224 DISEASES AND ENEMIES OF GROWING PLANTS. 



*|v seen in the form of a small bracelet or broad 



ring around the slender twigs when the leaves 



have fallen from the trees. With a little 



observation these can be readily distinguished, 



^B& and by means of a light ladder the twigs 



containing them may be reached, when they 



t| B should be cut off and burned. This, if done 



any time during the winter, will save much 



trouble in the spring after they have hatched. 



rfl 795. The best means of protecting trees 



Fig. 54. against the canker-worm, (Fig. 55,) is by 



preventing the deposit of the egg. The wingless female 



(Fig. 56,) lays her eggs (Fig. 57, natural size and 



Fig. 55. Fig. 5G. Fig. 57. 



magnified,) on the bark of the tree, and ascends the tree 

 for this purpose during the warm days of winter and 

 spring. A coating of tar on a strip of cloth round 

 the trunk, frequently renewed during that time, will often 

 prevent her ascent ; or a little trough may be put round 

 the tree filled with a mixture of tar and oil, enough 

 oil being put in to keep it in a liquid state, or with 

 \ / the &quot;bitter water&quot; obtained in the 



t^^^^kA^^Mi manu f ac turc of salt, which will 

 ^^ have the same effect. This will 

 (l neither freeze nor evaporate read 



ily. The winged male is shown in 



Fig. 58. J co 



figure 58. 



796. The codling moth, (Fig. 59,) produces the small 

 whitish worms that bore holes into the young unripe 



