اثر تعداد دوماتیا بر میزان زنده‌مانی لارو شکارهای درون رسته‌ای، Phytoseiulus persimilis و Amblyseius swirskii (Acari: Phytoseiidae)

The plant structures such as domatia could be useful in system stabilities which intraguild predation interactions are current in. In this research, we studied the effect of sweet pepper plant domatia number on the predation rate of two intraguild prey species, i.e Phytoseiulus persimilis Athias-Henriot and Amblyseius swirskii Athias-Henriot. Detached sweet pepper plant leaves (Capsicum annuum var. California wonder, 3 × 3 cm) with 0, 2 and 4 domatia were put on water saturated sponge inside Petri dish (d: 9 cm). An adult female A. swirskii along with 5 same-aged P. persimilis larva, 5 Tetranychus urticae Koch (Acari: Tetranychidae) and 5 T. urticae eggs were added to the experimental unit and considered as treatment. The experimental units were kept under controlled conditions (25 ± 2℃, RH: 65 ± 5%, L: 16, D: 8). The number of consumed larva were recorded after 12 hours and data was analyzed through F test (Tukey Post-hoc test) in SPSS 25. Our results showed that the domatia abundant led to a significant effect on P.persimilis larval predation rate (P < 0.01). The most larval survivorship was recorded on patches with four domatia structures with an average of 2.8 ± 0.26 as consuming rate for P. persimilis and 0.53 ± 0.21 as consuming rate for A. swirskii. The least larval survivement was recorded on patches with 0 domatia with an average of 1.1 ± 0.29 as consuming rate for P. persimilis and 0.13 ± 0.09 for A. swirskii. The P. persimilis larval predation rate was significantly less on patches with four domatia structures in comparison with those with two structures (P < 0.01). While the same comparison for A. swirskii was not significant (P > 0.05). The effect of domatia abundant on the foraging behavior of other phytoseiid species combinations is under investigation.