Cleopomiarus hispidulus
(LeConte, 1876)
clover root curculio
Cleopomiarus hispidulus, commonly known as the clover root curculio, is a weevil in the Curculionidae that is a significant pest of alfalfa and clover crops across North America. The species was first discovered in New Jersey in 1875 and has been historically overlooked despite causing chronic damage to forage systems. Larval feeding on root nodules and taproot cortex represents the most damaging life stage, while foliage feeding causes minimal harm. The species has undergone taxonomic revision, with previous names Miarus hispidulus and M. hispidus now synonymized under the current combination.
Pronunciation
How to pronounce Cleopomiarus hispidulus: /ˌkliːoʊpəˈmaɪərəs hɪˈspɪdjʊləs/
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Distribution
North America (present); specifically documented from New Jersey (type locality) and occurring throughout alfalfa and clover growing regions of the continent.
Diet
Larvae feed underground on nitrogen-fixing root nodules and taproot cortex of alfalfa and clover; feed on foliage causing minimal damage.
Life Cycle
Larval stage occurs underground and is the most damaging stage; specific details of , pupal, and longevity not documented in available sources.
Behavior
Larvae feed cryptically underground, making detection and monitoring difficult; damage accumulates over time rather than killing plants outright.
Human Relevance
Major pest of alfalfa and clover production systems; larval feeding causes decreased stand establishment, reduced stand , shortened stand life, increased winterkill, and decreased water and nutrient uptake. Damage synergizes with secondary plant to reduce yield two- to three-fold compared to single pest damage. No established , predictive models, or registered targeting larvae currently exist.
Misconceptions
Damage is frequently unnoticed or mischaracterized as resulting from other pests or ; the has been overlooked as a pest in forage systems for decades despite its widespread impact.