THE BARK LOUSE. 37 



louse, often finds its way into the nursery, and unless 

 the necessary precaution is taken, it will spread 

 rapidly. Purchasers should be careful to give in- 

 structions that no trees so affected, should be sent 

 to them, for, until these little insects are removed, 

 the trees will make but small headway in the young 

 orchard. 



