DISEASES OF PLANTS. 647 



fluorid, kronoleum, antorgan. and a proprietary preparation consisting of silico- 

 fliioric acid and zinc silioofluorid. A 3 per cent solution of sillcofluoric acid was 

 found to be more effective tban a 3 per cent solution of Itronoleum and antorgan 

 or a 1 per cent solution of copper silicofluorid and zinc silicofluorid. 



A siliceous wood preservative {Sci. Amcr., 108 {1913), No. 18, p. 401). — The 

 Marr process consists in impregnating wood for the purpose of preservation 

 with infusorial or diatomaceous earth susi)cnded in paraflin and naphthalene 

 for 4 hours. The advantage claimed over the paratlin-uaphthalene process is 

 that it penetrates the wood to the core. The mixture costs but 3 cts. per pound, 

 and less than 2 lbs. are necessary per cubic foot of timber. 



The artificial protection of wood with corrosive sublimate (kyanization), 

 F. Moll (Ztschr. Angew. CJiem., 26 (1913), No. 67, Aufsatzteil, pp. J,59-/t63, 

 figs. 6). — A historical review of the utilization of corrosive sublimate in the 

 preservation of wood, together with a description of some m(» !.-ni kyanization 

 plants. 



DISEASES OF PLANTS. 



Some little known but destructive diseases reported, L. Caesar (Ann. Rpt. 

 Ontario Agr. Col. and Expt. Farm, 38 (1912), p. 28).— The author briefly de- 

 scribes raspberry yellows, a gooseberry disease said to be due to an undeter- 

 mined fungus which enters the canes through openings made by insects, the 

 mosaic disease of tomatoes, and a disease of pine branches due to a species of 

 Peridermium, probably P. cerelyrum. 



The raspberry yellows is characterized by the curling and crumpling of the 

 leaves, and plants that are attacked should be dug out and burned, as they are 

 worthless. The presence of the mosaic disease of tomatoes may be recognized 

 in the mottled appearance of the leaves, dark and light areas alternating. The 

 causes of these troubles have not been determined. 



[Report on plant diseases, 1911], Johanna Westerdijk (PJiytopath. Lab. 

 "Willie Commelin Scholtcn'' Jaarver. 1911, pp. 21, pis. 2). — Besides brief men- 

 tion of publications issued, notes are given of studies on diseases affecting beets, 

 potatoes, onions, clover, etc., with treatments employed or suggested. 



[Report on plant diseases, 1912], Johanna Westerdijk (Phytopath. Lah. 

 "Willie Conimclin Scholtcn'' Jaarver. 1912, pp. 5-23). — This report, continuing 

 that above noted, deals also with diseases of cucumbers, cress, orchard trees, etc. 



[Observations on plant diseases], O. Schindler (Ber. K. LeJiranst. Obst u. 

 Gartenbau Proskau, 1912, pp. 49-51, fig. 1). — Brief notes are given regarding a 

 severe attack of Monilia on plum trees ; on American gooseberry mildew attack- 

 ing severely the more highly bred German gooseberry, the American varieties 

 proving nearly immune thereto; and on leaf curl of peach. 



[Plant injuries and diseases], R. Ewert (Bcr. K. Lehranst. Obst u. Gar- 

 tenbau Proskau, 1912, pp. 138, 14O). — Brief notes are given regarding the direct 

 influence of Bordeaux mixture on the sugar content in the sap of currants, 

 gooseberries, and grapes; Trichoseptoria fructigena attacking quinces and apples 

 in Germany; Phytophthora syringce on lilacs; and injuries to vegetation by coal 

 tar vapors. 



Another host for Rhodochytrium, F. A. Wolf (Phytopathology, 3 (1913), 

 No. 6, p. 311). — In addition to the host plants that have been reported for this 

 parasitic alga by Atkinson (E. S. R., 20. p. 550), the author reports haWng 

 found it upon Ambrosia trifida, near Montgomery, Ala. 



Nematodes or eelworms, G. Massee (Roy. Bot. Gard. Keiv, Bui. Mine. In- 

 form., No. 9 (1913), pp. 343-351, pi. 1, fig. 1). — Besides a presentation of some 

 general facts of parasitism, the author gives brief illustrated descriptions of 

 the parasitic activity of Heterodera radicicola, H. schaehtii, Tylenehus devasta- 



