The presence of the eastern tent caterpillar is objectionable more from
an aesthetic standpoint than from its effect on the host tree. The ugly
tents constructed by the feeding larvae make this pest highly
objectionable on shade trees. Black cherry and other species of the
genus _Prunus_ are preferred hosts, but other trees in the family
_Rosaceae_ are sometimes attacked. This insect is widely distributed
wherever host trees are found east of the Rocky Mountains.
[Illustration: Larvae and tent of eastern tent caterpillar.]
The caterpillars appear at about the same time the leaves of black
cherry begin to unfold. The larvae construct a web or tent in the crotch
of a small branch, and begin feeding. Usually they consume entire
leaves, except for the large veins. As the larvae mature, they add to
the tent, which may reach a foot in diameter and two feet in length.
Reaching maturity in about six weeks, the larvae drop to the ground and
pupate. The moths emerge in June and the females lay eggs. Eggs of the
eastern tent caterpillar are shiny black masses which encircle the
smaller twigs and are quite noticeable. The insect overwinters in the
egg stage.
Control on ornamental, fruit, and shade trees is achieved by pruning off
and burning the tents containing the caterpillars.
[Illustration: Tent caterpillar-infested black cherry.]