DISEASES OF GINSENG. 5T 



at once and drying them. Sterilization of soil with steam or for- 

 malin before reusing. 



B. Leaves becoming colored with shades of red and yellow, 

 finally dropping off. Never wilting suddenly. Root rotton, soft 

 and watery- odor strong and disagreeable. * * * SOFT EOT. 

 Treatment: Better di-ainage and ventilation. (Soil too soggy.) 

 Tile drainage or raising beds up higher. Mixing sand into soil. 



C. Leaves becoming colored as in B, but root not watery. 

 Mealy when crushed between fingers. Usually affecting the crown 

 of the root and the base of the stem. Covered with an abundance of 

 white mold and many hard black kernels or sclerotia, about one- 

 fourth of an inch across. * * * RHIZOCTONIA ROOT ROT. 

 Treatment: Thorough ventilation of garden and drainage of soil. 



D. Roots fail to send up stock in spring. Roots of a tar 

 black color at fii'st. Firm, no disagreeable odor, taste like quinine, 

 finally Ijecoming soft and rotten. * * * BLACK ROT. Treat- 

 ment: Careful removing of roots and burning them. Removing 

 dirt in affected area to the depth of eighteen inches and replacing 

 with fresh soil. 



E. Tops apparently healthy. Rootlets covered with galls 

 or swellings. * - * NEMATODE ROOT GALL. This disea- 

 se is caused by minute worms, and not by fungi or Ijacteria. No 

 cure for affected root. Thorough freezing or drying of soil will 

 kill the worms. Safest method is to remove garden to another 

 place, if it be possible and to start with seed or unaffected roots. 



//. Diseases affecting leaves, stem, and seed balls. Treat- 

 ment: Spraying with Boi'deaux Mixtui-e. 



1. Affecting seedlings. 



A. Leaflets and top of the stem suddenly become wilted 

 and then dry and papery- not becoming bronzed or reddish. * * * 

 TOP BLIGHT OF SEEDLINGS. Due to Alternaria. Treat- 



