Specimen
Adult Gypsy Moths
Specimen
Aesculus leaf blotch (Guignardia aesculi) on Aesculus flava Sol. (yellow buckeye)September 9 1997
Danielson, Donna
Specimen
Aesculus leafminer (Unknown insect) on Aesculus glabra Willd. (Ohio buckeye)June 17 1998
Danielson, Donna
Specimen
Ailanthus webworm (Atteva punctella) on Ailanthus altissima (Mill.) Swingle (tree of heaven)August 20 1997
Miller, Fredric D.
Specimen
Alder Leafminer
Specimen
Alder leafminer (Fenusa dohrnii) on Alnus glutinosa (L.) Gaertn. (European black alder)June 4 1997
Danielson, Donna
Specimen
Aphids (honeydew and sooty mold) (Undetermined aphids) on Quercus rubra L. (northern red oak)July 21 1998
Lewis, Tim
Specimen
Apple Flea Weevil
Specimen
Apple Flea Weevil
Specimen
Apple Flea Weevil
Specimen
Apple Flea Weevil
Specimen
Arborvitae leafminer (Argyresthia thuiella) on Thuja occidentalis L. (eastern arborvitae)March 27 2000
Danielson, Donna
Specimen
Armillaria root rot
Specimen
Armillaria root rot (Armillaria) on Quercus rubra L. (northern red oak)October 13 1995
Jacobs, Karel
Specimen
Ascochyta blight (Ascochyta syringae) on Syringa vulgaris L. (common lilac)May 1 1998
Danielson, Donna
Specimen
Ash anthracnose (Gloeosporium aridum) on Fraxinus pennsylvanica ‘Patmore’ (Patmore green ash)July 10 2002
Danielson, Donna
Specimen
Ash midrib gall (Contarinia canadensis) on Fraxinus pennsylvanica (Green ash)June 4 1997
Danielson, Donna
Specimen
Ash plant bug (Tropidosteptes amoemus) on Fraxinus mandshurica Rupr. (Manchurian ash)June 4 1997
Danielson, Donna
Specimen
Asian Longhorned beetle
Specimen
Asian longhorned beetle (Anoplophora glabripennis) on Acer saccharinum L. (silver maple)August 11 1998
Danielson, Donna, Jacobs, Karel, Wiegrefe, Sue
Specimen
Azalea bark scale (Eriococcus azaleae) on Rhododendron mucronulatum Turcz. (Korean rhododendron)May 25 2000
Bell, Lisa
Specimen
Azalea sawfly (Mematus lipovskyi) on Rhododendron calendulaceum f. aurantium (Flame azalea)May 20 1998
Danielson, Donna
Specimen
Bacterial blight of lilac (Pseudomonas syrinae) on Syringa vulgaris L. (common lilac)May 4 2000
Jacobs, Karel, Danielson, Donna
Specimen
Bacterial leaf scorch (Xylella fastidiosa) on Quercus rubra L. (northern red oak)October 2 2000
Specimen
Bark beetles (Dendroctonus spp.) on Pseudotsuga menziesii ‘Glauca’ (Blue Douglas Fir)July 17 1997
Danielson, Donna
Document
Bark Damage on Swamp White and Bur Oaks in Northeastern Illinois: A Report on a New Plant Health IssueMarch 19 2024
Adams, Stephanie
Specimen
Birch leafminer (Fenusa pusilla) on Betula papyrifera Marsh. (paper birch)July 30 1997
Danielson, Donna
Specimen
Black pine needle scale (Nuculaspis califormica) on Pinus mugo var. rostrata (Ant.) Hoopes (Beaked mugo pine)April 16 1997
Danielson, Donna, Jacobs, Karel, Miller, Fredric D.
Specimen
Black rot of grapevine (Guignardia bidwellii) on Vitis amurensis Rupr. (Amur grape)June 1 1999
Danielson, Donna