THE WESTERN" YELLOW PINE MISTLETOE. 



15 



Table 9. — Comparison of the average height groivth or accretion of 102 felled western 

 yellow pine trees, for a 25-year period, grouped by age classes and degree of mistletoe 

 infection. 











Accre- 





Accre- 





Accre- 





Accre- 





Accre- 







De- 



Total 



tion 





tion 





tion 





tion 





tion 





Age 

 class. 



gree 



heiglit. 



1890- 



Total 



1895- 



Total 



1900- 



Total 



1905- 



Total 



1910- 





of 







1895, 



height, 



1900, 



height, 



1905, 



height, 



1910, 



heisht. 



1915, 



Basis. 



infec- 

 tion. 







pen- 

 odic 



1900. 



pen- 

 odic 



1905. 



peri- 

 odic 



1910. 



peri- 

 odic 



1915. 



peri- 

 odic 

















1890 



1895 



annual 





annual 





annual 





annual 





annual 





Years. 





Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



Trees. 



2ito60 







3.2 



5.4 



0.44 



8.0 



0.52 



11.3 



0.66 



14.9 



0.72 



18.6 



0.74 



11 





X 



2.6 



5.1 



.50 



8.3 



.64 



12.2 



.78 



15.3 



.62 



18.2 



.58 



6 





XX 



1.6 



3.2 



.32 



4.6 



.28 



6.1 



.30 



7.4 



.26 



8.6 



.24 



7 





XXX 



1.3 



2.5 



.24 



3.8 



.26 



4.9 



.22 



5.7 



.16 



6.3 



.12 



5 



61 to 100.... 







27.4 



31.5 



.82 



35.6 



.82 



39.5 



.78 



43.2 



.74 



46.6 



.68 



12 





X 



29.6 



32.2 



.52 



34.6 



.48 



36.8 



.44 



38.8 



.40 



40.8 



.40 



7 





XX 



23.7 



26.1 



.48 



28.3 



.44 



30.5 



.44 



32.1 



.32 



33.3 



.24 



9 





XXX 



23.4 



28.4 



.40 



30.0 



.32 



31.2 



.24 



32.2 



.20 



33.0 



.16 



17 



101 to 140... 







58. 9 



61.5 



.52 



64.2 



.54 



66.9 



.54 



69.7 



.56 



72.5 



.56 



6 





X 



49.4 



51.8 



.48 



53.5 



.34 



55.0 



.30 



56.4 



.28 



57.5 



.22 



4 





XX 



55.8 



57.9 



.42 



60.0 



.42 



61.9 



.38 



63.5 



.32 



65.0 



.30 



4 





TXT 



46.4 



47.8 



.28 



49.0 



.24 



50.0 



.20 



50.6 



.12 



51.2 



.12 



4 



201 to 240... 







75. 5 



76.7 



.24 



77.8 



.22 



78.9 



.22 



80.0 



.22 



81.2 



.24 



5 





XXX 



71.4 



72.0 



.12 



72.5 



.10 



73.0 



.10 



73.5 



.10 



74.0 



.10 



5 



Table 10. — Comparison of the average volume groivth or increment of 102 felled western 

 yllow pine trees, for a 25-year period, grouped by age classes and degree of mistletoe 

 infection. 



Age class. 



De- 

 gree 

 of 

 in- 

 fec- 

 tion. 



Total volume. 



Increment, 

 1890-1895. 



Total 

 volume. 



Increment, 

 1895-1900. 



Total 

 volume. 





1890. 



1895. 



Periodic annual. 



1900. 



Periodic annual. 



1905. 



Years. 

 21 to 60 





 X 

 XX 

 XXX 

 

 X 



XX 

 XXX 

 

 X 

 XX 

 XXX 





 XXX 



Cubic 



feet. 

 0.36 

 .02 

 .01 



Cubic 



feet. 

 0.54 

 .05 

 .02 



Cubic 



feet. 

 0.036 

 .006 

 .002 



Per 



cent. 



(1) 



Cubic 



feet. 



0.80 



.20 



.08 



.04 



7.54 



7.10 



3.98 



5.72 



44.80 



34.80 



28.62 



22.87 



69.38 



56.56 



Cubic 

 feet. 



0.052 

 .0.30 

 .012 

 .008 

 .428 

 .238 

 .148 

 .156 



1.004 

 .930 

 .454 

 .366 



1.088 

 .440 



Per 

 cent. 



Cubic 

 feet. 

 1.19 

 .41 



" 







.14 









.08 



61 to 100 



101 to 140 



202to240 



3.77 

 4.90 

 2.53 

 4.12 

 35.10 

 25.95 

 23.72 

 20.02 

 59.06 

 52.16 



5.40 

 5.91 

 3.24 

 4.94 

 39.78 

 30.15 

 26.35 

 21.04 

 63.94 

 54.36 



.326 

 .202 

 .142 

 .164 

 .9.36 

 .840 

 .526 

 .204 

 .976 

 .440 



8.6 

 4.1 

 5.6 

 4.0 

 2.7 

 3.2 

 2.2 

 1.0 

 1.7 

 .8 



7.9 

 4.0 

 4.0 

 3.2 

 2.5 

 3.1 

 1.7 

 1.7 

 1.7 

 .8 



10.23 

 8.49 

 4.81 

 6.46 

 50.26 

 39.20 

 30.75 

 24.10 

 75.72 

 58.94 



Age class. 



De- 

 ^ee 

 of 

 in- 

 fec- 

 tion. 



Increment, 

 1900-1905. 



Total 

 volume. 



Increment, 

 1905-1910. 



Total 

 volume. 



Increment, 

 1910-1915. 



Ba- 





Periodic annual. 



1910. 



Periodic annual. 



1915. 



Periodic annual. 





Years. 

 21 to 60 





 X 

 XX 

 XXX 

 

 X 

 XX 

 XXX 

 

 X 



XX 

 XXX 





 XXX 



Cubic 

 feet. 



0.078 

 . ,042 

 .012 

 .008 

 .538 

 .278 

 .166 

 .148 



1.092 

 .880 

 .426 

 .246 



1.268 

 .476 



Per 



cent. 

 (1) 



Cubic 



feet. 



1.81 



.86 



.24 



.18 



13.52 



9.89 



5.65 



7.12 



56.48 



43.72 



32.70 



25.32 



82.46 



61.38 



Cubic 



feet. 



0.124 

 .090 

 .020 

 .020 

 .658 

 .280 

 .168 

 .132 



1.244 

 .904 

 .390 

 .244 



1.348 

 .4SS 



Per 



cent. 

 (1) 



Cubic 



feet. 



2.67 



1.25 



.37 



.29 



17.28 



. 11.49 



6.52 



7.70 



63.41 



48.07 



34.60 



26.42 



90.12 



64.00 



Cubic 



feet. 



0.172 



.078 



.026 



.022 



.752 



.320 



.174 



.116 



1.386 



.870 



.380 



.220 



1.532 



.524 



Per 



cent. 

 (1) 



Trees. 

 11 





6 











7 











5 



61 to 100 



7.1 

 3.9 

 4.2 

 2.6 

 2.4 

 2.5 

 1.5 

 1.1 

 1.8 

 .8 



6.4 

 3.3 

 3.5 

 2.0 

 2.5 

 2.3 

 1.3 

 1.0 

 1.8 

 .8 



5.6 

 3.2 

 3.1 

 1.6 

 2.5 

 2.0 

 1.2 



.9 

 1.9 



.9 



12 



101 to 140 



201 to 240 



7 

 9 

 17 

 6 

 4 

 4 

 4 

 5 

 5 



1 The periodic annual increment per cent was not computed for the 21 to 60-year age class because of the 

 extremely small initial volumes and the proportionately great effect on the percentage of slight individual 

 variations. 



