Akademik Veri Yönetim Sistemi
Integrated Control of Plant-Feeding Mites, İzmir, Türkiye, 8 - 11 Eylül 2025, ss.16-17, (Özet Bildiri)
This study aimed to evaluate the predation capacity of two predatory mite species, Galendromus occidentalis (Nesbitt) and Neoseiulus californicus (McGregor), on various developmental stages (egg, larva, protonymph and adult) and densities of the two-spotted spider mite (Tetranychus urticae Koch) under controlled conditions (26±1 ºC, 65±5% RH, and 16:8h light:dark). Experiments were conducted using two strawberry cultivars (cv.), Camarosa (commercial) and Osmanlı (local), as host plants. Six different prey densities were used for each developmental stage. These prey densities ranged from 5 to 40, 5 to 30, and 3 to 30 individuals for the egg, larva and protonymph, and adult female stages, respectively. The results showed that the predation capacity of both N. californicus and G. occidentalis increased significantly with higher prey densities. In general, both predators exhibited higher predation rates on the cv. Camarosa. N. californicus was more efficient, particularly against the adult stage of T. urticae, compared to G. occidentalis. The highest average number of consumed adults was recorded for N. californicus on Camarosa at 5.56 individuals/day, while G. occidentalis reached 5.13 individuals/day. Both predatory mite species were also effective against egg, larval, and protonymph stages, with consumption rates rising in parallel with prey density. These findings suggest that N. californicus and G. occidentalis are effective biological control agents against T. urticae, and their predation capacities may vary depending on the host plant cultivar and the developmental stage of the pest.
Keywords: Tetranychus urticae, Neoseiulus californicus, Galendromus occidentalis,
biological control, strawberry