140 INSECTS AFFECTING SHADE TREES. 



Red Cedar and Arbor Vitse are especially subject to 

 attack. Its injuries are sometimes very severe on 

 shade trees in city streets and public parks. There 

 are several parasitic insects that prey upon the larvae. 



Remedies. — The simplest remedy for this insect 

 is that of spraying with London purple or Paris 

 green. This should be done in early summer when 

 the worms are young. Effective work also can be 

 done, according to Dr. Riley, " during the wintertime 

 or when the trees are bare. The bags which contain 

 the hibernating eggs, and which are very easily de- 

 tected then, may be gathered or pruned and burned. 

 This work may be so easily done that there is no ex- 

 cuse for the increase of this species. Where intelli- 

 gent action is possible, the bags were better collected 

 and heaped together in some open enclosure away 

 from trees, rather than burned. By this means most 

 of the parasites will in time escape, while the young 

 Bag-worms, which will in time hatch, and which 

 have feeble traveling power, must needs perish from 

 inability to reach proper food." 



The Green-striped Maple-worm. 



Anisota rubicunda. 

 In many Western States maple trees are regularly 

 defoliated by a large caterpillar, alternately striped 

 with light yellowish-green and dark-green, having 

 two long, black horns on the second segment behind 

 the head, and other similar but shorter horns on the 

 posterior segments (Fig. 70, a). This is the Green- 



