MINNESOTA RUST RESISTANCE BREEDING PROJECT 613 



Open -pollinated seed produced by the selected trees of this Fi genera- 

 tion may then be used commercially. Bingham and his associates (Bingham, 

 Squillace and Wright, 1960) working with western white pine realized rust 

 resistance genetic gains of up to 30 to 40 percent from similar crosses; 

 such gains may reasonably be expected in this program. Additional gains 

 in the F 2 and subsequent generations in terms of rust resistance and other 

 traits may be anticipated until the genetic variation in the population 

 is exhausted. 



The first replicated progeny test (Fj) will be outplanted in about 

 20 years (ca. 1988). This will require an area of about 10 acres, iso- 

 lated from the Tofte screen test site but in an equally high infection 

 area. 



LITERATURE CITED 



>ingham, R. T., A. E. Squillace, and J. K. Wright. 1960. Breeding blister 

 rust resistant western white pine. II. Silvae Genet. 9: 55-41. 



FLOOR DISCUSSION 



Neither of the authors could be present to present this paper; it was 

 offered only in abstract form and there was no discussion. 





