Eric LaGasa, Washington State Department of Agriculture,

Cherry bark Tortrix

Enarmonia formosana

Cherry bark Tortrix (Enarmonia formosana) is an insect pest. It is a native of Eurasia and Africa and was first detected in Washington State in 1991.

Infestations are easily recognized by reddish-orange colored frass accumulations or frass tubes near gallery entrances. Larvae damage trees by direct feeding which reduces or excludes transportation of nutrients to the roots. Indirect damage occurs through the formation of habitats for secondary pests such as bark beetles, fungi, and increasing susceptibility of infested trees to successive years of freezing damage, which can result in the death of the tree. .

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