STATE AGRICULTURAL SOCIETY. 
349 
PEAR. TRUNK. 
2. THE PEAR.— Pyrus cvmmunis. 
Most of the insects which infest the apple will be found to 
attack the pear also, in the same manner, these two trees being so 
closely related to each other. It will not therefore be necessary 
to repeat their names. A few insects, however, appear to pertain 
to the pear exclusively, and some belonging to other trees are 
found upon the pear that have not yet been noticed upon the 
apple. These are named below. 
AFFECTING THE TRUNK, BARK AND LIMBS. 
52. Pear-tree borer, TVochilium Pyri, Harris. (Lepidoptcra. Trochiliid®.) 
Particles of powder, like sawdust, appearing upon the bark, 
thrown out by a worm underneath, resembling the Peach-tree 
borer, but much smaller; feeding mostly upon the inner layers of 
the bark and there changing to a pupa; the moth coming out in 
autumn, resembling a wasp, of a purple black color with a broad 
yellow band on the middle of its abdomen and two narrow ones 
forward of it, its under side golden yellow and its wings clear and 
glass-like, their veins, margin and fringe purplish black, and the 
ends of the forward pair blackish with a coppery yellow gloss. 
Width 0.55. See Harris’s Treatise, p. 256. 
Pigeon Tremex, Tremex Columba , a large soft white worm boring 
deep in the interior of the wood. See Maple insects. 
Plum weevil, Conotrachelus Nenuphar. (See No. 70.) In the 
winter season, small crescent-shaped incisions appearing in the 
smooth bark of the limbs, with the bark upon the convex side of 
this wound elevated in a slight blister, in the cavity of which lies 
several minute maggots, supposed to be the larvae of the plum 
weevil in their winter quarters. 
I am reluctant to publish any observations which are not fully 
completed and known to be fully authentic. An affection of the 
bark of the pear tree, however, has been presented to my notice, 
which is of too much interest to be omitted in this place, although 
