The predation rate of Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae) on Tetranychus urticae Koch (Acari: Tetranychidae) and Bemisia tabaci Gennadius (Hem: Aleyrodidae)
عنوان دوره: اولین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
The predatory mite, Amblyseius swirskii is one of the most important predators of Tetranychus urticae and Bemisia tabaci. Its role in reducing population of these pests can be expected to be more useful so for studies of natural enemies performance. In this research, we investigated and compared the predation rate of the predatory mite under controlled conditions (25±2 ºC, 16L: 8D h photoperiod, 70±5% RH) when received egg, first and second instar nymphs related to each of the prey species. 30 preys and same aged females of A. swirskii straved for 24 h were added to a bean leaf disc (2.5×2.5 cm2) in 20 replicates. The number of consumed egg, first and second instar nymphs of T. urticae and B. tabaci were 17±0.74, 7±0.48 and 7±0.28, 5±0.23 and 5±0.18, 1±0.18, respectively. Amblyseius swirskii females consumed significantly more eggs than first instar nymphs, eggs and second instar nymphs, first and second instar nymphs of T. urticae (P < 0.0001). Also A. swirskii females consumed significantly more eggs than second instar nymphs, first instar nymph and second instar nymphs of B. tabaci (P < 0.0001). There was also significant difference between eggs and first instar nymphs of B. tabaci fed by the predatory mite (P = 0.047). Therefore, prey stage of can considerably influence on the predation of A. swirskii. These findings can be useful in mass rearing programs of A. swirskii.
کلیدواژه ها