DISEASES OF GINSENG. 89 



When there are present on a single root hundreds of galls 

 and these filled with the worms (Fig. 39), there must be some 

 loss of nourishment which should go to the plant. But by far the 

 greatest injury is brought about by the abnormal growth of the 

 galls. The tissue is stimulated to excessive growth at the expense 

 of the remainder of the plant. The part of the root below the 

 gall frequently attains an abnormal size. In these galls the ves- 

 sels become very irregular and often entirely disconnected. When 

 the gall decays, this portion of the root is also destroyed. Before 

 the roots are placed in the market, the galls and fibers must be 

 stripped, so that the loss is great. 



It is the opinion of the owner of this affected garden that 

 nematodes do not injure the growth of the stalk or lessen the 

 amount of seed. The growth of foliage this year was fine and the 

 badly effected bed of 602 plants produced 18,000 good seed. Such 

 plants might be kept for seed purposes, but in no case should 

 roots be sold except in the dry market. 



It is probable that these worms were introduced into the 

 garden from the forest. The owner of this garden has found them 

 on forest roots in Seneca County, and at Trumbull's Corners, near 

 Enfield, Tompkins County. They might have been carried in in- 

 fested manure or from some greenhouse. 



Treatment: — The killing of nematodes in affected roots 

 would be an impossibility, as any method employed would also 

 kill the root. The removal of the garden to a different location is 

 certainly to be advised, if it be possible; to start with seed or un- 

 affected roots, taking great care not to transfer any of the worms 

 to the new garden. (The seed if simply taken from the plant will 

 not carry the worms. In case they are picked from the ground 

 they should be dried as much as is safe, to insure not transferring 



