Survey of Phytoseiid Mites (Acari: Phytoseiidae) on Almond Trees and Their Predatory Associations with Phytophagous Mites

Abstract

Phytoseiidae (Acari: Mesostigmata) are widely recognized as effective biological control agents of phytophagous mite pests in perennial agroecosystems. The present study was conducted to survey the diversity of phytoseiid mites on almond trees and to assess their predatory associations with phytophagous mites in orchard ecosystems. Field surveys were carried out in major almond-growing regions, where leaf samples were collected periodically from different canopy levels and orchard locations. Mite specimens were extracted using standard leaf washing and brushing techniques and were subsequently mounted and identified under phase-contrast microscopy using morphological keys. The study documented the occurrence of several phytoseiid species associated with almond foliage, indicating a diverse predatory mite community inhabiting the orchard ecosystem. Concurrent observations recorded the presence of phytophagous mites, particularly tetranychid and eriophyid mites, which served as prey for phytoseiids under natural conditions. Predator–prey interactions suggested that phytoseiid mites play a significant role in regulating pest mite populations, thereby contributing to the natural biological control of mite outbreaks in almond orchards. Variations in phytoseiid abundance were observed across sampling locations and seasons, likely influenced by climatic conditions, pesticide applications, and host plant phenology. The findings highlight the ecological importance of phytoseiid mites in maintaining pest equilibrium and reducing reliance on chemical acaricides. This study provides baseline faunistic information on phytoseiid diversity in almond ecosystems and emphasizes their potential integration into sustainable pest management programs. Conservation of these natural enemies through habitat management and judicious pesticide use can enhance their effectiveness in suppressing phytophagous mite populations and improving almond productivity.