Mycophila speyeri

(Barnes, 1926)

Mycophila speyeri is a mushroom-infesting cecid fly in the Cecidomyiidae, first described by Barnes in 1926. It reproduces primarily through larval , a form of in which larvae produce daughter larvae directly. and flies are rarely observed in commercial mushroom growing operations. The has been documented as a significant pest of cultivated mushrooms in Pennsylvania and has been reported from China and several European countries including Denmark, Norway, Sweden, and Japan.

Pronunciation

How to pronounce Mycophila speyeri: /maɪˈkɒfɪlə ˈspaɪəri/

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Habitat

Mushroom growing houses and cultivated mushroom substrate. develop during the spawn-run phase of mushroom (70–75°F) and persist through the cropping phase (55–60°F). occur only when larval populations become crowded on old, depleted growing media.

Distribution

Native distribution unclear; documented from Pennsylvania, USA (where it was the most important mushroom pest at time of study); China (Jiangsu Province); Denmark; Japan; Norway; Sweden.

Diet

Cultivated mushrooms; larvae feed on mushroom mycelium and fruiting bodies in commercial growing operations.

Host Associations

  • cultivated mushrooms - pestprimary in commercial mushroom growing houses

Life Cycle

time approximately one week at 70–75°F during spawn-run, extending to approximately three weeks at 55–60°F during cropping. Larval is the main reproductive mode, with about ten daughter-larvae produced per mother-larva under favorable conditions. and are rare in commercial settings, occurring only when become crowded on old growing media.

Behavior

Reproduces primarily through ; is -dependent and associated with crowded conditions on depleted substrate.

Ecological Role

Pest of commercial mushroom . No known beneficial ecological functions documented.

Human Relevance

Economic pest of the cultivated mushroom industry, particularly in Pennsylvania where it was historically the most important cecid fly pest. Control relies on preventing during spawn-run and to prevent spread once larvae are present.

Similar Taxa

  • Mycophila longispina in same , described from Shandong Province, China; distinguished by morphological features of the larval spines
  • Mycophila echinoidea in same , described from Sichuan Province, China; distinguished by morphological features of the larval spines

More Details

Reproductive plasticity

Malt quantity in the culture medium, spawn age, and strain differences in spawn affect length and , indicating substantial phenotypic plasticity in response to environmental conditions.

Taxonomic history

Originally described as Pezomyia speyeri Barnes, 1926; later transferred to Mycophila.

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Sources and further reading