Orchestes fagi (Linnaeus, 1758)

Orchestes fagi: mine on Fagus sylvatica

Fagus sylvatica, Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel

Orchestes fagi: mine on Fagus sylvatica

initial gallery

Orchestes fagi: cocoon in the mine

mine with fresh cocoon

Orchestes fagi: mine with cocoon

Fagus sylvatica, Duin en Kruidberg: mine with old cocoon

Orchestes fagi: oviposition scar

oviposition scar

mine

Oviposition in the underside of the midrib, rarely in a thick lateral vein. At this site the vein swells, and splits open over a few mm. The larve begins by making a short mine in the midrib, but soon enters the blade with an the narrow, but gradually widening corridor that generally runs towards the leaf tip. The final part of the mine is a broad blotch that generally occupies a initially part of the leaf tip or leaf margin. Frass in the corridor part in an indistinct central line, higher up it is irregular, often also in longer threads. Against the end of May a globular cocoon is secreted by the larva inside the mine; here pupation takes place.

The mine initially is whitish, but it turns brown soon. Later the mine withers away totally, but the infestation remains visible in the ravaged leaves, that still show the oviposition scar and often also the first part of the corridor.

hostplants

Fagaceae, monophagous

Fagus sylvatica.

phenology

Larvae in April-May (Scherf, 1964a).

BENELUX

BE recorded (Curculionidae.be, 2010).

NE recorded (Heijerman, 1993a)

LUX not recorded (Fauna Europaea, 2007).

distribution within Europe

From Norway, Ireland and France eastwards till Poland, the Balkan Peninsula and Italy.

larva

synonyms

Rhynchaenus, Euthoron, fagi

notes

In the Netherlands rather common. At times a mass-outbreak may occur, during which hardly any leave remains undamaged (von Frauenfeld, 1864a; Oudemans, 1929a). Very common in the UK (Morris, 1993a).

After the female has come out of the winter diapause she must first eat (beech leaves, sometimes hawthorn, of wich the leaves unfold somewhat earlier) to let the eggs in her develop; only then oviposition can take place. Already in a week after bud burst the tissues of the beech leaves begin to toughen, and the larvae then cannot complete their development. Obviously, only one generation per year is possible. A perfect synchronisation of the hibernating female with bud burst is of vital importance (Bale, 1984a).

references

Bale (1981a, 1984a), Bale & Luff (1978a), Beiger (1979a), Buhr (1933a), Caillol (1954a), Csóka (2003a), van Frankenhuyzen & Houtman (1972a), van Frankenhuyzen Houtman & Kabos (1982a), von Frauenfeld (1864a), Haase (1942a), Hartig (1939a), Heijerman (1993a), Hering (1924a, 1930a, 1935a, 1957a), Huber (1969a), Kleine (1924a/1925a), Kollár (2007a), Kollár & Hrubík (2009a), Maček (1999a), Matošević, Pernek, Dubravac & Barić (2009a), le Monnier (2003a), Morris (1993a), Nowakowski (1954a), Oudemans (1929a), Reinheimer & Hassler (2010a), Robbins (1991a), Scherf (1964a), Seidel (1957a), Skala (1951a), Skala & Zavřel (1945a), Sønderup (1949a), Starý (1930a), Tomov & Krusteva (2007a), Trägårdh (1910a), Vorst (2010a), Zoerner (1969a, 1970a).

23/01/2017

pub 23.i.2017 · mod 6.viii.2017