I'oTATi-M AJ:. 537 



Potato-Scab. 



Tin- >yniptums of tliis I'Dium, .a disease consist in the formation 

 of areas of dry corky tissue on tin- surface ,.f tin- tuber-. 

 These soon fall a prey to hacteiial form-, ainl nutin- takes 

 place, BOOD, however, to be nit <>ti' from the healthy ti<-iie by 

 a layer of cork. Tin- disease continues to .-pn-ad , 1, ,]., -r Into the 

 tuber, till the reserve material- are used up or ivinleiv,! use! 

 r>, illey ' ascribes the disease to a particular Bacterium which he 

 isulated and used to carrv out infect i, ,n- ,.n healthv tulT-. 



i i. 



Without doubt this AV/7/r////// i- common in tubers exhibiting 

 "scab," bin i.tln-r cunditioiis may have caused the disease in the 

 tirst instance. 



Thaxter'-' believes that the scab-disease of both potato and 

 beetrool is <-au.-ed by a fun-n- Oospora .-<r//////x (p. 4!7). 



Schilbers/.ky :; in invest i-'atin^ a jiotato-seab, found a fun-u- 

 which he places nni"nv,st the Chytridiaceae ; its life-hi-t^ry has 



Hut as yet been followed out. 



Bacterial Diseases of Beetroot. 



I'.i-etrutpt and sugar beet have -hwn themsel\-e- very liable 

 tu di-ea>c- which have been ascribed t" bacti-rial agency. Thus 

 in su^ar beet which yielded a l,>w proportion uf sugar, Arthur ami 

 Golden 4 fuund the cells inhabited liv a multitude of bacteria. 







The-e inhabited buth roots and leaves, withmii, however, giving 

 any e\:emal evidence ,.f their presence. 



Hilt m-r ' uliser\ed that beetrout died in consequence "f h^s 



uf its rout-hairs. Tlii- lo>s wa> traceil to bacteria, and. after 

 ! he-e had been killed by d i -ii i tec t ii>n , the >aine rOOtfi a-aiu 

 j.rudiiced normal mot -hairs and grew \\ell. 



More rcci.'iitly Sur-uier" de.scrili r > a di-ea-e uf these CTOpa 

 in (ierniany. The lo\\cr end- of the plants become black, uhile 



I'lulii the Ulldi>ea-ed portions of the -UlTace [||elc c\lldcd 'a 



-uiiiiiiv tluid ciintainiii'^ liai'teiia. yeasts, and fiin-i. Ib ieis 



l'...!|i-\. "Pol 3 il-. Agricultural Science, I V.HI. 

 -Tli.i\t-i. Reports of th^ Connecticut Agric. I - ^'"' ..! l^'.'i. 



-lull" i s/k_s . \""i l.iul. M iHli.'iliin-, /! ,.'/.-/ if 



' 1 1; -. i- - IP! tli.- Sugar Beetrool / i ~- ' 



Hiltin-1', \./. //-/-/(. I'ui'l n-irili, /.,',i n 



/,''/"./ i. /.n.-l;< ,-,-nl,, itl.iiu, Is'.M ; :il-.. /' 



. \ III I "'.l.'i. |P 2 



