Predatory Mites of the Genus Amblyseius (Acari: Phytoseiidae) Associated with Insect Pests in South Gujarat
Abstract
An intensive field investigation was conducted during the year 2024-25 and 2025-26 to study the diversity of predatory mites associated with major agricultural and horticultural insect pests across South Gujarat. The predatory mite family Phytoseiidae emerged as the most dominant and ecologically significant group, represented by a high diversity of species belonging to the genus Amblyseius. During the study period, eight species from genus Amblyseius were identified: Amblyseius channabasavannai, A. largoensis, A. vasiformis, A. multidentatus, A. sacchari, A. gossypii, A. herbicolus and A. longispinosus. These predatory mites were predominantly associated with soft-bodied sucking pests, particularly the whiteflies Bemisia tabaci and Aleurolobus barodensis. The study establishes a critical taxonomic and ecological baseline for deploying these native phytoseiid predators within Integrated Pest Management (IPM) frameworks.
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Introduction
The genus Amblyseius Berlese (Family: Phytoseiidae, Subfamily: Amblyseiinae) represents one of the most species-rich, economically vital and globally distributed groups of predatory mites used in biological pest control. Formally established by Italian entomologist Antonio Berlese in 1914, the genus comprises well over 400 recognized species. Morphologically, these microscopic arachnids are characterized by smooth, lightly sclerotized (hardened) dorsal shields, a characteristically vase-shaped or divided ventrianal shield in females and significantly elongated dorsal setae (specifically the s4, Z4 and Z5 pairs), which facilitate spatial sensing during rapid, agile movement. They possess highly adapted chelicerae with multiple specialized teeth designed to pierce the outer cuticle of soft-bodied agricultural pests, including whitefly nymphs, thrips and phytophagous spider mites (Tetranychidae). Ecologically, the vast majority of species within Amblyseius are classified as Type III generalist predators under the globally recognized phytoseiid lifestyle classification system developed by McMurtry et al. (2013). Unlike strict specialist predators that starve when their primary prey is depleted, Type III generalists are highly adaptable opportunists. They can effectively subsist, develop and reproduce on a broad spectrum of alternative foods, including plant pollen, honeydew, fungal spores and small non-pest micro-arthropods. This generalist feeding strategy allows Amblyseius populations to successfully persist within agri-horticultural ecosystems even during periods of very low target pest densities, making them exceptionally effective at suppressing pest complexes before they can reach economic injury levels. Because of their high reproductive potential, rapid developmental rates and versatile searching behaviour, several key species—such as Amblyseius swirskii Athias-Henriot and Amblyseius largoensis (Muma)—have been extensively mass-reared and integrated into global Integrated Pest Management programs as frontline, sustainable alternatives to synthetic chemical acaricides in both open-field crops and protected greenhouse environments.
Conclusion
Eight distinct predatory species within the genus Amblyseius (A. channabasavannai, A. largoensis, A. vasiformis, A. multidentatus, A. sacchari, A. gossypii, A. herbicolus, and A. longispinosus) were identified and taxonomically characterized. These predatory mites demonstrate strong host preferences for economically damaging whitefly species, including Bemisia tabaci, Aleurolobus barodensis and Aleurothrixus floccosus, across diverse cropping systems. The findings establish a critical taxonomic and ecological baseline for integrating these native phytoseiid predators into Integrated Pest Management (IPM) frameworks in South Gujarat. Future research should focus on evaluating the predatory efficiency, mass-rearing potential, and field efficacy of these species for biological control of whiteflies and other soft-bodied pests.
References
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