Hypnoidus

Dillwyn, 1829

wireworms

Hypnoidus is a of ( ) whose soil-dwelling larval stages are known as . in this genus are found across Eurasia and North America, with several species recognized as agricultural pests. The genus includes economically significant species such as Hypnoidus bicolor and Hypnoidus abbreviatus, which damage roots in the Canadian Prairies.

Hypnoidus by (c) Trevor Van Loon, some rights reserved (CC BY), uploaded by Trevor Van Loon. Used under a CC-BY license.

Pronunciation

How to pronounce Hypnoidus: /hɪpˈnɔɪdəs/

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Habitat

Soil-dwelling; inhabit agricultural soils and field environments. Studies indicate that damage susceptibility varies by soil texture, with loam and silt soils showing greater vulnerability to larval feeding than clay soils.

Distribution

Eurasia and Northern America. Documented from Denmark, Norway, Sweden, and the United States (including Vermont and the Canadian Prairies).

Life Cycle

are soil-living , the stage of . Complete details beyond the larval stage are not well documented for most in this .

Human Relevance

Several are agricultural pests. Hypnoidus bicolor is the most ubiquitous in the Canadian Prairies and can significantly damage soybean at high larval , particularly at lower temperatures (10–20°C). Hypnoidus abbreviatus is noted as more damaging to crops than H. bicolor. These wireworms have become major pests following restrictions on lindane use.

Similar Taxa

Limonius californicusAnother pest in the Canadian Prairies; causes more severe damage than Hypnoidus bicolor

More Details

Cryptic diversity

Genetic studies of Hypnoidus bicolor in the Canadian Prairies have identified two genetically distinct clades (>4.66% COX1 sequence divergence), suggesting possible cryptic within what is currently recognized as a single species.

Population dynamics

Clade A of H. bicolor predominates in eastern prairie localities and shows evidence of and range expansion, potentially associated with intensive agricultural practices. Both clades exhibit uneven among populations with low regional genetic structuring.