Forda marginata Koch, 1857
crusty pistachio-grass root aphid
on Pistacia, primary host plant

Pistacia terebinthus, Spain, prov. Léon, San Juan de Paluezas © Nicolás Pérez
gall
There are two types of galls.The fundatrix lives in a small open gall at the top of a leaflet, generally the odd leaflet of the leaf. Her offspring lives in a reddish, tubular upwards rolling of the leaf margin.
host plants
Anacardiaceae, narrowly monophagous
Pistacia atlantica & subsp. mutica, khinjuk, terebinthus & subsp. palaestina.
Houard also mentions P. vera.
on Poaceae, secondary host plants
Ochlopoa annua, UK © Bob Dransfield & Bob Brightwell, InfluentialPoints
gall
Aphids at the roots.
host plants
Poaceae, oligophagous
“Agropyron“; Agrostis capillaris; Arrhenatherum elatius; Avena; Bromus; Corynephorus canescens; Dactylis, Elytrigia repens; Festuca; Hordeum vulgare; Lolium; Ochlopoa annua; Piptatherum miliaceum; Poa; Secale; Triticum.
synonym
Pemphigus follicularius Passerini, 1861; Forda follicularia; Tetraneura follicularia; Paracletus, Pemphigus, retroflexus Courchet, 1879.
inquilines
See Istrianis femoralis.
notes
In more northern parts of Europe, where the primary hosts do not occur, the species may live without host alternation on grasses. The aphids on their secondary host plants have a strong association with ants; they also hibernate in ants’ nests.
references
Barbagallo & Massimino Cocuzza (2014a), Barbagallo & Pollini (2014a), Béguinot (2003a), Blackman & Eastop (2014), Buga, Zhorov, Leshchinskaya & Stekolshchikov (2016a), Cogolludo (1921a), Danielsson (1974a), Dauphin & Aniotsbehere (1997a), Eklo & Hofsvang (2008a), Heie (1980a), Houard (1909a), Inbar, Wink & Wool (2004a), Krzywiec (1982a), Lampel & Meier (2003a), Nieto Nafría & de Benito Dorrego (1976a), Nieto Nafría, Mier Durante, Binazzi & Pérez Hidalgo (2002a), Osiadacz & Wojciechowski (2008a), Pérez Hidalgo, Martínez Peláez & Nieto Nafría (2001a), Roberti (1983a), Salas-Remón, Llimona, Lozano ao (2015a), Schimitschek (1939a), Suay Cano & González Funes (1998c), Tavares (1905a), Tomasi (2014a), Wojciechowski, Depa, Halgoš ao (2016a), Wool & Kurzfeld-Zexer (2008a).