اثر وجود یا عدم وجود دوماتیا بر زنده‌مانی لارو شکارهای درون رسته‌ای،‌ Phytoseiulus persimilis و Amblyseius swirskii (Acari: Phytoseiidae)

The domatia presence on the underside of sweet pepper plant leaves leads to the reduction of predation rate on intraguild larva. In this research, we studied the effect of such a structure presence or absence on two specialist and generalist intraguild prey larva predation rate, Phytoseiulus persimilis Athias-Henriot and Amblyseius swirskii Athias-Henriot. A detached sweet pepper plant (Capsicum annuum var. California wonder, 2.5 × 2.5 cm) was put inside a munger-cell (d: 2.5 × 2.5 cm) experimental unit. An adult A. swirskii female along with 7 same- aged P. persimilis larva were added to the munger-cell and considered as treatment. While either the presence or absence of domatia was considered as the independent variable in this experiment, the domatia on control units were omitted using small liquid adhesive drops. In order to limit any probable effect of adhesive odor, the same drops were used on treatment patches with natural domatia (25 ± 2℃, RH: 65 ± 5%, L: 16, D: 8). Data - the consumed intraguild prey numbers 10 hours later - was recorded and analyzed through independent t test in SPSS 25. Our results showed that the domatia presence led to a significant increase (P < 0.05; 3.66± 0.3 against 4.9± 0.3) in P. persimilis larval survivorship, while such an effect was not recorded for A. swirskii larva (P > 0.05; 0.2 ± 0.1 against 0.06 ± 0.05). We suggest that the domatia presence could influence on reducing the damages resulted from IGP interactions. Such an affect could be dependent on the aggression level and the type of predator life style. The effect of domatia presence/ absence on the behavior of other phytoseiid species combination is under investigation.