Evaluation of Amblyseius swirskii (Acari: Phytoseiidae) as a biological control agent of Iranian false spider mite, Cenopalpus irani Acari: Tenuipalpidae
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عنوان دوره: سومین کنگره بین المللی حشره شناسی ایران
نویسندگان
Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khoramabad, Iran,
چکیده
The phytophagous mite Cenopalpus irani Dosse is an important pest of apple trees that is widely distributed in apple orchards in western regions of Iran. Prey stage preference, functional response, and mutual interference of Amblyseius swirskii Athias-Henriot was evaluated on the pest at 25 ± 1°C, 60 ± 10% RH and 16:8 h L:D on apple leaves. In the prey stage preference tests, 24 h starved female predator was provided with 80 prey i.e. equal number (20) of newly emerged individual eggs, larvae, protonymphs, and deutonymphs of C. irani. To determine the functional response of the predator on of C. irani, 24 h starved female predators were individually exposed to seven densities (2, 4, 8, 16, 32, 64 and 128 newly-emerged individuals) of protonymph. The predator consumed mostly protonymphs (14.33), followed by larvae (12.28) compared with significantly lower consumption of eggs (7.61) and deutonymphs (4.06). The functional response was type II on protonymphs of C. irani. The attack rate and handling time on protonymphs were 0.1186 ± 0.0143 h−1 and 0.6421 ± 0.0215 h, respectively. Moreover, the value of maximum attack rate (T/Th) was estimated to be 37.38 eggs per 24 h. The negative value of the interference coefficient in the mutual interference (-0.287) analysis showed an inverse relationship between the predator density and per capita searching efficiency. The results revealed that A. swirskii could be utilized as an effective predator in the integrated management of C. irani.
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