Maple. 313 



green, while at the posterior extremity there project two black 

 horns, each about a quarter of an inch in length. The larvae 

 feed upon the foliage of the trees, being particularly injurious 

 in the western states, where shade trees are in certain years 

 entirely defoliated. There are two or three broods, depending 

 upon the latitude. 



Treatment. The best and most effective remedy is to spray 

 the trees with Paris green or some similar poison, whenever such 

 a course is practicable. In other cases, the larvae may be caught 

 in trenches about a foot deep that are dug in concentric circles 

 about the bases of the trees. The larvae wander from the tree 

 to pupate, and they will collect in the trenches, where they may 

 be easily destroyed. 



Tussock Moths (Orgyia, sp.). Description. There are several 

 species of tussock moths which resemble each other very 

 closely. The caterpillars when grown are about an inch in 

 length; the body is yellow in color, and generally is marked 

 by a narrow, dark band extending along the back. The sides 

 of 'the body may be similarly marked. Upon the back, just 

 forward of the center, may be found four thick tufts of yellow- 

 ish hair, while from the second segment of the body there 

 extend two long black plumes. A single plume extends back- 

 ward from the rear of the body. The larvae hatch during May 

 from eggs which were laid upon the silken cocoons by the 

 female during the preceding fall. In about five weeks the 

 larvae begin to pupate, the adults appearing a week later. 

 Only the males possess wings; these expand nearly an inch 

 and a half. The ground color is ashy gray, but several dark 

 lines cross the fore wings. As a rule there are two broods. 



Treatment. These insects cause much injury to shade trees, 

 and if unchecked they gradually increase in numbers so that 

 the trees are each year defoliated. The most practical remedy 

 appears to be to collect the cocoons while the trees are dormant. 

 As the eggs are laid upon the surface of the cocoons they may 

 be easily discovered. The cocoons may be found upon the 

 branches and trunks of infested trees, and also upon fences 

 and in sheltered spots in the neighborhood. The larvae are 

 also easily killed by the arsenites, although the application of 

 the latter is not always practicable. 



