DISEASES OF PLANTS. 61 



rows sprayed with iron sulphate before the leaves had expanded pro- 

 duced a larger amount of fruit than any of the other rows. Further 

 experimentation, however, is necessary to determine the value of this 

 treatment. It is stated that the sulphuric-acid treatment, which has 

 been recommended and which is preliminarily reported upon in the 

 above-numbered bulletin, has proved to be too strong to be used suc- 

 cessfully on raspberries. The treatment recommended by the author 

 consists of 3 sprayings with Bordeaux mixture, beginning when the 

 canes are about 6 inches tall, the other applications to follow at inter- 

 vals of about 2 weeks. When the disease is severe, the cane should 

 be cut out and removed from the field as soon as the fruiting season is 

 over. 



Modern plant pathological research, J. ERIKSSON (A", landt. Akad TTandl. Tidskr., 

 36 (1897), pp. 90-! >9). 



The diseases and injuries of cultivated plants, I, J. Ritzema Bos (Ziekten en 

 Beschadingingen der kultnurgewassen. Groningen: J. /»'. Wollers, 1897). 



Concerning the influence of age and temperature on the germination of fungus 

 spores, C. Wehmer (Centr. Bl. Buhl. u. Par., 2. Alt., 3 (1897), Xo. 4-5, pp. 104-108). 



Evolution of the spores of Pyrenomycetes, E. Lambotti (Rev. Mycol., 19 (1897), 

 Xo. 74, pp. 48-52). — Notes are given on the Sphaeriaceae. 



Concerning the mycelium of .^EJcidium magellanicum, P. Magnus (Her. dent, 

 hot. Gesell., 15 (1S97), Xo. 2, pp. 148-152, pi. 1). — The author figures and describes the 

 mycelium of Mcidium magellanicum, which is parasitic on Berberis vulgarus, often 

 causing hexenbesens in its host. 



Concerning oriental plant galls, II. Focken (Rev. G4n. Bot., 9 I 1897 . Xo. 99, pp. 

 103-118, pis. 2, figs. 4). 



Recent investigations concerning the causes of potato rot, Frank (Dent, 

 landw. Presse, 24 (1897), Xo. 14, pp. 118, 114). 



Investigations on some potato diseases in 1896, K. Sajo (Ztschr. Pflanzenkrank., 

 7 (1897), Xo. 1, pp. 4-8). 



Potato diseases and their prevention, W. M. Schoyen ( Tidsskr. norske Landbr., 

 1896; abs. in Ztschr. Pflanzenkrank., 7 (1897), Xo. 1, p. 40). 



Bacterial gummosis of the sugar beet, Sorauer (Blatter Eiibenbau, 4 (1897), p. 

 81; ahs. in Chem. Ztg., 21 (1897), Xo. 35, Repert., p. 102). 



Are the Enchytreeidae parasitic on the sugar beet ? J. Stoklasa ( Centr. Bl. Bakt. 

 u. Bar., 2. AM., 3 (1897), Xo. 4-5, pp. 108-110).— A beet was planted iu a glass dish in 

 soil free from deleterious matter or organisms. Enchytraeidse washed in distilled 

 water were then placed iu the soil. A few days later an examination showed that 

 they had attacked the beet root. Closer examination left no doubt as to their living 

 upon the contents of cells of the plant, and that they are therefore to be considered 

 as parasites of the beet. 



On a supposed verminal disease of truffles, J. Chatin (Compt Rend. Acad. Sci. 

 Paris, 124 (1897), Xo. 17, pp. 903-905).— The nematodes, Petodera strongyloides and 

 Leptodera terricola, commonly found in truffles, are shown not to cause the disease of 

 these fungi. Their existence within the fungi is symbiotic. It is also noted that 

 other nematodes are often confounded with Tylenchm derastatrix in the verminal 

 disease of the onion, but that they are in reality harmless saprophytic forms that 

 only resemble superficially' the destructive worm. 



On the injury of plants by asphalt vapors, P. Sorauer (Ztschr. Pflanzenkrank., 

 7 (1897), Xo. 1, pp. 10-20). 



On the effect of the more common fungicides (Ztschr. Pflanzenkrank., 7 (1897), 

 Xo. 1, pp. 44-47). 



3612— No. 1 5 



