APPENDIX B 



the trouble by frequently dividing and trans- 

 planting the roots. Where nematodes are the 

 cause of the swellings, diseased roots should never 

 be planted on land along with the healthy or on 

 which it is expected to grow peonies continuously. 

 Land on which galled plants have been grown 

 should not be used again for peonies for three 

 or four years. The worms will usually die out, 

 especially here in the North, for want of a suit- 

 able host in which to survive. 

 Root Rots. 



Rotting roots of normal size and shape have 

 several times been sent to me by growers. What 

 appears to have been a similar root rot has been 

 reported by the botanists of the Connecticut and 

 Massachusetts Experiment Stations. Some 

 growers have reported it as veiy destructive. 



Symptoms. — The rotting away of the crown 

 and the larger roots seems to be a rather constant 

 symptom. The top of the plants either fails to 

 appear in the Spring or wilts and dies dm*ing the 

 Summer. 



Cause. — The cause of root rot is apparently 

 unknown. Nothing more than a casual examina- 

 tion appears to have been made by those plant 



16 241 



