_ 
10 BULLETIN 1112, U. S. DEPARTMENT OF AGRICULTURE. 
TaBLe 7.—Basic data for 107 felled trees showing the effect of mistletoe on the growth and — 
seed production of western yellow pine—Continued. j 
: Diame- P De- Aver- | Aver- 
Diam- Height Volume 
eter ter Total | growth Total growth| 8T& | Crown! , 28° age | Seed 
Tree number.| Age. growth |, .. - of length} length) crop 
breast jariagt height.| for last = for last Ruifee: class. of | of leaf| 1915. 
high. 5 years. * 15 years.| 4: . . 
5 years. tion. leaves. | tufts. 
| 
Years.| Inch. | Inch..| Feet. | Feet. |Cu.ft.| Cu. ft. Inch. | Inch. 
7A, Sipe Bes i ae 93 6.8 0.1 25 1707} 2:30 1.80 | xxx Cc oo oe oO 
Oi Ck S45. Fe 93 8.9 -4}] 36.0 1/0 8.65 1.01 x xX 4.5 6.5 | -O 
Dee Oye ee 2 94} 12.0 15: | "4055 1.0 | 15.18 4. 40 0) FS es Oo 
42 SX. sees te 94 14. 8 -2| 41.5 .5 | 20.08 o67, |" 2eax x 4.5 5.6 Oo 
eae ee 94; 9.8 -7| 39.0 1.0 | 7.80 BY if slkue.2-0-« Cc Soll 4.6| O 
oes A 95 4.0 oul: 21.0 1.0 4 316) sxx Ss aU ee O 
5O-ee 3oeses - 95 14.4 ao 42.5 1.0 | 16. 37 242 [ xx Cc 4.0 5.0 O 
ey fee eae 97 9.0 SO tee SRO 1.0] 7.06 . 85 x C 4.6 5.3 Oo 
a ed ee 98 18.1 155) | “6425 6.0 | 47.49 6. 48 x xX 6.3 11.3 O 
715 oe Re eee 100 8.3 wz | »30..0 ed) (24. 23 228. |) ex. D 4.5 3.6 oO 
SO soe SSS NS. 100 14.6 . 2 495-5 1.0 | 20.05 1.08 | xxx Cc ae ine) O 
Ue eee 102 | 20.6 1.0| 64.5 3.0 | 52. 44 6. 81 ro) C 4.7 6.3 O 
i Ae She ee a 104 12.4 sor] V4155 The fa Beis} 1 a yf fo) aK si 6.1 Oo 
OS SRSA Saks 104 21.6 1 Ee! 73.0 3.5 | 63. 47 5.73 to) Cc 4.8 Sak L 
Vt See ee Bee 105 20. 4 .6 60. 5 1.5 | 62. 11 4. 30 >.< Cc 5.2 7.2 O 
v1) 5 SR Oe 2 ra 106 9. 4 -8 53. 0 3.0 8. 62 - 92 D:.4 Cc 5.0. 1s > 4626 Oo 
Ak ee ee 112 11.6 1.25), 62.0 3.5 | 18. 82 5. 59 (0) C 5.04-> 1056 oO 
OG42 5 fe. 114 18.8 a6 70.5 1.0 | 43. 68 1. 64 5x c 4.3 6.8 Oo 
Oe hs ee 117 20. 4 1.0 78. 0 3.0 | 69. 85 5.05 (e) C B61 NAVs L 
1 OA ae eee 120 19.4 4 67.0 1.0 | 42. 59 | Bis y- xx C 4.31 3.6 O 
OT RELIC SS 120 22.4 17 79. 5 2.5 | 83. 56 11. 32 3) C 5.4} --6.8 L 
8 AB see ee oe 121 11.9 ~8 | *98.0 1.0 | 16.10 1209 |tsexx C 5.31 6.6 O 
DUS Ae Gate 123 17.6 at 46.5 -5 | 21. 86 58) |) Saxo x 4.6 1 Oo 
One? =, ee 124 20. 2 1.7)) $68:5 1.0 | 67.68 9. 40 fe) x 6.0 9.0 O 
1) aoa eel ae 195 | 171 -4| 68.0 1.0} 43.33] 3.75 | xx C 5.1| 5.0} O 
Rie, 3 ae ee Se 126 | 20.3; oe 55.5 -3 | 42.03 1.49 | xxx x 4.0 1-255 O 
DOS ee ae 130 | 23.4 2.3 79. 5 PSS V92Z.:78 8. 56 fe) D a20 8.3| M 
DOI ieee es 134 18. 2 a2 45.0 -5 | 25. 23 82}. )) Sek D 3.6 2.5 O 
1G SS 328 fs 138 | 20.2 .4 59. 5 -5 | 50.01 3. 74 x x 51 11.5 O 
alt Sean oe ae 214 19.2 1.2)| “6725- 1.5 | 44.90 4.27 (0) C 5.6 Wet L 
10D Ae ee 214 23.0 1.4 85.0 1.0 |108. 80 7.98 (0) D 5.5 5.3 |,M 
3 a8 ae pa eam 217 15,2 5) °5855 1.0 } 32.92 2262) | xexsx xX 4.7 8.3 L 
SOS tar 218 18.2 .4 78.5 -2 | 59.68 2 00! | SE C Ses ee ee O 
LOO eee 218 20. 8 «id tad 455; | ZL. 92 2.63 fo) C 5.3 522 O 
AQ was 218 25.6 118; 87.5 1.0 |133. 67 10. 17 (0) x 4.8 5.8 L 
31h Eee ee ae 220 16. 0 ail 84.5 -3 | 54.91 161592 sexx Cc 5.0 41 O 
ee tee bes St 220 21.6 2S) | MOO 1.0 | 90. 26 7. 06 fo) D 5.8 leo M 
8. Re 230 25. 6 4 76.5 -3 |107. 47 2 OSi |" RK x ae? 8.8 O 
SUC So eile ae 233 17.6 ay 72.0 #5 | 65. 5-68) |° axx C 4.5 5.6 O 
—T 
Oo 
Figure 1 shows the graphic growth analysis diagram for tree No. 4, 
a typical healthy western yellow pine, while Figure 2 shows the same 
kind of a diagram for tree No. 27, which was heavily infected with 
mistletoe. Both trees grew within a short distance of each other on 
the same site; they were of practically the same age and both belonged 
to the isolated crown class and the 101 to 140 year age class; there- 
fore these factors can not be held accountable for the material falling 
off in the increment of the heavily infected tree. The very marked 
decrease in the rate of growth during the last 30 years, evidently due 
to the parasitism of the mistletoe, is very clearly shown by the close- 
ness of the last seven quinguennial lines near the outside of the cone 
in Figure 2, which represents the growth of tree No. 27. 
A set of curves was drawn for each tree showing the relation of 
age to diameter breast high, total height, and volume. This curving 
eliminated the irregularities and irrelevant abnormalities occurring 
in each tree. The data for the individual trees were then averaged 
by a series of harmonized curves for each infection and 40-year age 
