Part III.] Beeson: Beehole Borer of TeaJc. 81 
Description .—Area 4*76 acres ; soil and location as in previous plot, 
but aspect west. Undergrowth as in previous plot. The plot con¬ 
tained 1,645 trees of which 400 or 24 per cent, showed signs of attack. 
Seventeen trees, that were not obviously attacked, were felled and 
barked ; 6 of these showed one or two holes. 
1918. The area was inspected by the writer between the 3rd and 
12th June 1918 ; detailed examination was confined to a small plot 
of 190 trees on 0*47 of an acre in the centre of the worst affected part 
of Mr. Unwin’s larger observation area. The percentage of attack 
in 1918 was found to be 5, as against 39 per cent, for the same plot in 
1916. The figure obtained at the first enumeration undoubtedly includes 
earlier non-occluded holes in addition to the 1916 holes. Of the 74 
trees recorded as attacked in 1916, 4 were reattacked and 5 new trees 
were attacked. The plot was moderately thinned (72 trees removed 
and 118 left standing) and the whole of the undergrowth felled. 
2. Results of Analyses . 
Number of Trees Analysed —22. Date of Analysis —3rd-12th June 
1918. 
Table 23.— Girth-Beehole Incidence in a 23 year-old Plantation, 
Yanaungmyin Reserve, Pyinmana, 1918. 
3 Inch 
Serial 
Number 
Girth 
Number 
Arithmetic 
mean of 
Girth- 
Classes. 
Arithmetic 
mean 
Girth- 
of 
in 
Class. 
of 
Beeholes 
Class. 
Sample 
Tree. 
Inches. 
Beeholes. 
per Girth- 
Clas s. 
7—9 
153 A 
9 
s 
0 
90 
0-0 
1 
f 
174 B 
10 
s 
n 
I 
1 
134 c 
10 
s 
1 | 
10—12 
4 
i 
176 
12 
s 
8 ^ 
11*2 
3-2 
1 
l 
136 
12 
s 
5 I 
l 
175 D 
12 
s 
1J 
13—15 
. 
149 A 
15 
s 
15-0 
10 
r 
158 
16 
s 
6 ) 
16—18 
1 
152 A 
16 
s 
3 
16-7 
4-3 
i 
L 
174 D 
18 
s 
4 3 
l 
r 
130 
19 
s 
9 7 
19—-21 
i 
132 A 
20 
d 
3 r 
20-0 
5-7 
i 
154 
21 
s 
5 ) 
22—24 
i 
r 
» 
172 A 
166 
22 
24 
d 
s 
11 } 
23] 
230 
170 
i 
r 
129 A 
25 
d 
17 J 
25—27 
134 C 
25 
s 
6 C 
25-3 
90 
1 
l 
152 E 
26 
d 
4 V 
19; 
290 
190 
28—30 
# 
162 B 
29 
1 s 
31—33 
i 
r 
133 C 
142 
31 
33 
i d 
D 
X 
25) 
320 
110 
34—36 
• 
200 A 
34 
: D 
340 
250 
[ 309 ] 
