| The effect of Trichoderma harzianum Tr6 on oviposition rate of Phytoseiulus persimilis and Amblyseius swiriskii (Acari: Phytoseiidae) feeding on Tetranychus urticae (Acari: Tetranychidae) on bean plant |
| Paper ID : 1032-IPCA5 (R1) |
| Authors |
|
Roghayeh Gharibreza *1, Azadeh Zahedi Golpayegani2, Alireza Saboori3, Keyvan Behbodi4, helen mohamadi5, Fatemeh Ebadi6 1Department of Plant protection at College of Agriculture and Natural Resources of Universtiy of Tehran, gharibreza.ro@ut.ac.ir 2Department of Plant Protection at College of Agriculture and Natural Resources of University of Tehran. Zahedig@ut.ac.ir 3Department of Plant Protection at College of Agriculture and Natural resources of University of Tehran, Saboori@ut.ac.ir 4Department of Plant Protection at College of Agriculture and Natural Resources of University of Tehran, behbodi@ut.ac.ir 5Department of Plant Protection at College of Agriculture and Natural Resources of University of Tehran, helenmohamadi@ut.ac.ir 6Department of Plant Protection at College of Agriculture and Natural Resources of University of Tehran, ebadi.fatemeh@ut.ac.ir |
| Abstract |
| Soil-borne microorganisms, including fungi, can affect the relationship between plants and arthropods through interactions with roots, in various ways, such as changes in plant defense mechanisms or the enhancement of nutrient absorption. In this study, we examined the oviposition rates of Phytoseiulus persimilis Athias-Henriot and Amblyseius swirskii Athias-Henriot using bean plants incubated with Tetranychus urticae Koch infestations. The bean seeds were divided into three groups. The first group was planted, and after the plants had developed four leaves, they were treated with a suspension of Trichoderma harzianum Tr6 at a concentration of 108. The second group of seeds was treated with the same suspension for 30 minutes before being planted. The third group was simply planted like a normal plant. All the plants were grown under greenhouse conditions (25 ± 5 °C, 60% R.H., and a 16L:8D photoperiodic). Twelve hours before starting the experiment, two ovipositing female T. urticae were placed on each pot to lay eggs, after which they were removed. Female predatory mites of the same age from either predator species were introduced individually into the pots. The pots were then monitored for four days, and the number of eggs laid by each predator species was recorded. The experiment was conducted with 15 replicates per group of seeds, and the data were analyzed using SPSS 16 software and a one-way ANOVA test. Despite the significant effects of T. harzianum Tr6 on strength of the bean plants, the oviposition rates of A. swirskii and P. persimilis on plants treated with the fungus did not show any significant differences (sig = 0.519 and sig = 0.224). The results suggest that treating the plants with Trichoderma harzianum Tr6 did not increase the predation rate of the predators used in this study. Further research would be needed to investigate the effects of T. harzianum Tr6 on other behavioral and biological characteristics of these two predators. |
| Keywords |
| biological control, oviposition, predation, symbiosis, Trichodrema |
| Status: Abstract Accepted |
