Agromyza ambigua Fallén, 1823

mine

The shallow, whtish mine starts (not very close to the base of the lamina) as a fine ascending corridor. This is overrun when the direction alternates, and the mine quickly widens. The final mine is characteristically short; often not the full width of the leaf is used. Frass in big black grains, never greenish. Pupation outside the mine.

hostplants

Poaceae

Avena sativa; Dactylis; Hordeum murinum, vulgare & subsp. distichon; Secale cereale; Triticum aestivum.

Reported from Phleum pratense by Huber (1969a), but this has not been confirmed by breeding.

phenology

Larvae in June (Hering, 1957a). One generation only (Venturi, 1934a; Hering, 1957a).

BENELUX

BE not recorded (Fauna Europaea, 2007).

NE observed (de Meijere, 1924a).

LUX not recorded (Fauna Europaea, 2007).

distribution within Europe

From Scandinavia to the Iberian Peninsula and Italy, and from Britain to Serbia (Fauna Europaea, 2007).

larva

The mandible with two normal teeth, and a smaller additional basal one (Hering, 1953a). The girdles of fine spinulation along the anterior and posterior margins of the segments normal, i.e., relatively narrow, nowhere fusing together (unlike in A. nigrociliata). Rear spiracula far apart, each with 3 papillae. Behind the mandibles ventrally a median field with fine spines (character of the Agromyza ambigua group of Griffiths, 1963a).

The larva is also described and illustrated by Beri (1971c), based on material from India, living on a Setaria species. However, he describes the left mandible as having 2, the right one 1 tooth, which makes it questionable if he had the European species in front of him.

puparium

Yellowish brown (Spencer, 1973b).

synonyms

Domomyza ambigua; Agromyza heteroptera (Loew, 1858); A. niveipennis Zetterstedt, 1848 (but ‘niveipennis’ in de Meijere, 1943 refers to A. nigrociliata Hendel, 1931 [Hering, 1953a]).

notes

Mines particularly in the uppermost (youngest) leaves of the plant (Hering, 1957a).

The description by Venturi (1939a) of the biology of this species (as niveipennis) probably refers to Pseudonapomyza atra (Spencer, 1973b).

Spadic (1991a) records serious damage to wheat and barley in Serbia, but his description of the mine suggests that his identification was not correct.

references

Beiger (1955a, 1960a, 1989a), Benavent, Martínez, Moreno & Jiménez (2004a), Beri (1971c), Beuk (2002a), Bland (1994c), Černý & Merz (2007a), Černý & Vála (1996a, 1999a), Ci̇velek, Çikman & Dursun (2008a), Dempewolf (2004a), van Frankenhuyzen Houtman & Kabos (1982a), Gallo (1996a), Griffiths (1963a), Hering (1925a, 1943a, 1953a, 1956a, 1957a, 1962a), Huber (1969a), Kabos (1971a), de Meijere (1924a, 1939a), Papp & Černý (2015a), Parmenter (1949a), Skala & Zavřel (1945a), Sønderup (1949a), Spadic (1991a), Spencer (1972a, 1973b, 1976a), Süss (1982a), von Tschirnhaus (1999a), Venturi (1934a, 1939a).

27/04/2017

mod 25.xi.2017