Lebia subgrandis
Madge, 1967
Lebia subgrandis is a ground beetle in the Carabidae, native to Mexico and found in North America. This has been investigated as a potential agent for the Colorado Potato Beetle (Leptinotarsa decemlineata). are of CPB and early instar larvae, while first instar larvae are specialized of CPB and pupae. The species exhibits a notably narrow range, refusing alternative prey even when starved.
Pronunciation
How to pronounce Lebia subgrandis: /ˈle.bi.a sʌbˈɡræn.dɪs/
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Habitat
Larvae actively seek in soil, where they locate Colorado Potato Beetle and pupae. forage on vegetation where host prey occurs. Specific vegetation or climatic preferences beyond host association are not documented.
Distribution
Native to Mexico; recorded from North America. Investigated for potential use in the northeast United States, though establishment status there is unconfirmed.
Diet
Colorado Potato Beetle (Leptinotarsa decemlineata) and 1st through 3rd instar larvae (); CPB and pupae (first instar larvae, as ). Adults refuse alternative prey including Coleomegilla maculata, Oplomus sp., and reduviid even when starved.
Host Associations
- Leptinotarsa decemlineata - / prey on and larvae; larvae are of and pupae
Life Cycle
First instar larvae are with an average lifespan of 8.3 days. lifespan is 4-5 months. Reproductive output is temperature-dependent, with early-summer females producing more offspring than late-summer females.
Behavior
forage both diurnally and nocturnally. First instar larvae actively search for in soil. Mating appears infrequent; oviposition rates showed no difference when females were confined with males for varying durations (0-3 days versus entire experiment). Adults exhibit strong prey fidelity, maintaining narrow host range under confinement.
Ecological Role
Specialized and ectoparasitoid of Colorado Potato Beetle. Potential agent, though efficacy limited by narrow range and specific larval host-seeking requirements.
Human Relevance
Investigated as a candidate agent for Colorado Potato Beetle management in potato crops, particularly in the northeast United States. Not known to be established as an introduced biological control agent.
Similar Taxa
- Other Lebia speciesMany Lebia are colorful foliage ground beetles attracted to lights; L. subgrandis distinguished by specific association with Colorado Potato Beetle and documented range testing
- Chlaenius tricolorBoth are vivid metallic ground beetles in Carabidae; C. tricolor is frequently attracted to blacklights and lacks the documented narrow specificity of L. subgrandis