88 
Indian Forest Records. 
[Vol. VIII. 
The data in the preceding table are plotted on the Annual Incidence 
Chart as Group 2 of the Yanaungmyin series in solid black. The reduc¬ 
tion value for the mean tree is the same as that for Group 1, i.e ., 13-7 
beeholes. 
If the three incidence curves are mutually compared, it is evident 
that there is a marked general resemblance, particularly in the period 
1910-1918, and, as the data for one of the curves wer<» collected 12 
months before those for the other two, and no adjustments have been 
made for the loss of stumpage in Group 2, the working error is very 
small. 
The height distribution of the beeholes in this sample plot is discussed 
on page 99. (Vide Table 35 and Diagram 3). 
Other Localities. 
Mr. Butterwick found ceramicus larvse in the 1895 plantation on 
he 1st August 1915 and notes that empty larval galleries were numerous. 
Mr. Unwin records the presence of the borer in 1916 in most of the 
Yanaungmyin plantations, more especially in No. 5, of 1895, No. 6 of 
1896 and No. 3 of 1893, but less abundant than in the last two. In 
natural forest no instances of borer attack were discovered. 
Natural Forest .—On the 11th June, 1918 a teak tree, one of a group 
in unclassed forest just outside the Reserve, was felled by the Forest 
Zoologist and analysed. Its girth was 4' 8" ; the number of 9 inch 
billets cut up was 82 ; the only signs of borer attack found were in 
billet No. 1, failed larval work of 1896, and billet No. 69, a larval gallery 
of 1909. It may be noted that this tree stood close to the fire-line which 
is burnt annually. 
4. Sample Plot in North Toungoo. 
1 . Plantation 1873, Pyonchaung Reserve. 
1. Description of the Sample Plot. 
The plot was selected by Mr. W. C. Rooke, Extra Assistant Conser¬ 
vator of Forests in the south-west comer of the Pyonchaung Reserve, 
as an observation area in April, 1916 (area 1-70 acres). The crop is 
fairly dense and chiefly remarkable for its excessive height growth due 
to the absence of thinnings early in the history of the plantation. The 
average girth of the trees was about 3' 3J" in 1916, with some of 6' 3" 
on the margins towards the open. 
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