Seq # 362920130

Dichrorampha sequana (Hübner, 1799) Species

Last modified: May 24, 2024, 3:40 p.m.

A very rare and local species in Belgium, not seen for a very long time. Presumably extinct.


Family: Tortricidae > Subfamily: Olethreutinae > Tribus: Grapholitini > Genus: Dichrorampha > Species: Dichrorampha sequana
Vernacular names
Gezadelde wortelmot (NL), Square-spot Drill, White-spot Yarrow Moth (EN)
First mention in Belgium
Lambillion L.-J. 1904e. Lépidoptères nouveaux pour la Belgique. — Revue mensuelle de la Société entomologique namuroise 4: 67. On page 67.




Wingspan 9–11 mm. A small Dichrorampha species recognized by the conspicuous, broadly, cream-white rectangular medio-dorsal blotch of the forewing and white basal striae. It also has prominent white costal strigulae and black dots near termen. The male has a costal fold to one half.

Museum specimens

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Specimens in nature

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Body whitish, head light brown, laterally darkened, prothoracic plate light brown.

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The larva bores and feeds in the roots and rootstock of the food plant, with no noticeable effect on plant growth.
It pupates in a cocoon in the ground or on the host plant. It flies in afternoon sunshine and towards dusk and later come to light.

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Flight periods

The adults are on the wing during May and June.

Observed on

Host plant (species):
Achillea millefolium and Tanacetum vulgare

The larva lives on Achillea millefolium and Tanacetum vulgare. Whether Leucanthemum vulgare is used as a food plant is still unclear.

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It inhabits wasteland, embankments, flowery grasslands, herb-rich roadsides and pastures.

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