DISEASES OF PLANTS. 657 



A sorghum disease in TJsambara, Stuhlmann [Tropenpflanzer, 4 {1900), Xo.ll, 

 pp. 561, 563). — A brief note is given on a disease of sorghum in Africa. The cause 

 is not definitely known, and some varieties seem more subject to it than others. 



Fungus diseases of the sugar beet {Beet Siujar Gaz.,2 {1900), No. 9, pip- 5-8, 

 fif/s.S). — Notes are given on root rot due to Rhizoctonia and on the leaf spot dis- 

 ease caused l)y Cercospxira hetiroJa. 



The practical workings of seed treatment for prevention of diseases of 

 sugar beets, B. Frank {Bl. Zuckerruhenbau, 6 {1899), No. 5, pp. 65-68). 



Notes on some fungus parasites of fruit trees, L. De Nobele {Bui. Arbor, 

 et Flor., 1900, 2}p. 147-150). 



Combating Fusicladium on fruit trees {Deut. Landw. Pr esse, 37 {1900), No. 91, 

 pp. 1106, 1107, Jigs. 3). — The value of Bordeaux mixture as a means for the pre- 

 \-ention of scab of apples and pears is shown. Three applications^are recommended 

 and the leaves in the autumn should be collected and l)urned. 



Fungus pests of citrus trees {Agr. Jour. Cape Good Hope, 17 {1900), No. 7, p>p>. 

 431-434)- — Brief popular descriptions are given of a number of principal fungus pests 

 on citrus trees, which have been observed in Australia. The diseases described are 

 false melanose, withered tip, anthracnose, sooty mold, black scurf, scab, bark Idotch, 

 collar rot, and root rot. Suggestions are given for the prevention of these different 

 diseases, and among the fungicides recommended are Bordeaux mixture, a dilute 

 solution of copper sulphate, ammoniacal copper carbonate, carbolic acid, sulphur, etc. 



Some fungi of the cacao tree, J. H. Hart ( West Indian Bui., 1 {1900), No. 4,PP- 

 433-437, j)l. 1) . — Notes are given of attacks of Phytopthora omnivora, Nectria bainii, 

 and an undescribed species of Nectria, all of which proved considerably injurious to 

 the production of pods of cacao. The Phytopthora is said to diminish the weight of 

 the pods fully 25 per cent. The beans are reduced at the same time and there is 

 quite a depreciation in their quality. 



Concerning the bacterial diseases of strawberries, P. Yoglino {Attn. Accad, 

 Agr. Torino, 43 {1899). 



Fungus diseases of the grape {Oklahoma Sta. Rpt. 1900, pp. 104-107 , figs. 3). — 

 Brief descriptions are given of anthracnose, black rot, brown rot or downy mildew, 

 and shelling or rattles of grapes, with suggestions for their prevention. 



Rust, leaf spot, and anthracnose of grapes, L. Baldrati {Italia Agr., 1900, 

 No. 6, pp. 4)- 



Observations on grape anthracnose, J. Capi's {Observations sur V anthracnose 

 maculee. Bord/'mi.r, 1900, pp. 15). 



Variations in the maturing of Plow^rightia morbosa spores, W. A. Riley 

 {Bnl. Torreg Bot. Club, 37 {1900), No. 5, pp. 386, 3S7).—\\\\\\b studying the black 

 knot fungus considerable variation was noticed in the time of maturing the asco- 

 si:)ores. January has been given as the time for their maturation in INIassachusetts, 

 but in New York the first appearance was noted on March 7, and only by the mid- 

 dle of April were they fairly abundant. Examinations made as late as May 9 showed 

 75 per cent of the spores immature. 



Practical directions for combating Peronospora, A. Bizzozero {Istruzioni 

 pracliche j>er combattere la peronosiiora e la crittogama. Parma, 1900, j^P- 39) . 



On the use of copper sulphate as a remedy for Peronospora, L. Sostegxi 

 {Extr. Giorn. Viiicol. e Enologia, 7 {1899), jjp. 15) . 



The occurrence of the California vine disease in Avellino, C. Gasali and T. 

 Ferraris {E.rtr. Giorn. Viticol. c Enologia, 8 {1900), pjp. 10, pis. 3). 



Liver of sulphur for combating oidium, G. Battanchon ( Vigjie Amer. et Viti- 

 cult. Europe, 34 {1900), No. 7, pp. 190-301).— K formula of potassium sulphid 500 

 gm., black soap 500 gm., and water 100 liters is given. The etficiency of the liver of 

 sulphur is said to be increased by adding the soap. 



