126 



THE CULTIVATED EVERGREENS 



If other trees are growing with them, the partly grown cater- 

 pillars may migrate to the pines, causing a stripping of the 

 leaves. The larvae become full grown about the first week of 



July. The full-grown cater- 

 pillar is about two inches long; 

 the ground color is dark gray 

 and there are eleven pairs of 

 prominent tubercles on the 

 back. The first five pairs are 

 blue and the last six dark red. 

 There is only one generation 

 a year, the moths appearing 

 the latter part of July. 



The gipsy moth may be 

 controlled in ornamental 

 plantings by spraying the trees 

 with arsenate of lead — five 

 pounds of powder in one 

 hundred gallons of water. The 

 application should be made as 

 soon as the eggs have hatched, 

 more resistant to the poison. 



Gipsy larva {Porthetria dispar). 



as the older caterpillars are 

 Pines are less subject to injury when grown 

 by themselves because the young larvae do 

 not have jaws strong enough to devour the 

 leaves. The removal of deciduous trees from 

 pine groves will make it easier to protect the 

 latter from the ravages of the gipsy moth. 

 In the winter, trees should be examined 

 carefully for egg-masses and the eggs killed 

 by saturating them with crude coal-tar 

 creosote to which a little lampblack has 



9. Gipsy moth. 



