Author: (Butler, 1879)
Japanese oak leafroller
Species Overview:
Adult: 22-24 mm wingspan; forewing ground colour pale yellow, creamier posteriorly, finely strigulated with ochreous-yellow and with two brownish oblique fasciae. Hindwing pale greyish brown; cilia paler.
Larva: average length 16 mm; head, thoracic legs, prothoracic shield, anal shield and pinacula blackish brown; body greyish green. Anal fork developed [Tortrix sinapina larva].
Taxonomic Description:
Male:
Tortrix sinapina adult 1
Tortrix sinapina adult 2
External characters: 22-24 mm wingspan; labial palp ochreous-yellow, head paler, thorax pale yellow, marked by pale brownish submedian transverse line. Forewing slightly expanding posteriorly; costa bent throughout, apex pointed; termen slightly oblique. Ground colour pale yellow, creamier posteriorly, finely strigulated with ochreous-yellow. Markings brownish, consisting of two parallel oblique fasciae, the first from 1/3 of costa to middle of dorsum, the second from beyond mid-costa to tornus. Cilia paler than ground colour. Hindwing pale greyish brown; cilia paler (Yasuda, 1975b).
male genitalia Tortrix sinapina
Genitalia: Tegumen small; socii large, tapering terminally, with bases large anteriorly, hairs long; tuba analis weak; transtilla a slender band. Valva large, elongate, with well-developed brachiola. Sacculus as long as the ventral edge of valva, bent ventro-terminally; termination of sacculus short, spined. Aedeagus short, proportionally broad, with short cornuti in vesica.
Female:
External characters: similar to male.
female genitalia T. sinapina
Genitalia: Papillae analis very broad, rounded posteriorly, with short but strong hairs in median portions and very short, rounded apically, anterior parts; sterigma very broad, short, rounded anteriorly; antrum broad, short; ductus bursae long, narrowing medially; corpus bursae small; signum broader than in Tortrix viridana.
Variation:
Occasionally dark specimens with ochreous-brown suffusion in the forewing occur.
Biology:
Moths occur from the end of May until mid July.
Host plants:
Quercus mongolica, Quercus dentata, Quercus variabilis, Quercus serrata, Sorbus alnifolia, Tilia japonica, Lespedeza bicolor.
Damage:
Larvae feed on leaves of oak. The species is sometimes abundant and therefore potentially economically important.
Distribution:
Eastern Russia, Eastern China, Japan, Korea.
Pheromone:
Pheromone unknown.
Attractantia:
Z 11-14Ac
(Ando et al., 1978)