Bathyplectes infernalis

(Gravenhorst, 1820)

Bathyplectes infernalis is a in the Ichneumonidae. It is a agent of the alfalfa weevil (Hypera postica), a major agricultural pest in western North America. The has been introduced and released in the United States as part of programs. It is one of several Bathyplectes species used to manage weevil in alfalfa fields.

Bathyplectes infernalis by John Abrams. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Bathyplectes infernalis: /ˌbæθɪˈplɛktiːz ˌɪnfərˈneɪlɪs/

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Identification

As a small ichneumonid , B. infernalis can be distinguished from similar by its association with alfalfa weevil and its geographic distribution. It may be confused with the related B. anurus, which also parasitizes alfalfa weevil but exhibits distinctive cocoon-spinning and jumping in the larval stage. Accurate identification typically requires examination of morphological characters by a .

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Habitat

Alfalfa fields and agricultural landscapes where its , the alfalfa weevil, occurs. The is associated with cultivated Medicago sativa (alfalfa) stands rather than natural or undisturbed .

Distribution

Native to Europe (Denmark, Norway). Introduced and established in the conterminous 48 United States, where it is present in alfalfa-growing regions.

Diet

The larval stage develops as a within alfalfa weevil (Hypera postica) larvae, eventually killing the . feed on honeydew, including that produced by aphids in alfalfa fields.

Host Associations

Hypera postica - primary Larval ; introduced to North America specifically for of this pest

Ecological Role

agent that reduces of the alfalfa weevil, an economically significant pest of alfalfa. Its presence can decrease reliance on chemical in programs. Interactions with other in alfalfa agroecosystems include indirect benefits from honeydew, which supports survival and may enhance rates.

Human Relevance

Used in programs to protect alfalfa crops from weevil damage. Its effectiveness contributes to reduced applications, though practices (reduced spraying, strips, flowering ) can further support .

Similar Taxa

Bathyplectes anurusAlso parasitizes alfalfa weevil and has been released for in western North America. B. anurus is distinguished by larval cocoon-spinning and jumping , which B. infernalis does not exhibit.
Bathyplectes curculionisAnother Bathyplectes used in alfalfa weevil ; morphological differentiation requires examination.