J.6G 



Chi -square analyses: Chi -square 

 comparisons of variance arrangements 

 were used to show the within -tree den- 

 sity trends for d.b.h. categories and 

 plots. These analyses supplemented 

 the variance analysis of variance as a 

 tool in making decisions about proper 

 sampling procedures. Only data for 

 the 1/2 sq. ft. samples were used in 

 the analyses . 



Regression analysis: Regression 

 and variance analyses were used to 

 check the relation of each of the follow- 

 ing variables to d.b.h.: height of in- 

 festation, attack density, and gallery 

 length. 



20 40 60 80 100 120 140 



2 



Mean Brood Count Per Ft. 



Figure 6. --Teton plot- -brood density: x 

 for 1/10 sq. ft. rectangular samples, 

 o for 1/2 sq. ft. samples. 



225 



200 - 



175 

 150 . 



5 To l5 20 



Mean Brood Count Per Ft 



7! W 



2 



Figure 7. --Wasatch plot- -brood density: 

 X for 1/10 sq. ft. rectangular samples, 

 o for 1/2 sq. ft. samples. 



5 



