Phyllotreta ezoensis Kimoto, 1993

Fig. 3 A – I

Host plant.

Brassicaceae: Draba nemorosa L. The host plant grows on levee of traditional rice fields and upland fields in Central Honshu (Fig. 3 C).

Leaf mine.

Full-depth linear mine of leaf blade, midrib, petiole, and shoot (Fig. 3 D – I). The egg is laid on the leaf, and the hatched larva mines toward the midrib, and reenters midrib / leaf blade. Larvae repeats mining leaf and mining midrib, petiole, and / or shoot, often by exiting its mine and establishing a new mine. Frass is granular, deposited linearly along midline of the mine. The fully grown larva exits the mined leaf, falls to the ground, and pupates underground. The adult emerges ~ 2 weeks after pupation, and varies in elytral pattern (Fig. 3 A, B).

Material examined.

• 6 adults, Matsubara-Lake, Koumi, Nagano Pref. 21-V-2021 (as larva on Draba nemorosa), emerged on 4-VI-2021 (Fig. 3 A – E) ; • 15 adults, Kiyosato, Hokuto, Yamanashi Pref., 4-V-2022 (as larva on D. nemorosa), emerged on 17–20-V-2022 (Fig. 3 F – I) .