Don’t Lose Your Leaves & Trees to These Caterpillars

This insect is a moth and a pest on ornamental ash trees, principally Green and Manchurian Ash.

The early stages of the caterpillar feed within the leaf tissue. As the caterpillar grows, it emerges from the leaf, migrates to a new leaf and rolls the leaf into a characteristic cone shape. The larva will continue to feed within this enclosure until the pupal stage. Larvae feed until mid or late June, and the adult moths will emerge from the leaf cone starting about mid-July.

Although the insect can be quite prevalent on individual trees, the damage is minor and does not interfere with overall tree health. The rolled leaves remain attached to the tree and actual leaf damage is minimal.

Since the insect in the caterpillar stage is completely enclosed, an insecticidal spray program is largely ineffective. Contact us today.

Source: City of Calgary