8 



BULLETIlSr 815, U. S. DEPAIlTME3SrT OF AGRICULTURE. 



The importance of the Open stram hes in its tendency to fruit- 

 fidness during all seasons of the year under normal conditions. In 

 this respect it is more desirable than the Lisbon strain. The trees 

 have not been as productive as those of the Lisbon strain and have not 

 shown as great resistance to unfavorable climatic conditions, such 

 as low temperature or extreme heat, as the trees of the Lisbon strain. 



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1 





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Fig, 2.— a typical Ipmon tree (25 years old) of the Open strain of the Lisbon variety, No. 1-34-11 in the 

 performance-record plat, showing the open habit of growth characteristic of the trees of this strain. The 

 summarized record. of this tree is presented in rank 64 in Table I. 



Therefore, it seems probable that the Open strain is better adapted 

 to those sections where the climatic conditions are most moderate, 

 as is the case in lemon districts near the coast. The Lisbon strain is 

 probably best adapted to interior districts where extremes of heat 

 and cold are more likely to occur. 



DENSE-UNPRODUCTIVE STRAIN. 



The trees of the Dense-Unproductive strain show very vigorous 

 vegetative growth. They bear large, pointed leaves and coarse fruits- 

 having thick rinds and a comparatively small quantity of juice. 

 The proportion of trees of this strain in different Lisbon groves 

 varies greatly. In some unproductive orchards most of the trees 

 belong to this strain. The desirability of eliminating this strain in 

 estabhshed orchards or in new propagations is emphasized not only 

 from the standpoint of low production, but equally, if not more im- 

 portant, on account of the production of coarse, inferior fruits, 

 which are likely to be very injurious to the reputation of California 

 lemons. 



