Part III.“| Beeson: Beehole Borer of Teak. 
61 
Past History. —Thinned and cleaned in November 1903 ; thinned in 
August and November, 1906, removing 143 trees per acre ; thinned in 
November, 1909, removing 120 trees per acre ; thinned in December, 
1914, leaving about 260 trees per acre ; trees top-broken by wind of 
one or two seasons previously were felled in February, 1918. 
The plantation was fire-protected up to 1914, but was burnt in 1899, 
and again in March 1901. From 1914 protection was abandoned, and 
as the locality is mainly dry forest it was probably burnt over each year. 
2. Results of Analysis. 
Number of Trees Analysed =27 [including 5 felled in February, 1918] 
Date of Analysis. —15th—24th May, 1919. 
The tables below show the relationship of girth to beehole attack in 
area. 
Table 8. — Girth-Beehole Incidence in a 21-year-old plantation , Mohnyin 
Reserve , Katha , 1919. 
Serial 
Arithmetic 
Number 
Girth 
Number 
Arithmetic 
Mean 
of 
in 
of 
Mean of 
Beeholes 
Sample 
Inches. 
Beeholes. 
Girth-Class. 
per 
Tree. 
Girth-Class. 
4 
16-25 
0 
5 
18 
17-0 
2 
17-0 
f 10 
3 
17-75 
1 
J 
16 
20-0 
0 
I 
17 
12 
19-0 
19-5 
1 
1 
^ 19-5 
2-0 
2 
19-5 
6 
J 
14 
19 
230 
23-0 
5 
2 
] 23-0 
3*5 
10 
27-0 
0 
> 25-8 
23 
24 
25-0 
25-25 
5 
1 
3-25 
25 
26-0 
7 
) 
5 
30-0 
15 
5 
13 
29-0 
5 
[ 29-1 
6 7 
22 
28-5 
0 
5 
21 
31 
34-0 
36-0 
9 
12 
] 35-0 
1 ) 
10-5 
15 
44-25 
15 
44-25 
15-0 
3 Inch 
Girth-Class. 
r 
16—18^ 
19—21 
22—24 
-27- 
28—30 
34—36 £ 
43—45 
The arithmetic mean girth of the sample trees is 27*9 inches and the 
arithmetic mean number of beeholes per tree is 4*5. The girth of a 
normal 21-year-old tree according to Leete is 27*7 inches ; the sample 
trees taken, therefore, are sufficiently representative to give a correct 
girth-beehole value for this plot. Beading from the curve drawn through 
[ 289 ] 
