86 DISEASES OF GINSENG. 



tions favorable to soft rot, bad conditions surrounding the plant, 

 hastened by the age of the roots- 



As this disease is found only on poorly drained and wet, 

 soggy soils, the remedy is to improve the conditions of the beds. 

 Tile drains set fairly close together are advised. It would be bet- 

 ter still to grow ginseng in soils more naturally adapted to the 

 crop (light, sandy and well drained). The soil if heavy and soggy 

 may be made lighter by stirring up and mixing sand with it. 



End or Red Rot. 

 (bacillus araliavorous uyeda.) 



This disease of ginseng is found causing much damage in 

 Korea. In an extensive paper written by Y. Uyeda, a Japanese 

 investigator of ginseng diseases, we find this disease described- 

 He thinks it is the same as our soft rot disease. After several 

 years of work, making inoculations and studying the organisms, 

 he attributes the end rot to be a bacterium, which he has named 

 Bacillus araliavorous. He also finds two other bacteria commonly 

 associated with and aiding to rot the root. These he has called 

 Pseudomonas araliae and Bacillus Koraiensis. 



He says the end rot has different symptoms, but that ac- 

 cording to his observations usually the affected roots are a black 

 or gray and become somewhat soft. The ginseng roots which are 

 reddish gray become somewhat soft, but the gray black roots rot 

 and decay more rapidly. He found that where ginseng is grown 

 on a wet soil or in a moist climate and soil are very dry after the 

 appearance of the decay, the rotting is very slow. He finds it to be 

 a wet soil disease and recommends the following: 



1. Disinfect the soil where it has occurred with a 1 per cent, 

 formalin solution, using 200 to 300 pounds per acre- 

 Two weeks after this application the plantation will be ready 

 for sowing seeds or planting. 



