66 MASSACHUSETTS HORTICULTURAL SOCIETY. 



reinfects the plant each season from spores ^Yhich winter over. In 

 the case of two plants seemingly growing under the same conditions, 

 where one annually becomes infected and the other does not, we 

 may say that one may be much more resistant to the rust than the 

 other. It is not a matter of treating the roots. Thorough culti- 

 vation and the destruction of stubble and old tops are advantageous. 

 Keep the cultivator going all the time, for in this case good cultiva- 

 tion and vigorous plants are most important. 



