would probably aid in checking the disease. 



Black scab in potatoes (Dcpt. Agr. and Tech. Instr. Jrcldnd Jour.. 8 {1908), 

 No. 3, pp. .'I'll-'i'iS, pi. 1). — A description is given of the black scab, or wart 

 disease, of potatoes, due to the fiuigus <.'lnijsop]ilj/ctif< cndohiotiat, which is a})- 

 parently becoming very serious in parts of Great Britain. Preventive measures 

 which include rotations in wliich potatoes do not occupy the soil for a considei-- 

 able number of years are recommended. 



An important new potato disease in Germany, G. Schneider {Deut. Landw. 

 Presse, 35 {1908), \o. 79, p. S32. figs. 2). — An illustrated account is given of the 

 wart, or black scab, of potatoes due to Chriisoitlihntix cndohiotlca, which has 

 lately appeared in parts of (Germany. 



The occurrence of Chrysophlyctis endobiotica in Westphalia, A. Spiecker- 

 MANN (ProLt. HI. P/hin.zcnbau u. Kchulz. n. scr.. 6 {I90S). Xo. 10, pp. J 13-116, 

 figs. 2). — A descrii)tlon is given of the wart disease of potatoes due to C. 

 endobiotica, togethei* with suggestions for the prevention of the spread of that 

 pest. 



Recent investigations of potato diseases, and of diseases of potatoes and 

 root crops during- storage, F. K. R.wn {Tidsfikr. Landbr. Plantcavl, 15 {1908), 

 No. 2, pp. 3',',-.r,',). 



Fire b^ght in fruit trees, \V. B. Mack {Nevada Sta. Bui. 63, pp. 52, 53). — 

 Attention has been directed to a disease of apple trees. An examination showed 

 that the trouble was of bacterial origin and that undoubtedly the organism is 

 Bacillus amylororus, the species which causes the bacterial blight of pears, 

 apples, and quinces. The disease is said to be of common occurrence in the 

 vicinity of the station and is causing material damage to the orchards. It is 

 to be the subject of further investigation. 



The leaf browning of sweet cherries in Germany, K. von Tubeuf {Naturio. 

 Ztschr. Forst u. Landw., 6 {1908), No. 6, pp. 330-332, figs. 3; abs. in Bot. 

 Centbl., 108 {1908), No. l.'i, p. 365). — An account is given of a disease of sweet 

 cherries, due to (Inonionia rr]ithrostonta, which has recently made its appear- 

 ance in the Bavarian Palatinate. The fmigus has api»eared in great abundance, 

 causing a browning of the leaves, and is characterized by the leaves remaining 

 attached to tlie trees during the winter. The si)ores are said to be 2-celled 

 Instead of 1-celled, as previously reported by Fi'ank. 



The effect of various copper preparations and other fungicides on the 

 flowers of the grape, E. .Moi.z (.1////. Wcinbau u. KelUrw., 20 {1908), No. 6, 

 pp. 81-91, fig. I). — Till' effect of 2 applications of several fungicides and in- 

 secticides on the flowers of the grai)e was investigated. The treatments were 

 made in June and .Inly, intervals of about 10 days occurring between the aiM>li- 

 catlons. Among the substances employed were soda Bordeaux mixture, neutral 

 copper acetate, azurin, a ftmgiclde the formula of which is recommendal by 

 Vermorel, several dust preparations of .Xordlingcr. Xonnit, and sulphur, com- 

 parisons being made with Bordeaux mixture, a 1 per cent solution of which 

 was used in the lirst s[iriiying and a 2 ju-r ctMit solution in tlu' second. 



