70 Indian Forest Records. [Vol. Vlll 
2. The incidence is relatively higher on the upper and steeper 
slopes than in lower and less steep slopes. 
3. Girth is a far more dominant factor than undergrowth. 
Annual Incidence. 
Owing to the short time at my disposal only 5 trees could be 
dated, of which one was rejected. 
Table 14. —Annual Incidence in a 22-year-old-Plantation, Petsut 
Reserve , Katha , 1919. 
Serial 
num¬ 
ber of 
sample 
trees. 
girth 
in 
inches. 
1 
<N 
O 
1 o 
1 
03 
00 
J 
1903 
O 
o 
| 1905 
1906 
1 
o 
o 
CO 
o 
03 
1909 
1910 
rH 
03 
1912 
1913 
1914 
1915 
1M 1_I 
03 
C3i 
iT-d 
| Total 
5 
25-25 
1 
3 
0 
1 
1 
2 
0 
5 
1 
0 
0 
1 
0 
0 
0 
0 
15 
6 
24-0 
3 
1 
1 
0 
5 
0 
1 
0 
1 1 
0 
12 
8 
19-5 
• • 
i 
1 
0 
0 
1 
3 
1 
0 
1 
0 
2 
0 
! 1 
0 
2 
13 
9 
20-0 
. . 
4 
0 
2 
2 
0 
0 
1 
1 1 
0 
7 
17 
Total 
1 
4 
1 
1 
1 1 
6 
! 8 
7 
1 3 
8 
0 
4 
1 
1 3 
"o 
9 
57 
Reduced 
Values. 
0-3 
1-1 
0-3 
0-3 
,0-3 
1-7 
1 2-3 
2-0 
0-9 
2-3 
0-0 
1*1 
0-3 
0-9 
0-0 
2-6 
16-2 
The curve of annual incidence for these 4 trees is plotted in the chart 
for a mean tree containing 16*25 beeholes. While the total attack 
which is based on 19 trees, is approximately correct the annual fluctua¬ 
tions are probably not representative of local conditions. 
The vertical distribution of beeholes in these sample trees is 
shown in Diagram 3 and Table 35, p. 98. 
Other Localities in Petsut Reserve. 
In 1908 the beehole borer was found by the Divisional Forest Officer 
in the Dobin Chaung Plantation of 1898. In December, 1910 and 
January, 1911, and again in August, 1912 larvae of the beehole borer 
were found plentifully in several plantations thinned by Mr. J. W. 
Bradley, Assistant Conservator of Forests. . 
In a general note on the Nankan Plantations by Mr. A. E. Elmore in 
February, 1909, reference is made to the abundance of the beehole borer 
and an attempt was made to estimate the proportion of beeholed trees 
in the thinned material. 
With regard to the Nami Plantations Mr. Elmore records in Novem¬ 
ber, 1919, that all plantations have been more or less attacked and notes 
[ 298 ] 
