Table 1 — Frequency of gouty pitch midge damage classes on the 

 new shoots of ponderosa pine 



Damage 



Number of shoots damaged 



Frequency 



class 



Mean 



Class interval 



of progeny 









Percent 















40 



1 



2.5 



<5 



22 



2 



19 



6-32 



23 



3 



50 



33-67 



13 



4 



84 



68-100 



2 



Table 2 — Analysis of variance of the estimated proportion of gouty 



pitch midge damag 



e on ponderosa pine 





Source of 







F 



variance 



df 



MS 



value 



Block 



9 



0.122 





Stand 



91 



.073* 



3 65 



Block X Stand 



'782 



.020 





'Reduced due to 37 missing plots. 

 'Significant at the 1 percent level of probability. 



Table 3 — Regression coefficients from the best fit stepwise multiple 

 regression equation for damage caused by the gouty pitch 

 midge to ponderosa pine 



Factor 



b value 



Intercept 



-46.786403 



Elevation 



-.000003 



Northwest 



-.0061 17 



Northwest-1 



.029054 



Southwest-1 



109.977010 



Latitude 



1.363577 



Latitude- 1 



-2.356577 



Longitude-1 



-1.788316 



Southwest 2 



2.639739 



Southwest-1 2 



18.317636 



118' 



Figure 2 — Dots are seed source locations 

 for the ponderosa pine provenance test at 

 Lone Mountain Tree Improvement Site and 

 numbers are predicted levels of damage 

 (percentage) by gouty pitch midge for 

 populations of ponderosa pine. Geographic 

 patterns of variation are shown by isopleths 

 (contour lines). The interval between 

 isopleths equals 1 /2 [lsd(0.2)]. Isopleths 

 represent positive or negative deviations 

 from the mean value (x) of all populations. 



3 



