Photo by Ian F. Smith, Bugwood.org
The Apple Ermine Moth (Yponomeuta malinellus) attacks apple and crabapple. Surveys are conducted because of the presence of potential host material in Wyoming, potential introduction pathways from surrounding states, and the ability of this pest to be transported in nursery stock. It has been found in the US in Washington and Oregon. To date, it has not been found in Wyoming. Eighty-four total traps have been placed throughout twenty-three counties in Wyoming.
The Wyoming Apple 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.