Issue 8, June 15, 2015

Invasive Species Updates

Viburnum Leaf Beetle. Reports continue to come in regarding viburnum leaf feeding injury. Our first report came out of Lake County this week. This marks the third known infested county in the state. We encourage homeowners to be vigilant and if they notice leaf feeding on their viburnum to please let us know, particularly if they are outside of the Cook, DuPage, and Lake counties. More information can be found on viburnum leaf beetle in this previous HYG article:

Emerald Ash Borer.  Much of Illinois has reached or will be nearing the time of peak activity for emerald ash borer. Emerald ash borer adults have been reported flying throughout most of the state (where confirmed). As a reminder, below is the quarantine map that restricts the movement of ash and ash products. Also indicated on the map are the confirmed locations of emerald ash borer in Illinois.

Symptoms on trees include: dieback of the tree, wilting and yellow of the foliage, and presence of D-shaped exit holes where adults have emerged from the tree. Trees may also have the presence of epicormics shoots at the base of the tree.

EAB infested tree, Champaign, 2015.

EAB adult on leaf, Champaign, 2015.

Gypsy Moth.  Trapping for gypsy moth is in full swing across the state. USDA-APHIS-PPQ and Illinois Department of Agriculture trappers are placing traps throughout the state. As you are driving you might notice some of these traps located in your area.

Traps placed in the southern 2/3 of the state (detection area) will be green or brown delta traps.

Milk carton traps may be found in the higher gypsy moth populated areas (northern part of the state).

In areas where gypsy moth is present, caterpillars are active. Generally, gypsy moth caterpillars will reach their last larval stage and begin pupating in late June and early July, with adults emerging in July and August ( 

Gypsy moth caterpillar feeding on leaf.

(Kelly Estes)

Kelly Estes

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