Tetraleurodes

Cockerell, 1902

whitefly

Species Guides

2

Tetraleurodes is a of whiteflies (Hemiptera: Aleyrodidae) containing multiple associated with woody plants in the Americas. Species such as T. perseae and T. ursorum are recognized as agricultural pests of avocado and citrus respectively. The genus is characterized by distinctive wing patterns in and waxy secretions produced by nymphs. Multiple Eretmocerus species (Hymenoptera: Aphelinidae) have been documented as of Tetraleurodes in Mexico.

Identification

possess reddish-brown bands on wings (observed in T. perseae). Nymphs produce white wax lining that forms upward-growing curls around the body; third and fourth instars accumulate from prior on the surface, allowing age determination by counting exuviae. First instar nymphs are mobile and yellow-brown; third and fourth instars are black and immobile.

Habitat

Associated with woody crops and native trees. Documented on avocado (Persea americana) orchards in Mexico and California, and citrus orchards in Tamaulipas, Mexico. In avocado systems, concentrates in the middle stratum of trees at approximately 1.6 m height on buds and young leaves.

Distribution

Native to Latin America; documented in Caribbean, Central America, Florida, Mexico, and California. In Mexico, recorded in Morelos, Tamaulipas, Durango, and San Luis Potosí. Within studied altitudinal ranges in Morelos (1,736–2,230 masl), greater abundance occurs at lower elevations.

Seasonality

Present year-round in tropical and subtropical regions. decrease during rainy season and colder months (June–January), increasing with rising temperatures. time varies with altitude: 11 generations per year at 1,736 masl, 10 at 1,934 masl, and 8 at 2,230 masl in Morelos, Mexico.

Diet

Phloem-feeding on plant vascular tissues. Documented hosts include Persea americana (avocado, Lauraceae) and Citrus spp. (Rutaceae).

Host Associations

  • Persea americana - primary avocado, documented for T. perseae
  • Citrus spp. - documented for T. ursorum
  • Acacia - inferred implied by specific epithet of T. acaciae, not explicitly confirmed

Life Cycle

stage on undersides of young leaves; eggs kidney-shaped. Four nymphal instars: first two instars yellow-brown with first instar mobile; third and fourth instars black and immobile. emerge after fourth instar. Thermal requirement for T. perseae approximately 339.2 heat units with lower threshold temperature of 10°C.

Behavior

First instar nymph is the only mobile stage; later instars remain at feeding sites. are less mobile in early morning hours, facilitating sampling. Nymphs produce characteristic wax secretions forming upward-curling filaments. Adults show positive correlation with vegetative bud availability; nymph abundance negatively correlated with relative humidity.

Ecological Role

Secondary pest of crops. Causes direct damage through phloem feeding on leaves and indirect damage by promoting (Capnodium citri) development on foliage and fruit, reducing photosynthetic capacity and crop vigor. Serves as for multiple including Eretmocerus (Aphelinidae) and Amitus granulosus (Platygastridae). Not currently documented as a virus , though potential risk exists due to high plant circulation in agricultural systems.

Human Relevance

Agricultural pest requiring monitoring and management in avocado and citrus production. and thermal requirements have been studied to inform . of fruit represents significant economic concern in citrus systems, with severity exceeding 80% in heavily infested orchards.

Similar Taxa

  • Bemisia tabaciBoth are whitefly pests with nymphal stages; Tetraleurodes distinguished by wing banding patterns in and characteristic upward-curling wax filaments in nymphs
  • Trialeurodes vaporariorumSimilar greenhouse whitefly pest; Tetraleurodes typically associated with outdoor crops rather than protected , with distinct nymphal wax

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