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. (Lepidoptera.Trochiliidae.) 



Particles of poAvder, 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 Xenuphar. (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 wliich lies 

 several minute maggots, supposed to be the larvae of the plum 

 weevil in tlieir winter quarters. 



I am reluctant to publish any observations which are not fully 

 completed and known to be fully authentic. An affection of the 

 ])ai-k of tlic pear tree, however, has been presented to my notice, 

 wliich is of too much interest to be omitted in this place, although 



