Monochroa hornigi (Staudinger, 1883)

knotweed neb

on Persicaria, Polygonum

Monochroa hornigi on Persicaria lapathifolia

Persicaria lapathifolia, Belgium, prov.East Flanders, Lebbeke, 19.ix.2018 © Ruben Meert: habitat

Monochroa hornigi on Persicaria lapathifolia

the plant does not show any sign of infection

Monochroa hornigi on Persicaria lapathifolia

larva in the tunnel.

Monochroa hornigi on Persicaria lapathifolia

Persicaria lapathifolia, Belgium, prov. East Flanders, Dendermonde, Baasrode, Vlassenbroekse Polder en Schorren, 12.ix.2018 © Ruben Meert: habitat

Monochroa hornigi on Persicaria lapathifolia

transverse section through a parasitised stem

Monochroa hornigi on Persicaria lapathifolia

cracked stem

parasite

The larva bores in the stem; exteriorly nothing betrays its presence. In the experience of Ruben Meert the species lives, always solitarily, in the neighbourhood of a node.

host plants

Polygonaceae, narrowly oligophagous

Persicaria hydropiper, lapathifolia; Polygonum aviculare.

phenology

The larva lives in the autumn; around November it leaves the tunnel, next lies curled in a semitransparent hibernaculum, covered with reddish brown material, spun at the outside of the stem.

distribution within Europe

(PESI, 2018).

larva

See Bland ao.

references

Barton (2015a), Bland, Corley, Emmet ao 2002a, Leutsch (2011a),
Wullaert (2017a).

mod 2.i.2019