Bathyplectes curculionis

(Thomson, 1887)

Bathyplectes curculionis is a in the that attacks of the (), a major pest of alfalfa . It has been and established in various regions as a agent. Field studies indicate that its are influenced by sugar availability, including and floral nectar. In some regions, it has been displaced by the Bathyplectes anurus, which exhibits superior reproductive capacity, more rapid handling, and avoidance of host .

Pronunciation

How to pronounce Bathyplectes curculionis: /ˌbæθɪˈplɛktiːz kɜːrˌkjuːliˈoʊnɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Morphological identification traditionally requires rearing to the stage. -based methods using -specific have been developed for faster and can identify larvae without rearing; these methods detect 5–7 times more B. curculionis individuals than conventional rearing in field .

Habitat

Alfalfa fields and other supporting of its , the .

Distribution

Documented in Spain (field studies 2019–2020), Oklahoma, eastern Ontario, Illinois, Missouri, Arkansas, and western Canada (Alberta: Cranford, Manyberries, Milk River, Orion, Sterling).

Diet

feed on sugar sources including floral nectar, , and sugar sprays. Glucose and fructose have been shown to increase longevity more effectively than or melezitose.

Host Associations

Hypera postica - larval Primary ; parasitizes . Host of has been documented in some .
Hypera brunneipennis - larval ; studied in relation to temperature.

Life Cycle

develop internally within larvae. Identification typically requires rearing to stage for morphological confirmation.

Behavior

Foraging decisions are influenced by food deprivation and prior experience. are attracted to odor, though they are not ; this response may be learned. increase in fields with accessible sugar sources.

Ecological Role

agent that contributes to natural suppression of . Effectiveness varies with environmental conditions and competing mortality factors such as fungal (Zoophthora phytonomi). In some regions, has been displaced by B. anurus, which exhibits greater reproductive output, faster handling, and avoidance of host .

Human Relevance

Used in programs against the . practices that enhance sugar availability (reduced use, strips, nearby flowering ) can improve its effectiveness.

Similar Taxa

Bathyplectes anurusCongeneric of that has displaced B. curculionis in eastern Ontario and other regions due to higher reproductive capacity, more rapid search and handling, aggressive , and to . B. anurus spin jumping ; this behavior has not been documented for B. curculionis.
Bathyplectes anuraClosely related with which B. curculionis is frequently confused; molecular methods ( with species-specific ) are required to distinguish in field .

More Details

Detection Methods

-based using two pairs of -specific is more sensitive than conventional rearing for detecting B. curculionis , but rearing remains necessary to confirm effective and detect unexpected species. Both methods are recommended for evaluating – systems.

Competitive Displacement

In eastern Ontario, B. anurus displaced B. curculionis through a combination of r- and K-selected traits: greater reproductive capacity, more rapid search and handling, aggressive , and avoidance of . B. anurus also reduces competition with Zoophthora phytonomi by parasitizing older hosts more likely to survive fungal .

Sugar Nutrition

longevity is significantly affected by sugar . Glucose and fructose are most ; and melezitose are less effective. Mating status also influences longevity in conjunction with availability.