Plant Parasites of Europe

leafminers, galls and fungi

Caloptilia betulicola

Caloptilia betulicola (Hering, 1928)

red birch slender

Caloptilia betulicola mine

Betula pubescens, Vlaardingen (herb. B van As)

Caloptilia betulicola mineCaloptilia betulicola mine

mine with initial corridor; same mine, lighted from behind

mine

The mine starts with an inconspicuous epidermal corridor, mainly visible by a reddish brown frass line. During the following larval stage a blotch is formed, that quickly develops into a tentiform mine; the epidermis is brown. Generally the mine is lower-surface, but upper-surface mines are not rare. Frass in a mass of grains in a corner of the mine. After having left its mine the larva moves twice. First it lives in a rolled (sometimes just folded) leaf margin, after that in a leaf that is transversely rolled downwards, starting from the leaf tip; generally the entire leaf is involved. Pupation in a white, strongly shining, parchment-like cocoon, that is fixed with silk to the leaf margin.

host plants

Betulaceae, monophagous

Betula pendula, pubescens.

Preference for suckers and seedlings.

phenology

Larvae in May and July, pupae in May-June and in August (Emmet, Watkinson & Wilson, 1985a).

BENELUX

BE recorded (Phegea, 2008).

NE recorded (Kuchlein & de Vos (1999a; Microlepidoptera.nl, 2008).

LUX not recorded (Fauna Europaea, 2008).

distribution within Europe

From Scandinavia and the north of European Russia to the Pyrenees and Alps, and from Ireland to Poland and Slovakia (Fauna Europaea, 2008); also Iberia (A & Z Laštůvka, 2014a).

larva

Whitish with pale brown head; pronotum without black spots (contrary to Parornix betulae).

pupa

See Patočka & Zach (1995a), Patočka & Turčáni (2005a), in a shiny, yellowish cocoon.

Caloptilia betulicola: pupaCaloptilia populifoliella: pupa

Dorsal image of head and pronotum of the pupa of C. populetorum (at left) and C. betulicola right). The pronotum of populetorum bears a pair of elongated ridges, while that in betulicola shows a pair of shallow depressions (from Patočka & Zachs).

synonyms

Gracillaria betulicola.

notes

Also many members of the Lepidoptera family Tortricidae live in leaf rolls. However, contrary to Tortricidae larvae, Caloptilia larvae leave the outer layers of the palisade parenchyma uneaten, causing their leaf rolls to remain green (Emmet, Watkinson & Wilson,1985a).
It has long been assumed that the leaf rolls of C. betulicola would run perpendicular to the midrib, those of C. populetorum parallel with it. However, recently Ben van As has shown shoots bearing several leaf rolls where both pattern co-occurred. Apparently the rolls of both species are indistinguishable.

references

Bengtsson & Johansson (2011a), Biesenbaum (2010a), SCS Brown (1947a), Buszko (1992c), Deutschmann (2008a), Emmet, Watkinson & Wilson (1985a), Heckford (1986a), Hering (1927b, 1957a), Huisman, Koster, van Nieukerken & Ellis (2009a), Jaworski (2009a), Kirichenko, Triberti, Akulov ao (2019a), Klimesch & Skala (1936b), Kollár & Hrubík (2009a), Kuchlein & Donner (1993a), Kuchlein & de Vos (1999a), Laštůvka & Laštůvka (2014a), Opheim (1977a), Patočka & Turčáni (2005a), Patočka & Zach (1995a), Plóciennik, Pawlikiewicz & Jaworski (2011a), De Prins & Steeman (2013a), Robbins (1991a), Skala & Zavřel (1945a), Szőcs (1977a).

Last modified 6.x.2020