DISEASES OF PLANTS. 737 



kohl rabi and to it the name Phonia napohrassicce has been given. The 

 other, which has been described by the author as P. sphcerosperma, 

 attacks beet roots. As this name had been preoccupied, the name now 

 given it is Fhoma betce. It is thought by the author that this Phoma is 

 genetically related to Sporidesmium putrefaciens. 



Rust in -wheat {Proc. Bust in Wheat Con/., Brisbane, Queensland^ 

 1894, March, pp. 77). — Progress reports were given by various commit- 

 tees, and the consensus of opinion seems to be that more attention 

 should be paid to the harder wheats, especially those having narrow 

 leaf blades and which are to a considerable degree glaucous, as the 

 most promising rust resistant varieties. Lists are given of what are 

 considered the more resistant varieties, but they vary in different parts 

 of the country represented. Numerous experiments were reported of 

 the ineffectual use of fungicides on the seed before sown. The report 

 concludes with illustrated descriptions of 45 of the more prominent 

 varieties of wheat. 



Treatment for sooty mold of the orange, H. J. Webber {JJ. 8. 

 Dept. Agr., Division of Vegetable Pathology Circular 15, pp. 4). — The sooty 

 mold of the orange, considered by the author as probably due to Meliola 

 spp., produces a very marked effect on the tree and fruit. The leaves 

 and fruit are covered by a black soot-like membrane which greatly 

 hinders the processes of assimilation, and the fruit when ripe is small, 

 insipid, and of a very inferior character. In severe cases the trees fail 

 to produce any fruit. 



Experiments show that resin washes are very effective remedies in 

 preventing this disease. The formula recommended is resin 20 lbs., 

 caustic soda 4^ lbs., crude fish oil 3 pt., water to make 15 gal. Place the 

 materials in a large kettle with 13 gal. of water and boil until the resin 

 is dissolved, then add water to make 15 gal. This is a stock solution. 

 When used it must be diluted to 150 gal., and will cost about 45 cts. for 

 such an amount. When too strong the wash wiU burn the fruit, but in 

 the strength here given no injury will follow. The author states that 

 the disease is only serious in its attack when accompanying the white 

 fly or mealy wing, Aleyrodes citri. In badly affected groves 3 periods 

 of application must be observed. Beginning the middle of January, 3 

 applications should be given at intervals of 2 weeks. In May and June 

 is a second period when the trees should be sprayed, and the third 

 period is in August and September. The spray is easily washed off" by 

 rain and should be repeated when a rainfall occurs soon after spraying. 

 Thoroughness of application is required, a 14-year-old tree requiring 15 

 to 20 gal. for each application. 



Treatment for potato rot, A. Sempolowski (Ztschr. Pfianzenkranh., 



[1894), No. 6, pp. 323-325). — The author conducted experiments on 10 



plats of about -^ acre each for the prevention of potato rot. Plats 1, 4, 



7, and 10 were untreated, No. 2 was sprayed with a Bordeaux mixture 



14467— No. 8 5 



