V. TWO DESTRUCTIVE ORCHARD 



INSECTS.* 



V. IT. Lowe. 



SUMMARY. 



The apple tree tent caterpillar lias 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 experirhents 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. 



