....has been found in St. Paul, MN.

If you suspect a possible EAB infestation contact an ISA certified arborist and or the MDA at  "Arrest the Pest" Hotline 651-201-6684 - Metro Area

Symptoms  

Symptoms of early infestations may be difficult to diagnoseAs infestation progresses, small vertical splits in the bark can be seen on twigs or trunk Typically the top 1/3 of crown dies first and works its way down the tree

• Trees appear to lose about 30%-50% of their canopy after 2 years of infestation.
• Trees may die after 2-4 years or less (small trees)

As the top of the tree continues to decline epicormic shoots form

• Epicormic shoots can arise at the interface between healthy and dead tissue anywhere in the canopy

Be on the look-out for multiple declining ash in a given area Sapsucker holes and flaking of outer bark near sapsucker holes can be used to detect EAB in early stagesDistinct “S” shaped frass filled larval galleries that score the outer sapwood and phloem underneath the bark

• Galleries in an affected area can range from 4-20 inches in length
• Galleries from an individual larvae become progressively wider as the larvae grows

D-shaped exit holes

• (generally present after an infestation has been present for 1 yr. or more)
• Approximately 1/8 inch in diameter

Dense root sprouting may occur after death of a treeLeaf symptoms from adult feeding is usually displayed in small irregular shaped patches along the leaf margins 

Signs of EAB

Adults

Usually bronze or golden green with dark metallic emerald green wing covers·

Adults are slender and can be 1/4 inch to 1/2 inch in length· 

Top of the abdomen under the wings is metallic purplish red (seen when wings are spread)·

Adults may be difficult to detect even in areas of high infestation

Short period of activity (3-6 wks of activity)

Generally active during the day (sunny and warm days)

Adults will hang out in bark crevices or on foliage during rain, heavy cloud cover, high winds, or when temps reach above 90 F. 

Larvae

Slender, flattened, segmented (10 total abdomen segments) cream colored larvae with a brown head can be found by peeling back loose bark on infested treesLarvae range in size from 1 -1 1/4 inches in lengthPincer-like appendage on the last segment

Larvae hatch from eggs deposited in bark crevices

This information has been provided by Rainbow Treecare.

More resources:

http://www.mda.state.mn.us/plants/pestmanagement/eab.htm

http://www.dnr.state.mn.us/invasives/terrestrialanimals/eab/index.html