306 K. STERN 



be of utmost importance for designing a resistance breeding program if 

 they are seen in the general framework of an ecological-genetical study. 



There are also some attempts to introduce into resistance breeding 

 new models from biomathematics like the one of Okabe and Hashigichi (1968) 

 These authors use the theory of games to find the best mixtures of geno- 

 types with respect to resistance. The present author would not propose 

 their particular approach to breeding white pines for blister rust. But 

 it is a good example of the new approaches attempted by research workers 

 all over the world who try to make the outcome of resistance breeding 

 more predictable. 



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