Proposed Btk Bacillus thuringeniensis kurstaki (Btk) is a bacterium that is toxic only to caterpillars. Btk does not adversely affect adult moths and , nor does it adversely affect other application or any organisms that consume the caterpillars. January February March April May June July August September October November December

Asian Gypsy Moth eggs young larvae older larvae pupae adult eggs Lymantria dispar asiatica

Western Tiger Swallowtail pupae adults and larvae (multiple broods) pupae Papilio rutulus

White-Lined Sphinx pupae adult eggs larvae adult eggs larvae pupae Hyles lineata

Polyphemus Moth pupae adult eggs larvae pupae Antheraea polyphemus

Monarch adult adults and larvae (one or two broods) adult Danaus plexippus

Red Admiral pupae adults and larvae (multiple broods) pupae atalanta

Western Skipper young larvae older larvae pupae adult eggs young larvae Ochlodes sylvanoides

Gray Hairstreak pupae adults and larvae (multiple broods) pupae Strymon melinus

Mourningcloak adult eggs larvae pupae adult

Pepper Moth pupae adult eggs larvae pupae Biston betularia

Garden Tiger Moth larvae pupae adult eggs larvae Arctia caja

Oblique-Banded Leafroller pupae adult eggs larvae adult eggs larvae pupae Choristoneura rosaceana

Thallophaga taylorata pupae adult eggs larvae pupae

Photo credits: Thomas Shahan, Brocken Inaglory, Didier Descouens, Fir0002, HaarFager, Phenology of Butterflies and Moths in Oregon John Flannery, Joseph Berger, Andy Reago, Chrissy McClarren, Chris Hedstrom in relation to Asian Gypsy Moth eradication efforts

Created by Chris Hedstrom, February 2016