Myzocallis walshii
(Monell, 1879)
Black-bordered oak aphid
Myzocallis walshii is a North American that has established in Europe as an pest of American red oak (Quercus rubra). Native in the northeastern Iberian Peninsula have adapted to this introduced aphid. The species has been recorded across much of North America and has spread to at least 15 European countries.
Pronunciation
How to pronounce Myzocallis walshii: /maɪzoʊˈkælɪs ˈwɔːlʃiaɪ/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
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Habitat
Associated with Quercus rubra (American red oak) in both native and introduced ranges. Specific requirements beyond tree presence have not been documented in available sources.
Distribution
Native to North America: Canada (British Columbia, New Brunswick, Nova Scotia, Ontario, Quebec) and USA (Arkansas, California, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Mississippi, Missouri, Montana, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, Tennessee, Virginia, Washington, Wisconsin). Introduced to Europe: Andorra, Belgium, Czech Republic, France, Germany, Hungary, Italy, Poland, Portugal, Serbia, Slovakia, Slovenia, Spain, Switzerland, UK (England and Wales).
Diet
Phloem-feeding on Quercus rubra (American red oak). Feeding habits on other Quercus have not been documented in available sources.
Host Associations
- Quercus rubra - primary American red oak; sole documented in both native and introduced ranges
Behavior
Expanding geographic range in Europe; has been detected in Catalonia, Andorra, and Navarra in the northeastern Iberian Peninsula.
Ecological Role
Pest of ornamental and nursery trees. Serves as for native Trioxys pallidus and Trioxys tenuicaudus in Europe; this represents the first documented parasitoid association for this in Europe.
Human Relevance
Economic pest of American red oak in nursery and ornamental settings. Management concerns in regions where this oak is cultivated.
Sources and further reading
- BugGuide
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- Myzocallis walshii . [Distribution map].
- Expansion of the aphid Myzocallis (Lineomyzocallis) walshii (Monell) on the red oak Quercus rubra, and adaptation of local parasitoids in the northeastern Iberian Peninsula (Hom., Aphididae, Calaphidinae; Hym., Braconidae, Aphidiinae)
- A SYNOPSIS OF THE WORLD FAUNA OFMYZOCALLIS(HOMOPTERA: APHIDIDAE)