94 Indian Forest Records. [Vol. VIII. 
together with 4 trees felled in December 1917 is given in Table 31 
below. 
Number of trees Analysed— 15 [including 4 felled in the 1917 
thinning.] Date of Analysis— 12th- 17th May, 1918. 
Table 31. — Girth-Beehole Incidence in a 13 year-old Plantation , 
Bondaung , South Toungoo, 1918. 
3 Inch Girth 
Class. 
- 
1 
! Serial 
! Number 
of 
Sample 
Trees. 
Girth in 
Inches. 
Number 
of 
Beeholes. 
Arithmetic 
mean of 
Girth- 
Class. 
Arithmetic 
mean 
Beeholes 
per Girth- 
Class. 
r 
! 49 
10 
2 
1 
47 
12 
0 
... 
10—12 . j 
1 
25 
12 
4 
... 
1 
i 
58 
10 
3 
10-66 
*2*16 
1 
27 
10 
0 
• •• 
1 
l 
88 
10 
4 
... 
• • • 
13—15 | 
r | 
52 
43 
15 
13 
1 
1 
14*0 
Vi-o 
16—18 | 
; 1 
i ! 
2 
173 
18 
17 
3 
3 
17*5 
3*0 
j 
r 1 
66 
19 
5 
... 
19—21 J 
98 
21 
5 
19*7 
*4-7 
1 
5 f 
19 
4 
... 
22—24 £ 
1 
3 
4 ! 
i 
24 
24 
i 
15 
15 
24*0 
150 
The arithmetic mean girth of the sample trees is 15*6 inches and 
the arithmetic mean number of beeholes per tree is 4’27. From the 
girth-beehole graph based on the above class means, the beehole value 
for a typical 13 year-old tree of 18*3 inches girth is 3*8. Compared 
with other plots this is a rather high index of attack ; from records 
in the plantation journals and observations made by the divisional 
officer, the neighbourhood of the Thabyewa is apparently badly infested 
by the borer. 
The annual distribution of the 64 beeholes in the dateable trees is 
as follows:— 
Table 32.— Annual Incidence in a 13 year-old Plantation , Bondaung , 
South Toungoo , 1918. 
< 1905 - 
1908 . 
1909 . 
1910 . 
1911 
1912 . 
1913 . 
1914 . 
1915 . 
t 
j 1916 . 
1917 . 
1 
Total . - 
Combined Attack 
0 
2 
1 
4 
6 
9 
5 
13 
13 
u ! 
15 Trees. 
Reduced values 
0-00 
0-12 
! 0-06 
0*25 
0*38 
0-57 
0'32 
i 
0-83 
J 
\\ 0*83 
i j 
0*76 
1 
4-0 
r 32a ] 
