Part Beeson : Beehole Borer of Teak. 
*73 
(Trees Nos. 84, 86 and 87 showing signs of attack but outside the 
area after demarcation are not included). There was apparently no 
difference in the nature of the stand or of the undergrowth in the 3 
sections. 
1919. The writer worked in this area at the end of May, 1919, and 
carried out analyses of trees felled in the sample plot. 
Number of Trees Analysed -19. Bate of Analysis —28th May—2nd 
June 1912. 
The following table 16 gives the data for the girth-beehole incid¬ 
ence, and the approximate ages of the trees : 
Table 16.-+- Girth-Beehole Incidence in Natural Forest , 31 — 16 years 
old Oklcyi, Shwegu, 1919. 
3-Inch 
Girth-Class* 
10—12 
16—18 
19—21- 
25-27- 
31—33 
Serial 
Number 
of 
Tree. 
Girth 
in 
Inches. 
Approxi¬ 
mate 
Age. 
Number 
of 
Beeholes. 
Arithmetic 
Mean 
of 
Girth-Class. 
Arithmetic 
mean Beehole 
per 
Girth-Class. 
34—36<j 
37—39- 
40—42 
14 
11-75 
16 
4 
11*75 
4*0 
5 
16* 0 
39 
10 
16-0 
10-0 
2 
21* 0 
42 
40 , 
1 
8 
20 -0 
38 
11 
y 
20* 3 
21-7 
10 
20- 0 
40 
14 1 
j 
7 
26*75 
41 
5 
i 
16 
25-5 
42 
23 
25* 8 
12*3 
18 
25*25 
31 
9 
j 
4 
12 
32* 0 
32* 0 
42 
39 
71 
45 
$ 
32* 0 
58-0 
1 
36* 0 
42 
31 1 
h 
i 
i 
6 
11 
36-75 
34-25 
47 
40 
80 
22 
r 
35* 4 
45*7 
13 
34- 5 
35 
50 
j 
i 
9 
39-75 
48 
38 
i 
15 
37* 5 
35 
48 
l r 
38* 7 
41-7 
19 
39- 0 
42 
39 
1 
3 
17 
40* 0 
41- 5 
42 
31 
23 
40 
40* 7 
31*5 
It will be observed that there is a much greater variation in the 
number of beeholes per tree, in this group of uneven-aged trees, than in a 
plantation, and also that the means for the girth-classes do not form a 
steady series. One of the youngest trees, for example, No. 17, has the 
greatest girth and a high number of beeholes. The derivation of an 
index of attack for this area must, therefore, be largely arbitrary. 
The arithmetic mean girth of the sample trees is 27‘6 inches, the 
arithmetic mean number of beeholes is 3T7, and the arithmetic mean age 
[ 301 ] 
