64 Bulletin 186. 



Frank* lias recently reported R. violacea as destructive to grape 

 vines. A perfect form is reported which he names Thele^honi 

 Rliizoctoniod. 



Rostrup has also described lihizoctonia fusca, the cause of a dis- 

 ease of turnips in Sweden. Conies, Sorauer and Frank have also 

 given full general accounts of the European rhizoctonial diseases in 

 their works on plant diseases. 



The list of European host plants now covers a very wide range. 

 The following are the most important plants affected : Alfalfa, 

 asparagus, beet, carrot, various clovers, crocus, fennel, geranium, 

 oak, onion, pine, potato and turnip. In all of the above the fungus 

 is primarily a root parasite, and it will be seen that it occurs upon 

 fleshy, herbaceous and woody roots. 



Rhizoctonia in Amekica. Historical. 



Neglecting for the present any such mentions of Rhizoctonia as 

 have been made in "Lists of Fungi," or even brief teclmical descrip- 

 tions of new forms, we find in American literature very little con- 

 cerning Rhizocto7iia. In 1891 Pammelf published some notes on 

 beet diseases, and a beet root-rot was described which he considered 

 due to Rhizoctoiiia hetce Kiilin,:}: this fungus having been mentioned 

 by Kiihn, Eidam and others as an important beet disease in Germany. 



In 1892 Atkinson§ found in Alabama a sterile fungus causing a 

 damping-off of cotton, also called " sore shin." Later he found and 

 described a similar fungus in connection with the damping-oif of 

 various seedlings under glass at Ithaca. || 



The above are the chief economic references to the occurrence 

 of lihizoctonia in America until the appearance of Bulletin 163 T[ 



* Frank B. — Ein nener Rebenschadiger in Rheinhesseu [Ref. Centrbl. f. Bakt. 

 Parasitenk. u. lufektiouskr., 4, 781, Abtli. II.] 



f Pammel, L. H.— Bulletin 15. Iowa Agl. Exp. Sta., 1891. 



X Klilin, J. — 1. c. 



§ Atkinson, Geo. F. — Some Diseases of Cotton. Bulletin 41, Ala. Agl. Exp. 

 Sta., 1892, pp. 30-39. 



II Atkinson, Geo. F. — Damping off. Bulletin 94, Cornell Univ. Agl. Exp. Sta., 

 1895, pp. 339-342. 



IF Duggar, B. M. — Three Important Fungous Diseases of the Sugar Beet. (See 

 pp. 339-352.) 



