Photo by Eric LaGasa, Washington State Dept. of Agriculture, Bugwood.org
The Cherry Ermine Moth (Yponomeuta padellus) feeds on cherry, hawthorn, plum, mountain-ash and other related trees. Larvae defoliate trees. Surveys are conducted because of the presence of potential host material in Wyoming and potential introduction pathways from surrounding states. In the US, the Cherry Ermine Moth has been found in Washington and Oregon. To date, it has not been found in Wyoming. Seventy-five total traps have been placed throughout twenty-three counties in Wyoming.
The Wyoming Cherry Ermine Moth Survey is conducted by the Wyoming Pest Detection / CAPS Program. A sticky trap with pheromone attractant is placed on or near the host plant from May until August. The traps are monitored for suspects and serviced once a month. If suspects are found they are sent to the University of Wyoming for further identification.