Table 2 — Matrix of simple correlation coefficients among mean values for 83 populations. 



Absolute values greater than 0.21 or 0.26 are statistically significant at the 5 and 1 

 percent levels of probability, respectively 



Variable 



Codes 



HT7 



AH1 AH2 



AH3 



LG 



NC 



M 



SB 



Fl 



SD 



3-year height 



HT3 



0.94 



0.82 -0.40 



0.14 



0.88 



-0.84 



-0.29 



0.36 



-0.43 



0.74 



7-year height 



HT7 





.89 - .26 



.29 



.94 



-.85 



-.26 



.44 



-.41 



.72 



Adjusted height 























PREF 640 



AH1 





-.19 



.29 



.92 



-.93 



-.26 



.41 



-.43 



.78 



PREF 1,500 



AH2 







+ .00 



-.13 



.31 



.24 



.02 



.13 



-.33 



Lost Valley 



AH3 









.25 



- .17 



.04 



.14 



-.06 



.16 



Late growth 



LG 











-.86 



-.20 



.45 



- .41 



.68 



Needle cast 



NC 













.29 



-.41 



.39 



-.76 



Mites 



M 















.09 



.14 



-.30 



Shoot borer 



SB 

















- .12 



.23 



Frost injury 



Fl 



















-.34 



Snow damage SD 



Table 3 — Correlation of 30 population means from field tests with laboratory tests of 



freezing injury (Rehfeldt 1980) and greenhouse evaluations of the periodicity of 

 shoot elongation (Rehfeldt and Wykoff 1981). Coefficients of absolute value 

 greater than 0.35 and 0.45 are statistically significant at the 5 and 1 percent 

 levels, respectively 



. Shoot elongation 



Variable 



1 



injury 



Amount 



Initiation 



Rate 



Duration 



Cessation 



3-year height 



0.82 



0.81 



-0.19 



0.67 



0.79 



0.79 



7-year height 



.81 



.80 



-.22 



.63 



.82 



.81 



Adjusted height 















PREF 640 



.75 



.62 



-.22 



.40 



.81 



.80 



PREF 1,500 



.32 



-.19 



-.30 



-.25 



-.22 



-.27 



Lost Valley 



.09 



.17 



.25 



.16 



.14 



.18 



Late growth 



.85 



.80 



-.26 



.61 



.81 



.80 



Needle cast 



-.77 



-.59 



.18 



-.42 



-.76 



-.76 



Mites 



. -.01 



- .14 



.29 



-.03 



- .11 



-.06 



Shoot borer 



-.43 



.19 



-.20 



.06 



.42 



.41 



Spring frost injury 



.27 



-.55 



.30 



-.48 



-.53 



-.50 



Snow damage 



.52 



.59 



- .17 



.47 



.69 



.69 



Table 4 — Results of stepwise multiple regression analyses 



presented as standard errors (s) and coefficients of 

 determination {R^) 



Independent 



Dependent variable 



variables 





s 





Number 







7-year height 



10 



0.89** 



0.0654 



Adjusted height 









PREF 640 



13 



.86** 



.0350 



PREF 1,500 



15 



.50** 



.0197 



Lost Valley 



16 



.45** 



.0273 



Late growth 



13 



.91** 



.1878 



Needle cast 



13 



.88** 



.1113 



Mites 



20 



.41** 



.0536 



Shoot borers 



13 



.41** 



.0258 



Spring frost injury 



15 



.40** 



.0203 



Snow damage 



18 



.80** 



.0740 



•'Statistical significance at the 1 percent level. 



5 



