Accidentally imported to Detroit in wooden packing material from China in mid-1990s. Spread by humans – DON’T MOVE FIREWOOD!!! Current map at

Emerald Ash Borer (EAB) Life Cycle Adult (May-July) Prepupa (August-April) Larva (May-November, 4 instars, 1 or 2 years) Egg (May-July) Pupa (April-June) David Cappaert

D. Cappaert, MSU EAB larvae kill ash trees by feeding on phloem tissue beneath the bark, creating galleries which girdle the tree (cut off its ability to transport sugars).

Woodpeckers Asian parasitoid insects North American parasitoid insects Cappaert

 Parasitism is a relationship where one organism benefits at the expense of another organism (usually of a different species).  A parasite is smaller to its host and usually doesn’t kill its host (fleas on a dog)  A parasitoid is similar in size to its host and kills its host (Alien movie)

Atanycolus (North American parasitoid) Photos by David Cappaert

Atanycolus (North American parasitoid) Photos by David Cappaert Parasitoid larva feeds on EAB larva Egg on EAB Female oviposits on EAB through bark Parasitoid finishes feeding then forms cocoon

POP QUIZ  Name the life stages of EAB  Which life stages may be present in the winter?  Name five states where EAB is present  What parts of ash trees do EAB larvae and EAB adults eat?  What organisms prey on EAB?

POP QUIZ - answers  Egg, larva, prepupa, pupa, adult  Larva (two year life cycle) and prepupae  Michigan, Ohio, Indiana, Illinois, Wisconsin, Minnesota, Pennsylvania, West Virginia, Virginia, Missouri, Kentucky, New York  EAB larvae eat phloem, EAB adults eat leaves  Woodpeckers and parasitoid wasps