Lilioceris cheni

Gressitt & Kimoto, 1961

air potato leaf beetle

Lilioceris cheni is a leaf-feeding beetle in the Chrysomelidae, native to China and Nepal. It was introduced to Florida in 2012 as a agent to combat the air potato vine (Dioscorea bulbifera). The has established successfully and is now widely distributed across the southern United States. Mass rearing programs produce over 50,000 beetles annually for release. Both larvae and feed on air potato foliage, causing significant damage that reduces vine and bulbil production.

Chrysomeloidea (10.3897-zookeys.762.22163) Figures 31–34 by Li K, Liang H (2018) A comparative study of external female genitalia (including the 8 th and 9 th abdominal segments) in the family Megalopodidae and other related families of Chrysomeloidea. ZooKeys 762: 69-104. https://doi.org/10.3897/zookeys.762.22163. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Lilioceris cheni: //ˌlɪli.oʊˈsɪərɪs ˈkiːnaɪ//

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

Identification

The bright red with black legs and separate this from most other North American leaf beetles. Within its introduced range in the southeastern United States, no other shares this specific color pattern and association with air potato vine. The related Lilioceris lilii (lily beetle) has similar red coloration but is found on true lilies (Lilium) in more northern regions and has a different body shape.

Images

Habitat

In its native range, associated with Dioscorea in forested and disturbed . In the introduced range, found wherever air potato vine invades, including natural areas, disturbed sites, roadsides, and urban green spaces. Mass rearing occurs in greenhouse, screenhouse, and outdoor facilities with potted air potato plants.

Distribution

Native to China and Nepal. Introduced and established in Florida, Georgia, Alabama, Mississippi, Louisiana, Texas, and Hawaii in the United States. Released at nearly 7,000 sites across these states between 2014 and 2021.

Seasonality

are active year-round in subtropical Florida, with peak activity during warmer months. In temperate parts of the introduced range, activity is limited to the growing season. The complete spans approximately 28 days under favorable conditions.

Diet

Highly specialized feeder on Dioscorea . Dioscorea bulbifera (air potato) is the preferred . feed on fresh leaves and can survive on bulbils but with reduced lifespan. Larvae require fresh air potato vine leaves for development and cannot survive on artificial diet alone. No successful development or occurs on 73 non-Dioscorea plant species tested.

Host Associations

Dioscorea bulbifera - primary air potato vine; preferred for all life stages
Dioscorea oppositifolia - secondary limited feeding, no successful
Dioscorea alata - secondary limited feeding, no successful
Dioscorea japonica - secondary limited feeding, no successful
Dioscorea pentaphylla - secondary limited feeding, no successful

Life Cycle

Holometabolous development with complete . hatch in approximately 4 days. Four larval instars last about 8 days total. Larvae drop from plants to pupate in soil, secreting a whitish foamy substance that hardens into a protective cocoon. Pupal stage lasts approximately 14 days. emerge and can live over 5 months under field conditions, up to 1 year in laboratory. Adults require approximately 10 days post- before mating begins.

Behavior

bite leaf , causing leaves to cup—females preferentially lay in these cupped areas. Larvae exhibit a distinctive defensive of accumulating and carrying excrement on their backs, presumably to deter . Adults can survive starvation for several days to two weeks depending on prior nutritional status, allowing for distribution and short-term survival post-release.

Ecological Role

agent that reduces of air potato vine, thereby protecting native plant from displacement. The is considered a cost-effective management alternative to chemical and mechanical control methods. High specificity minimizes risk to non-target native and agricultural plants.

Human Relevance

Intentionally introduced and mass-reared for of air potato vine in the southern United States. The Florida Department of Agriculture and Consumer Services Division of Plant Industry produces and releases over 50,000 beetles annually. Considered a success story in , with documented reductions in air potato vine and bulbil production at release sites.

Similar Taxa

Lilioceris liliiSimilar red coloration and body form, but found on true lilies (Lilium) rather than air potato, with more northern distribution in North America
Lilioceris egenaRelated also evaluated for air potato biocontrol, introduced from Nepal and China; females lay on tubers rather than leaves

More Details

Biotypes

Two distinct were collected: Chinese (2011) and Nepalese (2002). Both were released in Florida in 2012.

Mass Rearing

From 2014–2021, 407,554 beetles were produced and 366,384 released at nearly 7,000 sites across six states.

Egg Production

Females can lay more than 1,200 in their lifetime, with some sources reporting up to 1,900 eggs over a 5-month lifespan.