Blastodacna atra

(Haworth, 1828)

Apple Pith Moth

Blastodacna atra, commonly known as the apple pith , is a small moth in the Elachistidae. It is native to most of Europe and has been introduced to North America, where it has been recorded in Massachusetts and Ontario. The is notable for its larval habit of mining inside the young shoots of apple trees (Malus species), which can cause localized damage to orchards. are active from May through September in western Europe.

Blastodacna atra 147631522 by Vasyliuk Oleksij. Used under a CC BY 4.0 license.Blastodacna atra (2943524383) by Donald Hobern from Copenhagen, Denmark. Used under a CC BY 2.0 license.Blastodacna atra (8863626407) by Donald Hobern from Copenhagen, Denmark. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Blastodacna atra: /blæstoʊˈdæk.nə ˈæ.trə/

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Identification

Distinguished from similar small Elachistidae by the distinctive forewing pattern: broad white streak with triangular indentation and two black -tufts, combined with narrow dark fuscous ground color. The specific association with apple shoots for larval mining, evidenced by small heaps of , provides additional identification context where larvae are present.

Images

Appearance

Small with wingspan of 11–13 mm. white. Forewings narrow, dark fuscous with broad white streak sprinkled with dark fuscous, extending from base to tornus; streak has broad triangular indentation at 2/5 containing black -tuft. Slender whitish fascia extends from apex of dorsal streak to before apex, with branch posteriorly in middle and sometimes branch below. Second black scale-tuft present in disc before this fascia. Hindwings grey.

Habitat

Orchards and areas with cultivated or wild apple trees (Malus ). Larvae occur within young shoots of plants.

Distribution

Native to most of Europe. Introduced to North America; recorded from Massachusetts and Ontario, Canada.

Seasonality

active May to September in western Europe.

Diet

Larvae mine inside young shoots of apples (Malus ). diet not documented.

Host Associations

  • Malus - larval Larvae mine inside young shoots

Life Cycle

Larval stage spent mining inside young apple shoots; presence indicated by small heaps of . details not documented. emerge in spring through late summer.

Behavior

Larvae create internal mines in young shoots, occasionally causing small swellings; affected shoots may die off.

Ecological Role

Phytophagous herbivore specializing on Malus . Localized pest in apple orchards.

Human Relevance

Minor agricultural pest of apple orchards; larval mining can damage young shoots and reduce tree vigor in localized .

Similar Taxa

  • Other Blastodacna speciesSimilar size and affiliation; distinguished by specific forewing pattern elements and association
  • Other ElachistidaeSimilar size and general ; distinguished by diagnostic white streak with triangular indentation and paired black -tufts on forewing

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Sources and further reading