Monochroa hornigi (Staudinger, 1883)
knotweed neb
on Persicaria, Polygonum
Persicaria lapathifolia, Belgium, prov.East Flanders, Lebbeke, 19.ix.2018 © Ruben Meert: habitat
the plant does not show any sign of infection
larva in the tunnel.
Persicaria lapathifolia, Belgium, prov. East Flanders, Dendermonde, Baasrode, Vlassenbroekse Polder en Schorren, 12.ix.2018 © Ruben Meert: habitat
transverse section through a parasitised stem
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
larva
See Bland ao.
references
Barton (2015a), Bland, Corley, Emmet ao 2002a, Leutsch (2011a),
Wullaert (2017a).