Agromyza parvicornis Loew, 1869
IMPORTANT CHARACTERS (Spencer, 1973)
Adults
Wing length: 2.5 - 3.1 mm. Pale antennae, shining black mesonotum, costa extending to vein M1+2; pale squamal fringe.
Male terminalia
Genitalia distinctive, distiphallus rather short, shown in (Ag parvicornis aedeagus.pct, Ag parvicornis aedeagus Sp.pct).
BIONOMICS
Leaf miner causes full depth mines especially in young leaves.
HOST PLANTS
Zea mays L., Panicum miliaceum L. (millet) and probably other cultivated and wild grasses.
DISTRIBUTION
Widespread in North America, records from USA (Florida, Texas, Washington, Utah, Wisconsin); Canada (British Columbia, Ontario).
ECONOMIC IMPORTANCE
In his literature review Spencer, 1973 concluded the species were in the past a periodical pest in restricted localities and a potential pest, mainly on maize. However, in most cases parvicornis is kept in check by numerous parasitoids.