Crypticerya genistae
(Hempel, 1912)
Genista Giant Scale Insect, fluted scale, channeled mealybug
Crypticerya genistae is a giant insect in the tribe Iceryini, native to South America and accidentally introduced to Florida by 2005, the Cayman Islands by 2006, Ecuador, and Peru. females produce a distinctive large white fluted ovisac measuring 17–19 mm. The has been recorded on at least eleven plant species, primarily in the Fabaceae, and appears to prefer herbaceous plants and shrubs over trees. It is considered an pest in urban green areas and poses potential phytosanitary risks to agricultural crops including Cajanus cajan (pigeon pea).
Pronunciation
How to pronounce Crypticerya genistae: //ˌkrɪptɪˈsɛriə dʒəˈnɪstiː//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from the widespread cottony cushion scale (Icerya purchasi) by its substantially larger ovisac (17–19 mm vs. smaller). Distinguished from congeneric Crypticerya multicicatrices by preference (herbaceous plants and shrubs vs. trees) and by ovisac . Very similar to Icerya rileyi and Icerya littoralis; precise identification may require expert examination. The large, erect or parallel-held white fluted ovisac with longitudinal grooves is the key field characteristic.
Images
Appearance
female has a light orange body with black legs. The most distinctive feature is a large white fluted ovisac measuring 0.66–0.75 inches (17–19 mm), held either erect or parallel to the plant. The ovisac has longitudinal channels or grooves, giving the group its 'fluted scales' or 'channeled mealybugs'.
Habitat
Urban green areas and agricultural . Appears to prefer shrubs and herbaceous plants over trees. Found on ornamental plants in urban environments and on food crops in agricultural settings.
Distribution
Native to South America (including Brazil). Introduced to: Florida, USA (by 2005); Cayman Islands (by 2006); Guayas Province, Ecuador (first record, ); Tumbes region, Peru (first record). Distribution in the New World is expanding.
Diet
Sap-sucking herbivore; phloem feeder. Specific feeding mechanism not detailed beyond general insect .
Host Associations
- Libidibia glabrata - Fabaceae; young tree, Tumbes, Peru
- Neptunia - Fabaceae; herbaceous plant, level identification, Tumbes, Peru
- Cajanus cajan - Fabaceae; pigeon pea, food crop, Tumbes, Peru; poses phytosanitary risk
- ornamental plants - various in urban green areas, Guayas Province, Ecuador; eleven new records documented
Life Cycle
involves production of ovisacs with longitudinal channels or grooves. Specific details of production, nymphal stages, and development not provided in sources.
Behavior
Ovisac held either erect or parallel to the plant. Causes in urban green areas. Associated with sooty molds, yellowing of leaves, and in some cases tree dieback when are severe.
Ecological Role
Herbivorous pest; heavy associated with growth (likely due to honeydew ), leaf yellowing, and plant dieback. Potential to alter local and adaptive in newly invaded regions, though this has been hypothesized rather than demonstrated.
Human Relevance
pest in urban green areas and agricultural systems. Considered a serious pest in urban green areas of Ecuador. Poses phytosanitary risk to local agriculture, particularly for food crops such as Cajanus cajan (pigeon pea). Management strategies for control have been discussed in the literature.
Similar Taxa
- Icerya purchasiSimilar light orange body, black legs, and white fluted ovisac; distinguished by smaller ovisac size
- Icerya rileyiVery similar appearance; precise distinction unclear from available sources
- Icerya littoralisVery similar appearance; precise distinction unclear from available sources
- Crypticerya multicicatricesCo-occurring fluted scale; distinguished by preference for trees vs. herbaceous plants/shrubs, and different ovisac
More Details
Ovisac terminology
The 'fluted scales' refers to the longitudinal flutes or grooves on the ovisac. The alternative common name 'channeled mealybugs' similarly refers to longitudinal channels or grooves in the ovisacs of that produce them.
Invasive spread pattern
Documented spread from South America to Florida (by 2005), Cayman Islands (by 2006), Ecuador, and Peru suggests ongoing range expansion with potential for further spread. Both Ecuador and Peru records represent first reports for those countries, indicating this is actively expanding its distribution.