80 
Indian Forest Records. 
[Vol. VIII. 
Arranged by decades the occurrence is fairly steady. 
1869-1878. 
1879-1888. 
1889-1898. 
1 
1899-1908. | 1909-1918. 
3 
1 
1 
1 
2 
3. Plantation No. 5 of 1895, Yanaungmyin Deserve. 
1. Description of the Sample Plots. 
1916. An area for observing tiie ecology of the beehole borer was 
selected by Mr. Unwin in 1916 in this plantation ; the incidence of 
attack was determined, beeholes plugged with bamboo pegs and marked 
with paint, and a plane-table survey made of the positions of the attacked 
trees. The following account of this area is taken from his report, and 
from information supplied by Mr. L. C. Davis, Divisional Forest Officer. 
Area 1*67 acres ; soil a good sandy loam ; on a gentle south-east 
slope at about 500' above M. S. L.; growth of the crop poor mainly 
because of the lack of tending in the past. 
Undergrowth. Fairly dense, the shrubs consisting chiefly of Hemi- 
graphis flava and tree growth of Homalium tomentosum, Stephegyne 
diver si folia and other soft woods. Cephalostachyum pergracile fairly 
abundant. 
Past History. —1899-1900 Cleaned ; 1902-1903 stems seriously injured 
by fire cut back ; 1906-1907 and 1915-1916 lightly thinned, i.e ., all 
growth interfering with dominant teak poles cut back and climbers 
removed ; August 1918 thinned heavily. The light thinnings made 
previous to 1918 removed practically no teak ; when inspected in April 
1918 dead and stagnant teak poles formed the greater part of the stand 
and the canopy was composed mainly of small-crowned, semi-dominated 
trees. 
Fires. —In 1902 about half the plantation was burned and in 1906 
practically the whole area was traversed by fire. The location of the 
sample plot is rather moist and, with the exception of the 2 fires men¬ 
tioned, has remained unburned in both fire-protected and non-fire- 
protected periods. 
The plot (S. P. No. 31) was examined tree by tree on the 18th May 
1916 and a total of 557 trees counted ; of these 94 or 17 per cent, 
showed signs of attack. Mr. Unwin notes that nearly all were 
suppressed or dominated trees and that 6 well-grown trees felled in 
various parts of the plot were barked to see if occluded holes could be 
found ; none were located. 
A second area was selected and demarcated between the 15th and 
29th June (S. P. No. 32). 
[ 308 ] 
