University of Illinois Extension

University of Illinois Extension

Hort Answers

Browse Plant Pests and Problems

Insect Damage
Ants [Turfgrass]
Ants [Turfgrass]
Formicidae
Insect Damage
Aphids
Aphids
Aphididae
Insect Damage
Aphids [Vegetables]
Aphids [Vegetables]
Aphididae
 
Insect Damage
No Photo
Arborvitae & Juniper Scales
Carulaspis miniena (on Arborvitae) & C. juniperi (on Juniper)
Insect Damage
Asparagus beetle
Asparagus beetle
Crioceris asparagi
Insect Damage
Bagworm
Bagworm
 
Insect Damage
Bark Beetles
Bark Beetles
Insect Damage
Bean Leaf Beetle
Bean Leaf Beetle
Certoma trifurcata
Insect Damage
Black Cutworm
Black Cutworm
Agrotis ipsilon
 
Insect Damage
Black Vine Weevil
Black Vine Weevil
Otiorhynchus sulcatus
Insect Damage
Boxwood Leafminer
Boxwood Leafminer
Monarthropalpus flavus
Insect Damage
Brown Soft Scale
Brown Soft Scale
Coccus hesperidum
 
Insect Damage
Cabbage Looper
Cabbage Looper
Trichoplusia ni
Insect Damage
Colorado Potato Beetle
Colorado Potato Beetle
Leptinotarsa decemlineata
Insect Damage
Columbine Leaf Miner
Columbine Leaf Miner
Phytomyza spp.
 
Insect Damage
Corn Earworm
Corn Earworm
Helicoverpa zea
Insect Damage
Corn Rootworm
Corn Rootworm
Diabrotica virgifera (Western); D. barberi
Insect Damage
Cucumber Beetles
Cucumber Beetles
Acalymma vittatum and Diabrotica undecimpunctata howardi
 
Insect Damage
Diamondback Moth
Diamondback Moth
Plutella xylostella
Insect Damage
Dogwood Borer
Dogwood Borer
Synanthedon scitula
Insect Damage
Eastern Tent Caterpillar
Eastern Tent Caterpillar
Malacosoma americanum
 
Insect Damage
Euonymus Scale
Euonymus Scale
Unaspis euonymi
Insect Damage
European Corn Borer
European Corn Borer
Ostrinia nubilalis
Insect Damage
European Pine Sawfly
European Pine Sawfly
Neodiprion sertifer
 
Insect Damage
European Pine Shoot Moth
European Pine Shoot Moth
Rhyacionia buoliani
Insect Damage
European Pine Shoot Moth & Nantucket Pine Tip Moth
European Pine Shoot Moth & Nantucket Pine Tip Moth
Insect Damage
No Photo
Fall Armyworm
Spodoptera frugiperda
 
Insect Damage
No Photo
False Chinch Bug
Nysius raphanus
Insect Damage
Flea Beetles
Flea Beetles
several genera
Insect Damage
Fungus Gnats
Fungus Gnats
Bradysia species
 
Insect Damage
Gypsy Moth
Gypsy Moth
Lymantria dispar
Insect Damage
Honeysuckle Aphid
Honeysuckle Aphid
Hyadaphis tataricae
Insect Damage
Hornworm
Hornworm
 
Insect Damage
Imported Cabbageworm
Imported Cabbageworm
Insect Damage
No Photo
Imported Crucifer Weevil
Baris lepidii Germar
Insect Damage
Iris Borer
Iris Borer
Macronoctua onusta
 
Insect Damage
Japanese Beetle
Japanese Beetle
Popilla japonica
Insect Damage
Juniper Webworm
Juniper Webworm
Daeborneris marginella
Insect Damage
Leaf Miner on Arborvitae and Junipers
Leaf Miner on Arborvitae and Junipers
Argyresthia cupressella
 
Insect Damage
Leafhoppers
Leafhoppers
Insect Damage
Leafminer
Leafminer
Insect Damage
Leafrollers
Leafrollers
Tortricidae
 
Insect Damage
Lilac Borer, Ash Borer
Lilac Borer, Ash Borer
Podosesia syringe
Insect Damage
No Photo
Lygus Bug
Lygus species.
Insect Damage
Magnolia Scale
Magnolia Scale
Neolecanium cornuparvum
 
Insect Damage
Meadow Spittlebug
Meadow Spittlebug
Philaenus spumarius
Insect Damage
Mealybug
Mealybug
Pseudococcidae
Insect Damage
No Photo
Nantucket Pine Tip Moth
Rhyacionia frustrana
 
Insect Damage
Northern Pine Weevil
Northern Pine Weevil
Pissodes approximatus
Insect Damage
Oystershell Scale
Oystershell Scale
Lepidosaphes ulmi
Insect Damage
Pales Weevil
Pales Weevil
Hylobius pales
 
Insect Damage
Picnic Beetles
Picnic Beetles
Insect Damage
Pine Bark Adelgid
Pine Bark Adelgid
Pineus strobi
Insect Damage
Pine Needle Scale
Pine Needle Scale
Phenacaspis pinifoliae
 
Insect Damage
Pine Root Collar Weevil
Pine Root Collar Weevil
Hylobius radicis
Insect Damage
Pine Sawfly
Pine Sawfly
Neodiprion lecontei
Insect Damage
Pine Tortoise Scale
Pine Tortoise Scale
Toumeyella parvicrnis
 
Insect Damage
Pitch Mass Borer
Pitch Mass Borer
Synanthedon pini
Insect Damage
No Photo
Potato Leafhopper [Vegetables]
Empoasca fabae
Insect Damage
Potato Leafhopper [Woody Ornamentals]
Potato Leafhopper [Woody Ornamentals]
Empoasca fabae
 
Insect Damage
Root Maggots
Root Maggots
Insect Damage
Shot Hole Borer & Other Bark Beetles
Shot Hole Borer & Other Bark Beetles
Scolytidae
Insect Damage
Sod Webworms [Turfgrass]
Sod Webworms [Turfgrass]
Crambus spp. and other Pyralidae
 
Insect Damage
Spirea Aphid
Spirea Aphid
Aphis citricola
Insect Damage
Spruce Bud Scale
Spruce Bud Scale
Physokermes piceae
Insect Damage
Spruce Gall Adelgids
Spruce Gall Adelgids
Adelges cooleyi, Adelges abietis
 
Insect Damage
No Photo
Spruce Needle Miner
Endothenia albolineana
Insect Damage
Squash Bug
Squash Bug
Anasa tristis
Insect Damage
Squash Vine Borer
Squash Vine Borer
Melittia cucurbitae
 
Insect Damage
Stink Bug
Stink Bug
Several genera and species
Insect Damage
Thrips
Thrips
Many
Insect Damage
Twomarked Treehopper
Twomarked Treehopper
Enchenopa binotata
 
Insect Damage
Uglynest Caterpillar
Uglynest Caterpillar
Archips cerasivorana
Insect Damage
Western Corn Rootworm
Western Corn Rootworm
Insect Damage
White Grubs [Turfgrass]
White Grubs [Turfgrass]
Ataenius spretulus, Popilla japonica, Cyclocephala spp., Phyllophaga spp.
 
Insect Damage
Whitefly
Whitefly
Insect Damage
Winged Euonymous Scale
Winged Euonymous Scale
Lepidosaphes yanagicola
Insect Damage
Yellownecked Caterpillar
Yellownecked Caterpillar
Datana ministra
 
Insect Damage
Zimmerman Pine Moth
Zimmerman Pine Moth
Dioryctria zimmermani