242 EXPEKIMEISTT STATION RECORD. 



young nuts due, respectively, to Gloeosporium sp. and Diplodia palmicola, non- 

 setting of fruit ascribed to defective pollination, and chlorosis ascribed to de- 

 fects in ventilation and drainage. 



A carnation wilt is attributed to a Fusarium which is under investigation. 



Diplodia pinea is found to attack and kill nursery stock and adult trees in 

 seven species of pines. 



Dry rot of maize {Diplodia inaydis), which causes increasing loss, is retarded 

 by addition of lime to the soil. A root disease of maize is ascribed to a Fusarium. 



Puccinia graminis is under investigation as regards means of control. 



A study of bacterial disease of mango by Ethel M. Doidge is briefly reported 

 upon. Inoculation experiments have been only partially successful. 



A new disease of Schinus molle is reported as attacking nursery stock 12 to 

 18 in, high, causing black spots on the stems, and also on the leaves, which soon 

 dry up, but usually not attacking the woody stems of the second season's 

 growth. It is ascribed to an undescribed species of Colletotrichum, and has 

 been controlled with Bordeaux mixture. 



In continuation of investigations by Miss Doidge on potato disease (E. S. R., 

 3.3, p. 742), black lieart in imported potatoes is found to be due to abnormal 

 temperatures during transit. Fumigation tests with tubers employing formal- 

 dehyde gas showed little or no injury. 



A short list is given of publications issued during the year. 



The probable nonvalidity of the genera Botryodiplodia, Diplodiella, Chreto- 

 diplodia, and Lasiodiplodia, J. J. Tauhexhais {Avier. Jour. Bot., 2 (1915), No. 

 7, pp. 32.i-331, pis. 8). — The author reports a further study of the fungus desig- 

 nated as L. tuhcricola, the cause of Java black rot of sweet potato (E. S. R., 

 30, p. 150), but suspected to be really a Diplodia. 



As a result of this work, the author concludes that the genera Lasiodiplodia. 

 Chaetodiplodia, Botrj^odiplodia, and Diplodiella are not tenable, and that their 

 species should be placed in the genus Diplodia, which is retained becaiise of its 

 priority. It is thought probable that further work will show the nece.ssity of 

 abolishing the genera Rhyncodiplodia and Pellioniella, and that more work will 

 further reduce the large number of species of Diplodia. 



A bibliography is given. 



The biology of Puccinia arenariae, F, Wilij: {Ber. Deut. Bot. OcselL, 3S 

 {1915), No. 2, pp. 91-95). — Describing five series of tests made with P. orenari<p 

 from various hosts on different plants, the author concludes that while sharp 

 specialization was not established, a degree thereof may have ])een indicated 

 by the results of some inoculations as noted. 



New Chinese fungi, I. Miyake {Bot. Mag. [Tokyo], 28 {19U), No. 327, pp. 

 37-56, pi. 1). — The author reports having collected in northern Cldna in 1912 

 a number of fungi, of which he has named as new species Pleospora lespcdezcB 

 on stems of Lespedeza hicolor, Rehmiella ulmtcola on leaves of XJlmus sp., 

 JEcidium callistepfii on leaves of Calli^tephus .sinensis. Coniothyrium fi/ior on 

 leaves of Tilia cordata, C. spirwce on leaves of Spircea pubcsccns, Scptoria 

 perillw on leaves of Perilla ocimoides, and Septogloeum anemones on leaves of 

 Anemone sp. 



Parasitism of Comandra umbellata, G. G. Hedgcock ( V. S. Dept. Agr., Jour. 

 Agr. Research, 5 {1915), No. 3, pp. 133-135). — On account of C. nmbcUata serv- 

 ing as a host for the alternate or summer stage of the heteropcious rust, 

 Peridermium pyriforme, the author has investigated the root system of this 

 and a related species and has found C. ttmbeUata parasitic on 50 species of 

 plants covering a wide range of families, and. in addition, it was found on at 

 least 3 unidentified species of grasses. 



