;]59 



of the ginseng gardens in New York. This perfect stage developed from 

 sclerotia on roots which liad lain in the garden during the winter, very 

 near the surface of the ground. In the spring short stalks were sent up, 

 bearing large cup-shaped apothecia containing the asci with their asco- 

 spores. These spores when mature are shot up into the air to be dissem- 

 inated by the wind and rain. 



Fig. 3. Black Rot. Cross and longisections of root and bud of diseased and healthy plants. 

 The blackening of the diseased roots will later extend to the center of the diseased root. Section of 

 health}- plant on right. (,A.fter H. H. Whetzel.) 



When once established in the garden the parasite apparently spreads 

 by the mycelium growing through the soil from one plant to another, kill- 

 ing all that come in its path. It is also spread by the tools used in weed- 

 ing or si)ading the beds, especially in the fall. Its distribution from one 

 garden to another is probably brought about by infested soil or perhaps 

 by spores being carried on the shoes of people visiting the various gardens, 

 or by the importation of diseased roots. 



A number of experiments were performed to determine if possible 

 gonje raethod of eradicating this disease b^ soil treatment. It w^s foun^ 



