Fiorinia theae

Green, 1900

tea scale

Fiorinia theae, known as the tea , is an insect native to Asia that has become an established pest in the Americas. It is on woody plants, with primary including tea (Camellia sinensis), ornamental camellias, and hollies (Ilex ). Heavy cause leaf yellowing, premature defoliation, branch dieback, and plant death. The species is multivoltine in warmer climates, with overlapping and year-round activity in southern regions.

Fiorinia theae Zookey 2021 by Lyle Buss. Used under a CC BY 4.0 license.

Fiorinia theae on Camellia sasanqua by Chazz Hesselein, Alabama Cooperative Extension System, Bugwood.org. Used under a CC BY 3.0 license.

Pronunciation

How to pronounce Fiorinia theae: /fi.oːˈriː.ni.a ˈtʰi.aɪ/

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

Identification

Distinguished from other Fiorinia by the elongated dark brown female cover (1.0–1.5 mm) contrasting with the white male scale cover. Heavy produce conspicuous white wax secretions visible on leaf undersides. males are winged and -like, unlike the females. Microscopic examination of morphological features or may be required for definitive separation from closely related species such as Fiorinia phantasma or Fiorinia fioriniae, which can appear similar in the field.

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Habitat

Found on the undersides of leaves of woody plants. Occurs in cultivated settings including tea plantations, ornamental nurseries, and residential landscapes. Thrives in warmer climates with multiple per year; activity diminishes in cooler regions where fewer generations occur.

Distribution

Native to southern Asia, with records from India (type locality), Sri Lanka, Philippines, Taiwan, southern China, Nepal, Malaysia, Indonesia, Brunei, Cambodia, and Japan. Introduced to the Americas in the early 20th century; first recorded in South Carolina in 1908. Now established throughout the eastern and south-central United States from Massachusetts to Texas and Kansas, with additional records from California, the Bahamas, Mexico, Central America, and Argentina in South America.

Seasonality

Year-round activity in southern regions such as Florida, where multiple overlapping occur and all life stages may be present simultaneously. In northern states, fewer generations per year with reduced winter activity. A single generation requires 45–65 days under favorable conditions.

Diet

Phloem sap feeder on woody plants. range includes Camellia sinensis (tea), other Camellia , Ilex species (holly), Citrus, and numerous other ornamental and crop trees and shrubs across more than 20 in 18 plant .

Host Associations

Camellia sinensis - primary Tea plant; type locality
Camellia japonica - Highly susceptible ornamental camellia
Camellia sasanqua - Ornamental camellia
Ilex cornuta - Highly susceptible non-native holly
Ilex vomitoria - Native holly; relatively
Ilex opaca - Native holly; relatively
Citrus - Crop

Life Cycle

hatch after 1–3 weeks into first instar that disperse by or wind. Crawlers become after approximately one week, begin feeding, and to second instar after 10 days. Females molt once more and remain as within the second-instar . Males undergo three additional molts to reach adulthood. Total development from egg to adult female requires 3–4 weeks; male development is slightly longer. Multiple overlapping occur annually in warm climates.

Behavior

are the stage, moving to new plant parts or spreading via wind. females are permanently beneath their protective cover. Adult males are winged, mobile, and do not feed. Heavy produce copious white wax secretions.

Ecological Role

Economic pest causing direct damage to plants through phloem feeding. Extensive result in leaf , premature defoliation, reduced plant vigor, branch dieback, and host plant mortality. Susceptibility varies among host and cultivars.

Human Relevance

Significant pest of ornamental camellias and hollies in the southeastern United States, where it is considered a key pest of landscape plants. Damage to tea crops in Asia. Management is complicated by the protected feeding position on leaf undersides and hard covers that limit efficacy. using such as Aphytis diaspidis has been attempted, with Aphytis theae introduced from India to Florida in 1976 but failing to establish due to winter mortality.

Similar Taxa

Fiorinia phantasmaSimilar appearance and ; distinguished by preference (palms) and microscopic morphological features; may be required for definitive identification
Fiorinia fioriniaeSimilar appearance and ; commonly found on palms; field identification difficult without detailed examination
Fiorinia externaSimilar ; elongate hemlock scale primarily on conifers such as fir and hemlock; distinct association aids separation

More Details

Management challenges

The protected feeding position on leaf undersides and hard covers make chemical control difficult. are less harmful to natural enemies but may be insufficient for heavy . Pruning before application has been suggested to improve efficacy.

Biological control attempts

Aphytis theae was introduced from India to Florida in 1976 for but failed to survive winter conditions. Native including Aphytis diaspidis occur in southeastern North America.