Diseases of the Sugar Beet. 361 



grayish, mould-like growth of the fungus may appear on the sur- 

 face ; and it was by inoculations with pure cultures of this 

 fungus that he was able to reproduce the disease on healthy 

 tubers. The following year Professor Bolley found the scab of 

 beets abundantly, and the microscopic evidence which he obtained 

 indicated that the fungus w^as the same in both cases. He 

 furthermore ascertained that in all cases when the beet scab was 

 abundant, potatoes had been grown on the soil, either the pre- 

 vious year or somewhat earlier. Working independently, at 

 about the same time. Professor Arthur came to similar con- 

 clusions about the identity of these two forms of scab ; and a 

 single decisive experiment in the transfer of scab from potato to 

 beet was reported by him. Since that time there has been 

 abundant general evidence to establish the fact that scabby beets 

 may be expected if the seed are sown on land which has recently 

 produced scabby potatoes. On the College Farm during the past 

 season it has been very significant that the land producing scabby 

 potatoes the previous season, produced scabby beets last season, 

 while infected soil produced beets free from the disease. 



The remedy cannot consist in this instance in the treatment 

 of the seed, since the seed do not disseminate the disease ; nor 

 can it consist in the treatment of the land, since the experiments 

 with liming, sulfuring, etc. have not given satisfactory results. 

 The only course open, then, is the one of avoiding for the growth 

 of beets any soil, which, during several j^ears previous, has pro- 

 duced scabby beets. B. M. DUGGAR. 



IV. Some References to the Literature of Beet 



Diseases. 



Arthur, J. C, and Golden, Katharine E.— Diseases of the Sugar Beet Root. 

 Bulletin 39, Indiana Agl. Exp. Station, pp. 54-62. 



Bolley, H. L. — A Disease of Beets Identical with Deep Scab of Potatoes. 

 Bulletin 4, North Dakota Agl. Exp. Station, pp. 15-17. 



Buckhout, W. A.— (Report Penn. Agl. Exp. Sta., 1893, pp. 152-153)- 



Busse, W. — Bacteriologische Studien iiber die Gummosis der Zuckerriiben. 

 Zeitschr, fiir Pflanzenkrankheiten, VII, 1897, 65-77 and 149-155- 



Bidam, E. — Untersuchungen zweier Krankheitserscheinungen, die an den 

 Wurzeln der Zuckerriibe in Schlesien seit letztem Sommer ziemlich 

 haufig vorgekommen sind. Jahresb. der Schlesischen Ges. fiir vater- 

 landische Cultur, 1887, pp. 261-262. [Ref. Bot. Centrb. 35, 1888, p. 303]. 



