Ectoedemia intimella (Zeller, 1848)

black-spot sallow pigmy

Ectoedemia intimella mine

Salix dasyclados, Nederhorst den Berg

Ectoedemia intimella mine

same mine, detail

Salix caprea: here the larva has moved from the midrib into a side vein, before entering the leaf disc © Jan Scheffers

mine

The egg lies on top of the midrib (rarely a thick lateral vein), mostly c. one cm below the visible part of the mine, generally not far from the base of the leaf. The larva at first hollows the midrib (on the second picture from the top the far right, darkened, part of the midrib has been mined out). Only in its last stage the larva leaves the midrib and makes a triangular blotch, adjacent to the midrib. When the larva isn’t yet too large it retreats into the midrib during feeding pauses. Partly caused by these movements the frass usually lies in two stripes in a V-pattern, parallel to the sides of the blotch. The mines often are found in yellowed leaves in green islands, often in already fallen leaves.

host plants

Salicaceae, monophagous

Salix aurita, babylonica, caprea, cinerea, x fragilis, gmelinii, pentandra, phylicifolia, viminalis.

The reference to Populus by Szőcs (1977a) and Delplanque (1998a) probably is due to confusion with a species like E. hannoverella, that mines the petiole. Recently, however, a population of intimella has been found in Finland that does live on Populus balsamifera (van Nieukerken, A & Z Lastukva, 2010a).

phenology

Larvae from September till November; univoltine (van Nieukerken, A & Z Laštuvka, 2010a) .

BENELUX

BE recorded (Phegea, 2009).

NE recorded (Kuchlein & de Vos, 1999a; Microlepidoptera.nl, 2009).

LUX not recorded (Fauna Europaea, 2009).

distribution within Europe

Europe, except the Balkan Peninsula and the Mediterranean Islands (Fauna Europaea, 2009; A & Z Laštuvka, 2008a).

larva

synonyms

Nepticula intimella.

notes

In material from Nederhorst den Berg the early mine differed from the standard description. The egg was lower-surface, sometimes against the midrib, sometimes 1-2 removed. In the latter case a short corridor was running towards the midrib. In a population in the Amsterdamse Bos the eggs were deposited upper-surface, but again a few mm removed from the midrib.

Salix dasyclados, Nederhorst den Berg: two corridors

egg

references

Bengtsson (2008a), Borkowski (1969a), Buhr (1937a), Černý (2001a), Delplanque (1998a), Diškus & Stonis (2012a), Emmet (1971a, 1983a), Gielis, Huisman, Kuchlein, van Nieukerken, van der Wolf & Wolschrijn (1985a), Gustafsson (1985a), Gustafsson & van Nieukerken (1990a), Haase (1942a), Hering (1957a), Huisman, Koster, van Nieukerken & Ellis (2009a), Huisman, Koster, van Nieukerken & Ulenberg (2001a), Johansson ao (1990a), Klimesch (1950c), Kuchlein & Donner (1993a), Kuchlein & de Vos (1999a), Kurz (2016a), Lambinon, Carbonnelle & Claerebout (2015a), A & Z Laštuvka (1997a, 2008a), van Nieukerken (1985a, 1986a, 2006a), van Nieukerken, A & Z Laštuvka (2006a, 2010a), Nowakowski (1954a), De Prins & Steeman (2011a, 2013a), Robbins (1991a), Schütze (1931a), Sefrová (2005a), Skala (1939a), Skala & Zavřel (1945a), Sønderup (1949a), Szőcs (1977a, 1978a).

mod 29.viii.2019