Clues to the
ASH
TREES
DECLINE

David L. Roberts, Ph.D.
Senior Academic Specialist
Michigan State University


EAB feeding
Page -2- Pictorial Emerald Ash Borer
& Ash in Decline
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    Adult Emerald ash borer, EAB feeding on ash leaf. (Fig. 16). To view a close-up, click here (Fig. 16a)

 17 Images Loading:
EAB moving
 Adult EAB crawling across a wedge of ash just after it emerged. (Fig 17.)
adults mate and egg laying bark splits on trunk
Adults mating (inset) and female EAB moves to lay eggs in bark crevices.  (Fig. 18)   Additional photos, click here (Fig 18a.)   Bark splits (lower) indicates EAB larval feeding beneath.  Upper split is a more advanced stage. (Fig.19) 
tunneling bark exposure tunneling revealed
 Tunneling from EAB larvae in 2001 (upper left side) and in 2000 (darker right front). See trunk view and comments continued on Fig. 21.  (Fig. 20)  Close up of tunneling from EAB larval damage. Photo was taken in June 2002, but the damage occured in the late summer of 2001. Note older damage (canker) to the right; this injury probably occurred in 2000 and has now been discolored by invasion by secondary fungi. (Fig. 21)
Dr. Smitley snaps tree cankers canker like scars
 Colleague Dr. David Smitley, Michigan State University entomologist, taking a picture of damaged ash trees. 
(Fig. 22)
Two canker-like scars produced by EAB larvae feeding beneath the bark. Affected trees are frequently attacked numerous times in this manner and may succumb to the injury in 2-3 years.(Fig. 23)
rossette or witches broom epicormic shoots
 A rossette or witches broom on ash caused by the ash yellows phytoplasma. Ash trees affected by ash yellows develop this classical dense, highly branched but stunted shoots and foliage which is distinctly different from the lush, large shoots on trees affected by EAB. (Fig. 24)  Abundant epicormic shoots often develop on the trunks of EAB-affected trees. Shoots often grow 4-5 feet in several weeks and are lush and have abnormally large foliage.  (Fig. 25)
trunk shoots suckering and dieback
  Abundant epicormic shoots from the trunk.  Also note the proliferation of shoots at the base of the tree; these shoots have been continually mowed with the turf. (Fig. 26)   Dense suckering (epicormic shoots) on the trunk and dieback is a common progression in EAB affected trees.   (Fig. 27)
damaged trunk damage to trunk
   Signs of EAB larval damage includes rough or cracked bark. Peeling back the bark in EAB affected trees reveals the tell-tale tunneling observed in Fig.20-23  (Fig. 28)   D-shaped exit holes created by adult EAB which emerged in late May until the end of June in 2002.
 (Fig. 29)
row of dying trees typical neighborhood streets
  Driving along Midwestern roads often reveals many elms which have died from Dutch Elm Disease. However, these trees are ash which have died from the EAB in Southeast Michigan.  (Fig. 30)  During the 60's, 70's and 80's, many communities which lost 1000's of street elms replanted with ash. Most of these ash on this street are now succumbing to the EAB. Diversity in tree species is the key to preventing such catastrophies. (Fig. 31)
diseased ash trees Canada river park diseased ash trees
  EAB damage on ash in Windsor, Canada. This view looks across the river to Detroit, Michigan with the
Ambassador bridge in the background. (Fig. 32)
  Another view from Windsor, Canada looking across the river to dowtown Detroit, Michigan. Trees on the right show typical symptoms of EAB.  (Fig. 33)
Canadian Ash Rescue Rangers Photos left: Canadians, Sobrina, Grade 5 (left) and Kailey, Grade 6 (right) are two members of the "ARC Rangers" who plan to inform their classmates and the public about this ash insect menace.  They are wearing the ARC designed t-shirts and came to the recent EAB public discussion/meeting held in LaSalle, Ontario Nov. 13, 2002.  Talk about outstanding youth environmental involvement!
   The meeting was enlightening in discovering what each country is doing, exchange of ideas for addressing this serious EAB threat and public concerns about the EAB.
posted: 11/22/02 (Fig. 34)
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logoMSU
   David L. Roberts, Ph.D., Senior Academic Specialist
   Michigan State University
   College of Agriculture and Natural Resources

   173 Giltner Hall, East Lansing, MI  48824-1101
  Cell Ph: (248) 320-7124 preferred
  Lab Ph: (517) 355-4518

  Email: robertsd@msu.edu  with any comments or questions.



 

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