APPENDIX B 



Diseases of the Root 

 The Root Gall. 



The root gall disease appears to be rather 

 widely distributed in eastern United States and 

 is well known to the growers who make a specialty 

 of this plant. Specimens have come to my hands 

 from time to time during the last eight years. No 

 special investigations on this disease appear to 

 have been made, and aside from a short article in 

 the Florists' Exchange of April 19, 1909, it ap- 

 pears to have been rarely written about. Whether 

 it was first imported from Europe or is of Ameri- 

 can origin is not known. Certain imported 

 French varieties are often very severely affected. 

 It is regarded by peony specialists as a trouble- 

 some and by some as a dangerous malady. 



Symptoms. — The above-ground symptoms 

 are many weak, spindling shoots which remain 

 short and give no blooms. The shoots often 

 grow fewer and shorter from season to season, 

 the plants gradually dying out. In other cases 

 the plants appear to gradually recover, the shoots 

 growing stronger from year to year and finally 

 blooming. The latter appears to be the cas© 



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