Havasi, Mohammadreza, kheradmand, katayoon, Mosallanejad, Hadi, Fathipour, Yaghoub (2020). Influence of low-lethal concentrations of thiamethoxam on biological characteristics of Neoseiulus californicus (Acari: Phytoseiidae). , 9(1), 41-55. doi: 10.48311/jcp.2020.1458
Mohammadreza Havasi; katayoon kheradmand; Hadi Mosallanejad; Yaghoub Fathipour. "Influence of low-lethal concentrations of thiamethoxam on biological characteristics of Neoseiulus californicus (Acari: Phytoseiidae)". , 9, 1, 2020, 41-55. doi: 10.48311/jcp.2020.1458
Havasi, Mohammadreza, kheradmand, katayoon, Mosallanejad, Hadi, Fathipour, Yaghoub (2020). 'Influence of low-lethal concentrations of thiamethoxam on biological characteristics of Neoseiulus californicus (Acari: Phytoseiidae)', , 9(1), pp. 41-55. doi: 10.48311/jcp.2020.1458
Havasi, Mohammadreza, kheradmand, katayoon, Mosallanejad, Hadi, Fathipour, Yaghoub Influence of low-lethal concentrations of thiamethoxam on biological characteristics of Neoseiulus californicus (Acari: Phytoseiidae). , 2020; 9(1): 41-55. doi: 10.48311/jcp.2020.1458

Influence of low-lethal concentrations of thiamethoxam on biological characteristics of Neoseiulus californicus (Acari: Phytoseiidae)

Journal of Crop Protection
Article 4, Volume 9, Issue 1, 2020, Pages 41-55    PDF (551.99 K)
Document Type: Original Research
DOI: 10.48311/jcp.2020.1458
Authors
Mohammadreza Havasi1; katayoon kheradmand* 1; Hadi Mosallanejad2; Yaghoub Fathipour3
1Department of Entomology and Plant Pathology, Aburaihan Campus, University of Tehran, Tehran, Iran.
2Iranian Research Institute of Plant Protection, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran.
3Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran.
Abstract
For successful implementation of integrated pest management (IPM) programs, having knowledge on lethal and low-lethal effects of pesticides on natural enemies is necessary. The present study evaluated the low-lethal effect of thiamethoxam on life table parameters of the subsequent generation of the predatory mite, Neoseiulus californicus McGregor (Acari: Phytoseiidae) fed on Tetranychus urticae Koch under laboratory conditions. The low-lethal concentrations LC5, LC10 and LC20 were determined based on a dose-effect assay. The raw data were analyzed based on age-stage two sex life table analysis. Exposure to the low-lethal concentrations of thiamethoxam had no significant effects on developmental time of offspring of treated mites. Compared with control treatment, the oviposition period of treated mites with LC5, LC10 and LC20 decreased significantly. The highest and lowest values of total fecundity were obtained at control (35.3 eggs/female/day) and LC20 (23.6 eggs /female/day), respectively. The net reproductive rate (R0) decreased with increasing dose from LC5 (22.6 offspring) to LC20 (15.0 offspring). The intrinsic rate of increase (r) and finite rate of increase (λ), were not affected by increasing concentrations. The mean generation time (T) decreased significantly at upper dose (LC20 = 13.2 d), compared with control (14.7 d). In consequence, the low-lethal concentration influences of thiamethoxam in combination with N. californicus in order to design management programs of T. urticae are discussed.
Keywords
predatory mite; LC50; Tetranychus urticae; toxicity; life-table
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