Biology: Larvae hatch between mid-April
and early May. After feeding through three shoots and only four moltings,
larvae pupate end of May/early June in undamaged internodes. Emergence
of adults occurs at the end of June/early July. Eggs are laid under
leaf sheaths of the host plant.
Description: Larvae up to 3 cm long,
larval body in the beginning brownish-grey, later greyish, with several
black spots on each segment, tracheal trunks shining through skin
as brown lateral lines (picture 43), head and parts of the neck shield
and anal plate dark-brown/black; pupae 13-20 mm, orange, head downwards;
adults light-brown winged, hind wings without black spot on the underside,
neck with line of white scales (picture 45)
Feeding pattern/damage: Freshly hatched
larvae enter shoots below the growing point, severe the tip from the
base within 24 hours, and afterwards feed above the growing point.
Such shoots look the same as the ones infested by the twin-spotted
wainscot: usually completely dead, 0.4-0.5 mm large entrance hole,
severed shoot tip, frass above the growing point, and 1-1.2 mm large
exit hole. In contrast to other moths feeding on common reed, frass
of larvae of the white-mantled wainscot is found most of the time
mainly above the growing point. Pupation occurs in undamaged internodes
with the head downwards (picture 73) (minimal shoot diameter 4.5 mm).
Damage caused by the white-mantled wainscot is very similar to that
of the other three stem-mining wainscots.
et al., 1983; Haefliger
et al., 2006
Pic. 43: Mature larva
of Archanara neurica
Pic. 45: Adult of
Pic. 73: Pupa of