158 



INSECTS INJURIOUS TO THE PEAR. 



faced locust, Tragocephala viridifasMa (De Geer). There 

 are many other species which might be referred to, but 



FIG. 166. 



these will suffice to illustrate the family, all the members of 

 which are destructive, especially during the latter part of the 

 summer. 



When young trees are deprived of their leaves in the midst 

 of their growth, they fail to ripen their wood properly, and 

 their vitality is weakened so that they are more liable to 



FIG. 167. 



injury from winter, and also more prone to disease. Grass- 

 hoppers do not confine their attacks to the pear, but devour 

 also the leaves of young apple, plum, and other trees. 



To destroy these pests, the trees, when not fruiting, may 

 be syringed with Paris-green and water in the proportion of 

 two teaspoonfuls of the poison to two gallons of water. 



