Octotoma championi

Baly, 1886

lantana leafminer, lantana leaf beetle

Octotoma championi is a leaf beetle in the Chrysomelidae, commonly known as the leafminer or lantana leaf beetle. Native to Central and North America, it has been introduced to Australia, Fiji, Hawaii, and South Africa as a agent for the weed Lantana camara. The has a leaf-mining larval phase and free-living, leaf-chewing . Research indicates its development and consumption rates are sensitive to elevated CO2 and temperature conditions.

Pronunciation

How to pronounce Octotoma championi: /ˌɒktoʊˈtoʊmə ˈtʃæmpiəˌnaɪ/

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Distribution

Native to Central America and North America, with records from the United States (Texas), Belize, Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama. Introduced to Australia, Fiji, Hawaii, and South Africa for purposes.

Diet

Larvae feed on camara, Lantana hispida, and Lantana trifolia. feed on Mentha, Origanum, and Sesamum .

Host Associations

Lantana camara - larval food plantPrimary for
Lantana hispida - larval food plant
Lantana trifolia - larval food plant
Mentha - food plant level only
Origanum - food plant level only
Sesamum - food plant level only

Life Cycle

Complete development has been measured experimentally. Larval development occurs as leaf-miners within plant leaves. Development time is accelerated by approximately 10–13 days at higher temperatures (+3°C), but is not affected by CO2 concentration. Elevated CO2 alone increases larval development time; combined elevated CO2 and temperature results in slower development than ambient conditions but faster than elevated CO2 alone. beetles are free-living and leaf-chewing.

Behavior

Larvae are endophagous leaf-miners. are mobile, free-living leaf-chewers. Short-term feeding trials indicate that when given no choice, adults consume more from ambient CO2-grown foliage than elevated CO2-grown foliage. When offered a choice between foliage grown at two CO2 levels, O. championi did not display a significant preference.

Ecological Role

Herbivore and leaf feeder. Used as a agent for the weed camara. Under future climate conditions of higher temperatures and elevated CO2, amelioration of water stress in plants may benefit this endophagous insect by reducing premature leaf loss, potentially outweighing deleterious effects of lower leaf nitrogen.

Human Relevance

Used as a agent for camara, an weed in many regions. Research subject for understanding climate change effects on insect herbivores, specifically responses to elevated CO2 and temperature.

Similar Taxa

Octotoma scabripennisCongeneric with similar , also a agent of camara; distinguished by consumption preferences under choice conditions—O. scabripennis consumes more ambient CO2-grown foliage at lower temperatures while O. championi shows no significant preference

More Details

Climate change responses

Experimental studies show complex interactions between CO2 and temperature effects. Elevated CO2 reduces leaf nitrogen concentration and increases C:N ratios in plants, potentially reducing food quality. However, elevated CO2 also ameliorates water stress under high temperature conditions, reducing wilting and premature leaf loss that would otherwise reduce success. This suggests net effects of climate change on this may depend on water availability and temperature interactions.