LUTHER BURBANK 



merit surpassing all the rest, is the power of re- 

 sistance of the Burbank rose which the Santa 

 Rosa shares to those ever-present foes of the rose 

 family, mildew and rust. 



The new roses appear to be absolutely immune 

 to the attacks not alone of these, but of other 

 fungoid enemies. 



Their healthiness under all climatic conditions 

 is their final and definitive quality. 



MAKING PLANTS IMMUNE TO DISEASE 



This quality of immunity to disease, while pri- 

 marily due, no doubt, to the enhanced vitality 

 given the flowers through hybridization, has been 

 accentuated and developed by persistent selection. 



In this regard, the roses do not differ from prac- 

 tically all other plants with which I operate. I 

 have referred more than once to my method of 

 developing immune races of plants, and empha- 

 size it once more with propriety in the present 

 connection, because, as is well known, the rose is 

 peculiarly susceptible to the attacks of many fun- 

 goid and insect enemies. 



Indeed, many a rose that would otherwise have 

 value is so susceptible to the attacks of disease that 

 it not only gives no pleasure to its owner, but 

 becomes a source of infection in the garden that 

 makes its presence a menace to other flowers. 



To give plants immunity to the chief diseases 



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