70 INSECTS AFFECTING THE PEAR. 



beyond the reach of insecticides, and as it deserts 

 the leaves before they fall, gathering and burning 

 them in autumn will do little or no good. It seems 

 probable, however, that by spraying with kerosene 

 emulsion two or three times in autumn, when they 

 are migrating to the twigs, and before they have 

 penetrated deeply between the scales, a large propor- 

 tion of them would be destroyed. 



INJURING THE FRUIT. 



The Codling Moth and Plum Curculio. 



These pests are the worst insect enemies of the fruit 

 of the pear. To the first is due the " worminess " 

 that spoils so large a portion of the crop, and to the 

 second a large part of the gnarly, knotty fruit that is 

 so often seen. Spraying with Paris green is fortu- 

 nately an effectual preventive of the injuries of both. 



Other Pear Insects. 



The trunk of the pear tree is subject to attack from 

 both the Round-headed and Flat-headed Apple-tree 

 Borers. The remedies mentioned as applicable to 

 the apple are equally so to the pear. The branches 

 are sometimes infested by the Oyster-shell Bark-louse, 

 the Pear-tree Bark-louse {JLecanium pyri), and the 

 Pear-tree Psylla (Psylla pyri), as well as the Pear- 

 blight Beetle (Xyleborus pyri). The leaves are also 

 liable to attack from a great variety of caterpillars, 

 which, however, are seldom seriously injurious. 



