750 EXPERIMENT STATION RECORD. 



factor. Nearly r»<> (liflercul cultnros hnvo ))oou jjrowu at tem])eratnros ranging 

 from 14 to 37° C. 



Cultures of Uredineae in 1912. 1913. and 1914, J. ('. Artiuk ( Myeolofjia, 

 7 (1015), No. 2, pp. 61-89; uhx. in Hciencc, n. set:, J,l (191.5), Xo. lOJfS, p. 172).— 

 In continuance of previous investigations (E. 8. IJ., L'G. p. 645) the author has 

 reported a large number of trials made, in which about 70 successful infections 

 were produced, involving about 30 species. About half the successful cultures 

 confirm previous work with the same species. A large number of the remainder 

 extended knowledge regarding the species, some showing that what had been 

 considered valid siiecies may be reduced to synonymy, while a few cultures 

 demonstrated the full life history of species never before cultured. 



Disease in oat seedlings, E. Voces (Deut. Landw. Prcsxc, Jfl (191^), Nok. 6^. 

 pp. 77.J, 77//. fifju. .?; 65, p. 782). — A study of nematodes in oats, also of a 

 fungus (Fu-sariu)ii didymum) found in the lower portions of the stem, is said to 

 show that the former cause comparatively little damage to the crop, but that in 

 the younger stages the latter may cause considerable injury when its presence 

 is associated witli bad soil conditions as regards texture, drainage, and balanc- 

 ing of fertilizers. 



A test of Indiana varieties of wheat seed for fungus infection, G. X. 

 IIoFFER (Proc. Ind. Acad. *S'r/.. 191.i. pp. 97, 98). — ^The author, reporting investi- 

 gations of 34 varieties of seed wheat, states that 14 wei*e free from fungi. 13 

 were infected with a Fusarium. 4 showed the presence of a Macrosporium. and 

 3 contained both these fungi. 



Resistance of different varieties of wheat to rust, F. Scurti and A'. Sica 

 (Ann. R. Stas. Chim. Agr. Sper. Roma, 2. sei:, 7 (191.',), pp. 33-56).— The 

 authors, reporting on experiments continued for three years on varieties of 

 wheat, state that the results thus far tend to confirm the conclusions announced 

 by Comes (E. S. R.. 30. p. 242) regarding a general relation between decrease of 

 acidity in tlie cell sap and diminution of x'esistance to disease in plants which 

 increases under cultivation. 



Beet rust, J. Eriksson (Rev. Gen. Dot., 25 his (1914), pp. 247-2-58, figs. 2).— 

 The author holds that TJromyces hetcr, which causes beet rust (decreasing the 

 sugar content of the root) may remain latent during the winter in the form of 

 intracellular mycoplasm. Exclusion of seed originating in districts not known 

 to be free from this disease is recommended. 



Irish potato scab (Oospora scabies) as affected by fertilizers containing 

 sulphates and chlorids, S. D. Conner (Proc. Ind. Acad. Sci., 1913, pp. 131- 

 137, fiffs. o). — Observations were made regarding the influence of certain fer- 

 tilizing agents on scab. 



It appeared that very little scab lived through the winter in a loamy soil, 

 while in soils of more open texture, as i>eat or sand, the spores survived. Sul- 

 I)hur (but not sulphates) apparently has a marked influence in reducing scab, 

 but chlorids increase the amount of that disease. 



Report of pathologist, D. H. Rose (Missouri Fruit Sta. Rpt. 1913-14. pp. 

 19-32, pis. 2). — A report is given of diseases of fruit trees and other plants, 

 some of which have been subjected to definite study, while others are merely 

 reported as having been observed. 



Among the apple diseases studied are said to be a pimple canker or measles, 

 several kinds of fruit six)t, ring rot or blossom-end rot due to SphcFropsis 

 malorum after frost injury, curly leaf, cankers, bitter rot, etc. The study of 

 the pimple canker of apples has shown that it is the same as that described in 

 Arkansas Station Bulletin 112 (E. S. R.. 29. p. 649). While numerous inocula- 

 tions have been made, using three different organisms obtained in cultures, no 

 positive results have been secured. Among the fruit sjwts studied are the 



