EXPERIMENT STATION BULLETINS. 



267 



forest trees. One of these makes its webs early in the spring, chiefly in 

 apple and wild cherry trees ; the other occurs in the latter part of the sum- 

 mer, and infests a much wider range of trees ; frequently occurring in large 

 numbers upon ash, oak, and other forest trees, as well as fruit trees. The 

 former of these is the apple-tree tent-caterpillar {Clisiocampa americana); 

 the latter, the fall web- worm {Hyphantria cimea). I do not care to speak 

 fiirther in this place of the latter. I merely mention it in order that the 

 apple-tree tent-caterpillar shall not be confounded with it. 



The accompanying figiire illustrates the transformations of the apple- 

 tree tent-caterpillar. The eggs are shown at c; these are laid in a ring- 

 like cluster about a small twig, and are covered with a substance, which pro- 

 tects them from the weather. These eggs are laid in mid-summer, and 

 remain upon the trees until the following spring. They may, therefore, be 

 found at any time during the winter months. This fact indicates an excel- 

 lent method of combating this pest. If the trees are carefully searched 

 during that part of the year when they are bare of foliage, the clusters of 

 eggs can be easily found and destroyed. The little machine resembling a 

 pair of shears, attached to the end of a long pole which is used for picking 

 apples, will be found very useful in collecting these clusters of eggs. By 

 the use of it one will be saved the necessity of climbing the trees. All 

 wild cherry trees occuring in the vicinity of the orchard should also be 

 cleared of eggs or destroyed; as these usually serve as breeding places for 

 this pest. 



Early in the spring, just as the buds are beginning to open, the eggs hatch. 

 In many cases this happens before the buds open, and the young caterpillars 

 are forced to gnaw into the buds in order to get food. In this way there is 



