ENEMIES OP THE AGRICULTURIST. 



811 



soda-resin-petroleum paint or spray for other times. 

 When taken early, they may be eradicated ; but when the 

 disease has got into the roots and limbs, the better course 

 is to cut down and burn the tree root and branch, and plant 

 sorts of apples which resist the attacks of the louse. 



Scale or Cocus Insects. Scale insects are at times, 

 when they are allowed to increase, very destructive upon 



Scale Insects. 



pear, apricot, peach, orange and other trees. They ar^ 

 covered by a horny scale or shell when grown, but are 

 more easily kept in check than woolly aphis, unless they 

 have been allowed to become too numerous. They cling 

 to the bark singly and in masses, sucking the juices, 

 portions of which they eject, until black, sticky patches are 

 seen on the wood. The females are stationary, and they 

 cover their eggs with their horny shell until the young 

 hatch out, when the mother insect shrinks and dries up. 

 The eggs and the young scales are carried about on the 

 feet of birds and insects from plant to plant, and also by 

 the wind at times. The males have wings during the 

 autumn season, and are much smaller than the females. 

 Rather appropriate " common " names are given to scale 

 insects thus 1 in the illustration is the oyster scale, that 

 mite which damages oranges and lemons ; 3, muscle scale ; 



