INSECTS INJURIOUS TO TREES 145 



States. It even feeds on evergreens, killing the trees 

 by a single defoliation. 



The insect appears in the caterpillar stage from April 

 to July. It feeds at night and rests by day. The mature 

 caterpillar, which is dark in color, may be recognized by 

 rows of blue and red spots along its back. After July, 

 egg masses are deposited by the female moths on the bark 

 of trees, and on leaves, fences, and other neighboring objects. 

 Here they remain over the winter until they hatch in the 

 spring. The flat egg masses are round or oval in shape, 

 and are yellowish-brown in color. See Fig. 102. 



Remedies: Spray for the caterpillars in June with 

 arsenate of lead and apply creosote to the egg masses 

 whenever found. 



THE BROWN-TAIL MOTH 



Life history: This insect was introduced here from 

 Europe in 1890 and has since done serious damage to shade, 

 forest, and fruit trees, and to shrubs in the New England 

 States. 



It appears in the caterpillar stage in the early spring 

 and continues to feed on the leaves and buds until the last 

 of June. Then the caterpillars pupate, the moths come out, 

 and in July and August the egg clusters appear. These 

 hatch into caterpillars Avhich form nests for themselves 

 by drawing the leaves together. Here they remain pro- 

 tected until the spring. See Fig. 103. 



Remedies: Collect the winter nests from October to 

 April and burn them. Also spray the trees for caterpil- 

 lars in early May and especially in August with arsenate 

 of lead. 



