Amitus

Haldeman, 1850

Amitus is a of in the Platygastridae, containing at least 16 described . Species in this genus are primarily known as agents of whiteflies (Aleyrodidae), with several species introduced internationally for pest management. Notable species include A. hesperidum, an effective parasitoid of citrus blackfly introduced to multiple countries; A. fuscipennis, used against greenhouse whitefly; and A. bennetti, a parasitoid of silverleaf whitefly.

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Pronunciation

How to pronounce Amitus: /ˈæmɪtəs/

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Habitat

Associated with agricultural and horticultural systems where whitefly occur, including citrus groves, tea gardens, greenhouses, and bean fields. Specific preferences vary by and host association.

Distribution

occur across multiple continents including Asia (type locality of A. hesperidum in Hong Kong and Singapore), the Americas (Mexico, Texas, Florida, South America), and have been introduced to regions outside native ranges for purposes.

Host Associations

Life Cycle

Development is temperature-dependent. For A. fuscipennis, development ranges from 61 days at 15°C to 22 days at 30°C. For A. bennetti, development time decreases from 72 days at 15°C to 28 days at 25°C, requiring approximately 400 with a development threshold of 10°C. are pro-ovigenic, emerging with lifetime load ready to oviposit.

Behavior

Females are attracted to -induced plant volatiles; A. hesperidum is specifically attracted to the tea plant synomone (E,E)-α-farnesene. Searching involves (comprising 61% of time budget), host drumming and probing, and area-restricted searching after . Oviposition typically targets first instar nymphs. A. fuscipennis disperses up to 12 meters with wind-assisted passive , showing preference for downwind movement.

Ecological Role

agent of whitefly pests in agricultural systems. have been introduced to new regions (Mexico, Texas, Florida, Dominica) for of whiteflies. Can significantly reduce pest , with field studies showing rates 2.25 times higher in treated versus control areas.

Human Relevance

Important agents used in programs. A. hesperidum successfully established in multiple countries for citrus blackfly control. A. fuscipennis evaluated for greenhouse whitefly management. A. bennetti assessed for silverleaf whitefly control in cotton and bean crops. Synomone-based attractants developed to enhance efficacy in tea production systems.

Similar Taxa

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Notable species

A. hesperidum: described by Silvestri in 1927, introduced from India to Mexico, Texas, and Florida for citrus blackfly control. A. fuscipennis: described by MacGown & Nebeker in 1978, studied extensively for greenhouse whitefly in Colombia. A. bennetti: described by Viggiani & Evans, of silverleaf whitefly with extended development time compared to other whitefly parasitoids.

Reproductive biology

Pro-ovigenic strategy with high ; A. fuscipennis produces 338-430 per female at optimal temperatures (15-25°C), with maximum oviposition on first day after . longevity reduced when present (5-8 days) versus without hosts (19-29 days).

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