442 



The Journal of Heredity 



,1^*2. 



CALIFORNIA NAVEL ORANGE TREE 



The culture of the crop in southern CaHfornia is in most respects very markedly different from 

 that in Brazil. The trees usually ^t^t better care, more fertilizer and abundant irrigation, 

 and therefore are likely to produce a larger yield than those in Brazil. (Fig. 4.) 



of the trees have been pro]:)a^ated from 

 the more vij^orous ^rowinj^, and as a 

 matter of faet, least desirable tyiJe of 

 trees for fruit ]jr(jducti(jn, both as 

 rej^ards quantity and commercial quality 

 of the crop. In other words, there has 

 been a steady deterioration in the 

 characteristics of i)r()duction of the 

 variety from the ])r(;paji;ation of these 

 inferior and undesirable fruitinj^ types. 



Performance records of typical trees 

 of the eleven common types of the 

 Washington na\-el orange imder com- 

 ])arative conditions for six years have 

 established fairly well the behavior 

 and the value of I lie trees of these 

 types. The undesirable types, without 

 exception, have been successfully top- 

 worked, usin}^ budwood from select 

 trees of the JDCst types. The select 



