Hoff, R. J., and G. I. McDonald. 



1980. Improving rust-resistant strains of inland western 



white pine. USDA For. Serv. Res. Pap. INT- 245, 13 p. 



Intermt. For. and Range Exp. Stn. , Ogden, Utah. 84401. 



Describes a nursery test designed to produce western 

 white pine possessing a variety of mechanisms of rust-resistance, 

 broad adaptability, and increased growth rate. Mechanisms of 

 resistance (low needle spot frequency, slow canker appears, 

 slow canker growth or tolerance) and growth rate will be 

 selected on a family basis. Individuals exhibiting needle 

 spot prevention, low needle spot frequency, premature needle 

 shed, short shoot reaction, bark reactions, and accelerated 

 growth will be selected from within these families and used to 

 establish seed orchards. Also discusses recommendations to 

 separate the inland region into hazard zones, and the management 

 of natural stands to develop resistance. 



KEYWORDS: Cronartium ribicola, resistance natural selection, 

 resistance mechanisms 



Hoff, R. J., and G. I. McDonald. 



1980. Improving rust-resistant strains of inland western 



white pine. USDA For. Serv. Res. Pap. INT- 245, 13 p. 



Intermt. For. and Range Exp. Stn., Ogden, Utah. 84401. 



Describes a nursery test designed to produce western 

 white pine possessing a variety of mechanisms of rust-resistance, 

 broad adaptability, and increased growth rate. Mechanisms of 

 resistance (low needle spot frequency, slow canker appears, 

 slow canker growth or tolerance) and growth rate will be 

 selected on a family basis. Individuals exhibiting needle 

 spot prevention, low needle spot frequency, premature needle 

 shed, short shoot reaction, bark reactions, and accelerated 

 growth will be selected from within these families and used to 

 establish seed orchards. Also discusses recommendations to 

 separate the inland region into hazard zones , and the management 

 of natural stands to develop resistance. 



KEYWORDS: Cronartium ribicola , resistance natural selection, 

 resistance mechanisms 



