116 115 114 113 112 



Figure 2— Predicted levels of infection (percentage) by Lopho- 

 dermium baculiferum for populations of ponderosa pine derived 

 from regression coefficients listed in table 4 at a constant eleva- 

 tion (mean of all stands, 3,282). 



Elevation had no effect, as shown in figure 3. The 

 plotted values are the actual percentages of infection 

 plotted against elevation. The line (A) represents the 

 predicted infection level at the southern geographic point 

 using 44 percent for the collection area. The line was 

 derived by using the regression coefficients for the eleva- 

 tion factors listed in table 4. 



Progeny Test 



The level of infection varied from none (1 percent of the 

 trees) to nearly complete defoliation of 1983 needles (28.1 

 percent of the trees). The levels of infection are summar- 

 ized in table 2. 



Analysis of variance of the levels of infection shows that 

 the differences among stands and families within stands 

 were highly significant (table 5). Table 6 lists variance 

 components. Heritability based on individuals was 0.45; for 

 families, 0.60. 



There was little relationship between the degree of in- 

 fection and the heights of the trees in 1985 (fig. 4). The 

 R 2 for populations was 0.02 and for families, 0.07. 





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1000 2000 3000 4000 5000 6000 FT 



(305) (610) (915) (1920) (1524) (1829KM) 



ELEVATION 



Figure 3-Actual levels of infection by 

 Lophodermium baculiferum for populations of 

 ponderosa pine plotted against elevation. The 

 line (A) represents the predicted elevation effect 

 (derived from the multiple regression equation) 

 for a constant geographic effect, in this case 44 

 percent infection. 



4 



