Aphis illinoisensis

Small, soft-bodied aphid with pear-shaped body typical of the genus Aphis. Coloration not explicitly described in available sources; likely pale green to yellowish based on related grape-feeding aphids. Distinguished from other vineyard aphids by host association with Vitis species and documented vector status for GVCV. Cornicles (abdominal siphunculi) present as paired tubular structures. Identification to species level requires examination of morphological characters including cauda shape and antennal tubercle development; molecular confirmation may be necessary where sympatric with congeners.

Agricultural and natural habitats supporting Vitaceae. Primary habitat includes cultivated vineyards (Vitis vinifera) and native wild grape populations. Overwinters on Viburnum species (blackhaw), establishing an obligate host alternation between winter and summer hosts. Documented in rangeland-adjacent environments where wild Vitaceae occur.

Native to North America: documented across eastern and central United States (Connecticut, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Montana, New Jersey, New York, North Carolina, Tennessee, Texas, Utah, Virginia, Wisconsin) and southern Canada (Ontario, Quebec). Invasive in Mediterranean region: Greece (including Crete), Cyprus, Malta, Italy (Sicily), Montenegro, Spain, Turkey, Israel. North Africa: Algeria, Libya, Tunisia. Central America and Caribbean: Belize, Costa Rica, Cuba, Dominican Republic, El Salvador, Guadeloupe, Haiti, Honduras, Jamaica, Panama, Puerto Rico. South America: Argentina, Brazil (São Paulo), Chile, Colombia, Uruguay, Venezuela.

Phloem sap feeder specialized on Vitaceae. Documented hosts include cultivated grapevine (Vitis vinifera) and native North American Vitis species. Overwintering host: Viburnum species (blackhaw).

• Vitis vinifera - primary host (summer)cultivated grapevine, main economic host
• Vitis spp. - native hostwild grape species in North America
• Ampelopsis cordata - native hostdocumented GVCV reservoir host
• Viburnum sp. - overwintering hostblackhaw, winter host for egg-laying

Holocyclic with obligate host alternation. Overwinters as eggs on Viburnum (blackhaw). Spring migration to grapevine (Vitis) where parthenogenetic reproduction occurs through summer. Multiple parthenogenetic generations on grapevine produce live young (viviparity). Autumn return migration to Viburnum for sexual reproduction and egg deposition.

Forms colonies on stems and leaves of host plants. Exhibits typical aphid sedentary feeding behavior with piercing-sucking mouthparts. Documented dispersal capability enables movement between wild and cultivated Vitaceae, facilitating virus transmission. Winged morphs (alates) produced for migration between primary and secondary hosts.

Agricultural pest of grape production. Documented vector of Grapevine vein clearing virus (GVCV), contributing to viral epidemiology in wild and cultivated grape populations. Serves as host for parasitoid wasps (Aphidius matricariae, Aphidius colemani, Lysiphlebus testaceipes) and entomopathogenic bacteria, supporting biological control food webs.

Significant economic pest of viticulture due to direct feeding damage and virus transmission. Subject to USDA-APHIS monitoring as part of invasive species management. Target of biological control programs using parasitoids and entomopathogenic bacteria (Lysinibacillus xylanilyticus, Serratia liquefaciens, Stenotrophomonas tumulicola, Pseudochrobactrum saccharolyticum). Quarantine significance in regions where expanding distribution threatens grape industries.

• Aphis neriiBoth are brightly colored aphids with orange and black markings feeding on milkweeds and related plants; A. illinoisensis is distinguished by association with Vitaceae rather than Apocynaceae and lacks the distinctive orange-black aposematic coloration of oleander aphid.
• Aphis punicaeSympatric in some regions and both subject to similar biocontrol research; distinguished by host association (Punica granatum vs. Vitis) and morphological characters requiring microscopic examination.

• aphid
• grape pest
• invasive species
• virus vector
• GVCV
• biocontrol target
• Vitaceae
• holocyclic
• host alternation

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Incredible Work, and Timely, on 22 Species of Hornets | Bug Squad
• It Takes a Village: Our Continued Efforts to Manage Invasive Species in the U.S.
• Orange and Black II: Milkweed leaf beetle, Labidomera clivicollis; Oleander aphid, Aphis nerii; Milkweed Bug, Oncopeltus fasciatus; Monarch, Danaus plexippus — Bug of the Week
• Orange and Black Bugs- Milkweed leaf beetle, Labidomera clivicollis; Oleander aphid, Aphis nerii; Milkweed Bug - Oncopeltus fasciatus; Monarch butterfly, Danaus plexippus — Bug of the Week
• Got Spotted Lanternfly Eggs? Send 'Em Through the Wood Chipper
• New Research Advances Efforts to Predict Rangeland Grasshopper Outbreaks
• Aphis illinoisensis . [Distribution map].
• Aphis illinoisensis . [Distribution map].
• Identification and environment-friendly biocontrol potential of five different bacteria against Aphis punicae and Aphis illinoisensis (Hemiptera: Aphididae)
• First record of the grapevine aphid, Aphis illinoisensis Shimer, in Tunisia
• Review of invasive grapevine aphid, Aphis illinoisensis Shimer, and native parasitoids in the Mediterranean (Hemiptera, Aphididae; Hymenoptera, Braconidae, Aphidiinae)
• Grapevine vein clearing virus Is Prevalent and Genetically Variable in Grape Aphid (Aphis illinoisensis Shimer) Populations