Megalurothrips

Bagnall, 1915

bean flower thrips, oriental bean thrips, Asian bean thrips

Megalurothrips is a of in , established by Bagnall in 1915. The genus contains approximately 15 described distributed across the Old World and Australia. The most economically significant species, Megalurothrips usitatus, is a major pest of leguminous , particularly cowpea, soybean, and common bean, causing damage to flowers and developing pods. Several species have been beyond their ranges, with M. usitatus recently detected in the Americas.

Pronunciation

How to pronounce Megalurothrips: /ˌmɛɡələˈroʊθrɪps/

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Identification

-level identification within Megalurothrips requires examination of antennal segmentation, , and fringes. Megalurothrips usitatus can be distinguished from similar by its relatively large size (3-4 mm) for the , dark body coloration, and association with legume flowers. Molecular identification via COI gene sequencing has been used to confirm species identity in recent .

Habitat

Agricultural and natural environments with leguminous plants. occupy flowers of Fabaceae, with documented associations including soybean, cowpea, adzuki bean, mung bean, pigeon pea, yard-long bean, groundnut, and common bean. occurs in soil, linking the to agricultural field soils.

Distribution

range: Old World and Australia. Megalurothrips usitatus specifically recorded from Asia (Taiwan, China, Cambodia, Sri Lanka), Oceania (New Zealand, Pacific region), Australia, and Africa (Nigeria). range: USA (Florida, 2020), Rica (2021).

Diet

; feeds on legume flowers and developing pods. Specific feeding damage includes flower abortion and reduced pod setting.

Host Associations

Glycine max - feeds onsoybean
Vigna angularis - feeds onadzuki bean
Vigna radiata - feeds onmung bean
Cajanus cajan - feeds onpigeon pea/red gram
Vigna unguiculata subsp. sesquipedalis - feeds onyard-long bean
Vigna unguiculata - feeds oncowpea
Arachis hypogaea - feeds ongroundnut/peanut
Phaseolus vulgaris - feeds oncommon bean

Life Cycle

, larval, pupal, and stages. occurs in soil; soil physical factors influence pupal development. Developmental biology has been studied on soybean in Taiwan.

Behavior

Males produce an that mediates group formation. activity and specific patterns on flowers have been documented. Shows preference hierarchies among available leguminous hosts.

Ecological Role

Agricultural pest causing direct damage to legume reproductive structures. Documented of streak virus in groundnut and other . Serves as for including predatory (Neoseiulus barkeri), predatory (Orius sauteri, Orius maxidentex), and (Ceranisus menes).

Human Relevance

Economic pest of leguminous field with significant yield impacts. Subject of programs using predatory . Recent spread to the Americas (Florida 2020, Rica 2021) has prompted and responses. Biological control with Neoseiulus barkeri has demonstrated comparable efficacy to while preserving higher diversity.

Similar Taxa

FrankliniellaBoth are flower-dwelling ; Megalurothrips distinguished by larger size, legume , and male
Thrips ; Megalurothrips more specialized on Fabaceae and with distinct antennal structure

More Details

Invasive Potential

Megalurothrips usitatus represents an emerging threat to legume agriculture in the Americas, with confirmed establishment in Florida (2020) and Rica (2021). programs are recommended for other bean-producing regions.

Biological Control Compatibility

Field studies demonstrate that predatory releases targeting M. usitatus achieve pest suppression comparable to spinetoram while maintaining significantly higher / diversity and lower dominance in treated fields.