V7 TWO DEST RU GIA OG EAaias 
INSECTS.* 
Vi oH» Low® 
SUMMARY. 
The apple tree tent caterpillar has been unusually abundant 
throughout the State during the past season. Although it feeds 
readily upon a variety of fruit and other trees it has been espe- 
cially injurious to the apple. 
The eggs are laid in July in conspicuous brown rings or masses 
about the smaller twigs. The caterpillars are formed in the eggs 
by fall, but do not leave them until early the following spring. 
They feed upon the leaves. The caterpillars from each egg mass 
unite in spinning a tent among the smaller branches in which they 
remain except while feeding. They are full grown in about five 
or six weeks and spin their cocoons in any convenient place. The 
adults are brown moths conspicuously marked with two parallel 
oblique lines of white on the fore wings. 
The egg masses may be easily gathered and destroyed during the 
winter. The caterpillars may also be destroyed while congre- 
gated in the nests or by an arsenical spray. 
The spraying experiments with Paris green, green arsenite and 
arsenite of lime indicate that the two last named are equally ef- 
fective, when properly applied, as a poison for the apple tree tent 
caterpillar and canker worms. ‘Their principal advantages over 
Paris green lie in their cheapness and the fact that they will re- 
main suspended in water much longer. 

* Reprint of Bulletin No. 152. 
