Agromyza ambigua Fallén, 1823
IMPORTANT CHARACTERS
Adults
Wing length: 2.5 - 3 mm. Genae light brown, concolorous with frons between dc. Frons clearly dark at sides and perhaps in alcohol specimens light brown in the central region. Third antennal segment angulate.
Dorsocentral bristles: 3-4, gradually increasing in size; the first one only slightly longer than acrostichals.
Immature stages
As in most grass feeding Agromyza, posterior spiracles have three openings each. Two mouth hooks on each mandible (de Meijere, 1925).
BIONOMICS
Leaf miner.
HOST PLANTS
Poaceae, of these some grains: Avena sativa (oats), Hordeum vulgare (barley), Secale cereale (rye), Triticum aestivum (wheat). Usually the grass feeders are not extremely specific in their host plant choice.
DISTRIBUTION
Europe, USA, Canada.
ECONOMIC IMPORTANCE
Together with other grass mining agromyzids Agromyza ambigua can reach higher infestation levels and may cause yield loss. However, the significance of Agromyza ambigua within the grass feeding leaf miner complex is not fully understood.