46 EXPERIMENT STATION EECOED. 



Tlie streak disease of sweet i:»eas is said to be cliaracterized by browu streaks 

 along parts of the stem and a yellowish tinge in the foliage, wbicb fails to 

 develop properly. Tlie flower buds become yellow and drop witbout opening, or, 

 in less advanced cases, open and show brownish or yellowish marks on the 

 petals. 



An examination of plants affected by this disease showed the presence of the 

 fungus T. 'basicola, and a series of experiments was planned to determine 

 methods of control. In pots which were made acid or alkaline by the addition 

 of fertilizers, sweet peas were planted and half the pots inoculated w^ith the 

 "fungus, but in uo case did the resulting plants show any indication of disease. 

 In a subsequent experiment the plants after attaining a growth of about 1 ft. 

 in height were heavily overwatered and kept so for several days. The effect 

 of this was very marked. Those in the uninoculated soil were slightly checked 

 in growth, but with proper treatment subsequently as regards watering they 

 recovered, while 75 per cent of those in the inoculated soil showed the develop- 

 ment of the disease. It appears that the fungus attacks only the plants that 

 have in any way been weakened, and care should be exercised to secure a good 

 active growth to prevent the appearance of the disease. 



Physalosporina, a new genus of Pyrenomycetes, N. Woronichin {Ann. 

 Mycol., 9 (1911), No. 3, pp. 217-225; ahs. in Bui. Trimest. 8oc. Mycol. France. 

 21 (1911), JS'o. 3, p. 399). — A description is given of the genus and of the 6 

 species studied, also a comparative table of the characters of these species, 

 named as follows : P. mcgastoma, P. ohscwra, P. astragalina, P. astragali, P. 

 caragance, and P. tranzschelii. 



New studies on Plasmodiophoraceae, R. Maire and A. TisoN (Ann. Mycol., 

 9 (1911), Xo. 3, pp. 226-2 'lO, fig. 1; ahs. in Centhl. Bald, {ctc.^, 2. AM., 32 

 (1912), No. 6-12, pp. 32S, 329).— The authors here make a fuller report and 

 continuation of previous work (E. S. R., 21, p. 423; 25, p. 43), summarized as 

 follows : 



Tetramyxa parasitica is one of the Plasmodiophoraceie, its endophytic de- 

 velopment being similar in the main to that of other members of the family. 

 Fungi of the genus Ligniera, which also belongs to this family, develop in 

 roots of various plants but do not produce tumescence. The parasite T. 

 triglochinis is separated to form a new genus, Molliardia. 



The relation of the family to the allied forms is also discussed. 



Scleropycnis, a new generic type, H. and P. Sydow (Ann. Mycol., 9 (1911), 

 No. 3, pp. 277, 218, figs. .'/; at)S. in Bui. Trimest. Soc. Mycol. France, 27 (1911), 

 No. 3, pp. JfOl, Jt02). — A comparison is made of closely related species with this 

 new form, which is described under the name S. abietina n. sp. 



A culture study of Hyalopsora polypodii, P. Dietel (Ann. Mycol., 9 (1911), 

 No. 5, pp. 530-533; ahs. in Ztschr. Landw. Versuchsw. Ostcrr., IJf (Wll), No. 

 12, p. -/^77). — It is claimed as a result of these investigations with Hyalopsora 

 on Cystoptcris fragilis, continued for 2 years, that this fungus can and does 

 normally preserve and perpetuate itself by means of uredospores. These live 

 through the winter and renew the fungus which, so far as its mycelium is con- 

 cerned in the cases studied, dies out completely before spring. Teleutospores 

 appeared rarely in these experiments and their role in the case of this fungus 

 was not ascertained. 



Parasitism of Nectria and Fusicladium, E. Voces (CentU. BaM. [etc.], 2. 

 Aht., 32 (1912), No. 20-25, pp. 5-',0-551, figs. 2 ) .—Continuing previous studies 

 (E. S. R., 24, pp. 448, 450), the author discusses the nutritive relations of 

 species of Fusicladium and Nectria, holding as the result of observations by 

 himself and others that while Nectria is to be considered only a so-called 

 " wound-parasite " Fusicladium is a true parasite. 



