Part III.] Beeson : Beehole Borer of Teak. 
89 
Undergrowth .—Rather scanty, consisting of shrubs up to about 15 
feet and occasional small trees up to about 30 feet; creepers relatively 
few; bamboos absent ; grass and Urena lobata occasional. 
Past History .—There is no record of sylvicultural operations previou s 
to November 1911, when the plantation with others was thinned, and 
opened up where miscellaneous tree growth was encroaching. The 
plantation is said to have been successfully fire-protected up to 1914, 
from which year light fires have passed through it annually. 
2. Enumeration and Analyses. 
In April and May 1916, Mr. Rooke surveyed the area and plugged 
all emergence holes as soon as they were detected ; a total of 211 emer¬ 
gences from the plot of 188 trees was recorded, 34 per cent, of the trees 
being attacked. Between 21st and 30th May 1918, the Forest Zoologist 
inspected the area, and enumerated the attack. Fresh beeholes were 
found in 71 trees, i.e ., 38 per cent.; the distribution of the attack was 
quite irregular. Of the 63 trees noted to be attacked in 1916 only 29 
were reattacked in 1918 ; 42 trees, not recorded as attacked in 1916, 
showed evidence of borer emergence in 1918. The number of beeholes 
pegged in 1918 was 116, against 211 in 1916. The number of trees 
not attacked during the period 1915-1918 is 82 or 44 per cent, of the 
plot. These trees lie mostly in the northern quarter of the plot, where 
the undergrowth is densest; several occur in the centre of the plot 
where the canopy is somewhat open, and several stand near one edge 
where the teak is very branchy or strongly shaded by other tree growth. 
There is thus a slight suggestion that trees are less attacked where under¬ 
growth or adjoining jungle gives lateral shade, and sample trees were 
chosen for analysis to test this condition. The results however defy 
interpretation. 
Number of Trees Analysed —6 : Bate of Analysis —21st-30th May 1918. 
Table 29.— Girth-Beehole Incidence , Pyonchaung , North Toungoo, 1918. 
Serial Number 
of Sample 
Tree. 
Girth in 
Inches. 
Age. 
Class. 
Number of 
Beeholes. 
1 
44 
50 
d 
16 
2 
40 
49 
D 
53 
9 
34 
45 
D 
95 
62 
34 
45 
D 
33 
* 170 
33 
45 
d 
26 
[ 317 ] 
