Lasioptera populnea Wachtl, 1883

on Populus

Lasioptera populna: gall on Populus alba

Populus alba, Hungary, Mosonmagyaróvár © László Érsek

Lasioptera populna: gall on Populus alba

concentration of (fused) galls near the leaf base

Lasioptera populna: opened gall with larvae

as this section shows, the mine protrudes at upperside and underside of the leaf to the same degree

_3449_83Lasioptera populnea: larva

two larvae. According to Dr. Skuhravá the left one belongs to Contarinia populi; see the note below.

Lasioptera populna: galls drawn by Wachtl

drawing by Wachtl, the author of the species (from Wachtl, 1886a)

gall

± smooth, unilocular swelling of the lamina, equally protruding at both sides; often several galls fused near tha base of the leaf. Larva solitary, orange, not jumping. Univoltine, pupation in the soil.

hostplants

Salicaceae, monophagous

Populus alba, x canescens, tremula.

“inner gall”

according to the description by Wachtl, the gall has an inner gall – a phenomenon common in gall wasps, unique among gall midges. Below the, perhaps somewhat diagrammatic, illustration given by him. The two lower pictures showing hand-section made by László confirm the impression that the inner gall is funnel-shaped and open above. That is in agreement with the many upper-surface openings in the -still occupied- galls in the pictures and in the drawing. Actually the larva does not live in the funnel but around it. The way the funnel evolves, and it’s function, are unclear; probably the oviposition plays a central role.

Lasioptera populnea, section through the galls

section through some gall, showing the inner gall Wachtl (1886a)

Lasioptera populnea: inner gall

section through a gall

Lasioptera populnea: inner gall

section through a gall

inquiline?

Under the name of Contarinia populi Skuhravý, Skuhravá & Brewer depict a gall that clearly belongs to L. populnea, as conceived above. This is because according to several authors populnea is but an inquiline of Contarinia populi and Harmandiola species (Skuhravá & Skuhravý, 2012a).
While describing his Contarinia populi, Rubsaamen (1917a) writes that he had checked all gall material of L. populnea in his collection, and to his surprise had found all but one to contain only Contarinia larvae. His tentative conclusion is that the two species live independently and make closely similar galls.

larva

Lasioptera populnea: spatula

prosternum with spatula (from Möhn, 1955a). A drawing of the spatula by Kieffer (1901a) that was earlier shown here, contains errors (Möhn).

references

Barnes (1951a), Buhr (1965a), Cilbircioğlu & Ünal (2009a), Cogolludo (1921a), Gagné (2010a)m Houard (1908a), Lambinon, Carbonnelle & Claerebout (2015a), Lambinon, Schneider & Feitz (2001b, 2012a), Mïhn (1955a), Redfern & Shirley (2011a), Roskam (2009a), Roskam & Carbonnelle (2015a), Rübsaamen (1895c, 1917a), Simova-Tošić & Skuhravá (2001a), Simova-Tošić, Skuhravá & Skuhravý (1996a, 2000a, 2004a, 2007a), Simova-Tošić, Skuhravá, Skuhravý & Postolovski (2007a), Skuhravá (2011a), Skuhravá, Bayram, Çam ao (2005a), Skuhravá & Skuhravý (1999a, 2012a), Skuhravá, Skuhravý, Blasco-Zumeta & Pujade-Villar (2006a), Skuhravá, Skuhravý & Carbonnelle (2017a), Skuhravá, Skuhravý, Dauphin & Coutin (2005a), Skuhravá, Skuhravý & Meyer (2014a), Skuhravá, Skuhravý & Neacsu (1972a), Skuhravá, Skuhravý, Skrzypczyńska & Szadziewski (2008a), Skuhravý, Skuhravá & Brewer (1997a), Tomasi (2014a), Unal & Akkuzu (2009a), Wachtl (1886a), Wahlgren (1963b).

mod 24.v.2018