364 



strains of this Crown Rot fungus — secured from various parts of the 

 (ountry — on culture media in an effort to classify them. Cultures were 

 made on a large numher of media, including nutrient agar, potato agar, 

 l>ean plugs, jidtato ])lugs, ginseng plugs, sweet potatoes, turnips, nutrient 

 gelatin, corn-meal. Kaulins' culture fluid, and several others. On all the 

 media mentioned the various strains made a good growth, the optimum 

 being at the temi)erature of .!(>' ('. On several of the media the growths 

 of a number of the strains were uidike, so there may be more than one 

 species, but as the fruiting stages were not obtained, this could not be 

 determined definitely. 



The ("I'own Kot is apparently disseminated in two ways; by the myce- 

 iium and by spores. The mycelium nia.v grow tlirongh the soil to other 

 roots or it may I'l- distrii)ute(l by im]»lements used in spading or weeding 

 the beds. The sp(»res may be scatteied b.v the wind and I'ain or Ihey may 

 may be carried on diseased seedlings or on tlu' shoes and clothes of peo- 

 ple visiting the various gardens. As stated before, this fungus grows on 

 a luunber of plants other than ginseng and it may also gain entrance to 

 the ginseng garden directly from these other plants liy any of the agencies 

 given abo\e. 



"i'he growth of this fungus does not seem to be affected by any change 

 in the .acidity or all<;ilinity of the soil whicli could be brought about in 

 tlie field. I'ntil some better means of coniliating it is foinid. the old 

 lotted roots should be carefully dug and burned so as to remove the 

 ('anger of infection from the cup stage in tlu' sjjrin.g. The attacked stems 

 should also !)(' removed ;nid burned as soon as noticed. Spraying with 

 l.ordean.x mi.xture will pi-ob.-ibly lessen the in.iury to the stems above 

 gi'ound. In a<ldition in this the garden sliould be well-drained, and if the 

 disease becomes \-ei'y prevalent, it would be well t<i remove ji.nrt of the 

 over-h(>ad covering and loosen tlie sill ;ironnd the ]il;infs so as to allow 

 them to dry out. 

 WalKish College, 

 Croirfordfin'lle. Iml., Jiiik /7. IDIJ. 



