New York Agricultukal Experiment Station. 407 



■* 

 are steel-colored beetles, flattened above and with irregular depres- 

 sions on the wing covers. 



Treatment. — The trees should be examined at least once a year 

 and the borers dug out with a knife or killed by inserting a flexi- 

 ble wire into the burrows. 



THE ROUND-HEADED APPLE-TREE BORER. 



{Saperda Candida Fab.) 



Description. — The life-history of this species is similar to that 

 of the preceding except that the grub requires but about a year to 

 reach full growth. In both the grub and adult stages the body 

 is more nearly cylindrical in outline. The adult is prominently 

 marked by two broad, nearly parallel, white lines extending the 

 full length of the body. 



Treatment. — The same as for the preceding species. 



LEAF-EATING INSECTS. 

 THE APPLE-TREE TENT CATERPILLAR. 



(Clisiocampa americana Harr.) 



Description. — This tent caterpillar feeds upon a variety of fruit 

 and other trees and is especially injurious to the apple. The eggs 

 are laid in July in conspicuous brown rings or masses about the 

 smaller twigs. The caterpillar is developed in the egg in the fall 

 but does not emerge from the egg shell till early in the following 

 spring. The caterpillars from each egg mass form a colony and 

 spin a tent in which they stay when they are not feeding on the 

 leaves of the tree. 



After they are full grown, that is about five or six weeks after 

 hatching, they spin their cocoons. The adults, which are bro^^^l 

 moths, with two, oblique, parallel white lines on the fore wings, 

 emerge in the latter part of June or early in July. 



Treatment. — The egg masses may easily be gathered in winter 

 and burned. The caterpillars may be destroyed while in their 



