PACKARD.] THE POPULATION OF AN APPLE TEEE. IGl 



7. The Jfopulatmn of an JJ.pple Tree* 



A FRENCH author has written a very pleasant little 

 book entitled the "Population of a Pear Tree." Of 

 the population of an apple tree a ponderous tome 

 could be written, but in this essay on the insects injuring 

 this facile princeps of our fruit trees, we shall confine our- 

 selves mainly to the more injui-ious kinds, giving a brief and 

 condensed account of the most important species. About 

 seventy-five species in all are known to prey upon the apple 

 tree. We may first consider those kinds found 



PREYING UPON THE ROOTS. 



TJie Pear Blight, or Eriosoma ivjri (Fig. 127 ; a, the gall ; 

 6, larva ; c, female ; c?, leg ; e, beak ; /, antenna of female ; 



Fig. 127. 



Blight Insect. 



<7, of larva ; after Riley) sometimes causes a good deal of 

 disturbance to the health of the tree, lessening the vigor 

 of its growth and causing the leaves to turn of a paler and 

 more yellowish hue than usual. If there is no borer under 

 11 1 



