Browsing by Author "Mehrkhou, Fariba"

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The Biological and Physiological Responses of Leptinotarsa Decemlineata Say (Col. Chrysomelidae) To Different Potato Cultivars
(John Wiley & Sons Ltd, 2022) Golizadeh, Mahdieh; Mehrkhou, Fariba; Atlihan, Remzi; Guz, Nurper
BACKGROUND The use of pest-resistant or less susceptible plant varieties is of great importance for integrated pest management programs. This study was conducted to evaluate the resistance of seven potato cultivars to a major pest, namely the Colorado potato beetle (CPB), by measuring its bio-physiological aspects. RESULTS The longest developmental time and the lowest survival rate of CPB were detected on cultivar 'Manitou.' Although the larvae fed voraciously, the food conversion efficiency was the lowest on this cultivar leading to the lowest relative growth rate. Furthermore, larvae reared on Manitou had the lowest total protease activity and specific activity values of cathepsin B compared to the larvae reared on other cultivars. Additionally, the cluster analysis showed that the Manitou cultivar was the least suitable (partially resistant) CPB. Moreover, the results indicated that the protein content was the lowest in the Manitou cultivar; conversely, this cultivar was rich in polyphenol and flavonoid compared to Agria and Santae cultivars. CONCLUSION The overall results in this study indicated that the Manitou cultivar might be a good candidate to be incorporated into integrated pest management programs.
The Sublethal Effects of Thiamethoxam-Lambda Cyhalothrin on the Population Growth Performance of the Greenhouse Whitefly, Trialeurodes Vaporariorum, and Its Parasitoid, Encarsia formosa, Under Laboratory Conditions
(Entomological Society of Iran (ESI), 2025) Dadras, Sevda; Mehrkhou, Fariba; Atlihan, Remzi; Fourouzan, Maryam
The greenhouse whitefly, Trialeurodes vaporariorum Westwood (Hemiptera: Aleyrodidae), is one of the most important pests of vegetables and ornamental plants. In this research, the effects of sub-lethal concentration (LC30) of thiamethoxam-lambda cyhalothrin (TLC) on the biological properties, life table parameters and population projection of T. vaporarium and its parasitoid, Encarsia formosa, Gahan were studied at controlled conditions [25 ±2 ℃, R.H. 60 ±10 % and a photoperiod of 16:8 h (L:D)]. Bioassays were conducted by dipping tomato leaves containing third-instar nymphs of the greenhouse whitefly in the obtained LC30 concentration of TLC. The life table data were analyzed using the computer program, TWOSEX–MSChart, based on the age-stage, two-sex life table theory. The results showed that the sublethal concentration of the above-mentioned insecticide had an impact on the population growth of greenhouse whiteflies by shortening their development time and adult lifespan as well reducing their fecundity. The LC30 concentration of TLC had also negative effects on the life history and life table parameters of E. formosa. The results illustrated that the sublethal concentration of TLC resulted in prolonged developmental time, decreased adult longevity, survival rate, and population growth parameters of E. formosa. The population projection results were in accordance with the population growth parameters of the greenhouse whitefly and E. formosa. We concluded that TLC should not be used in integrated pest management programs where E. formosa exists. © 2025 Elsevier B.V., All rights reserved.
Sublethal Effects of Three Insecticides on Fitness Parameters and Population Projection of Brevicoryne Brassicae (Hemiptera: Aphididae)
(Oxford Univ Press inc, 2020) Mahmoodi, Leila; Mehrkhou, Fariba; Guz, Nurper; Forouzan, Maryam; Atlihan, Remzi
The cabbage aphid, Brevicoryne brassicae (L.), is one of the major insect pests of cole crops in Iran. In most instances outbreaks are normally kept under control by application of insecticides. In this study, the sublethal effects (LC30) of three insecticides, acetamiprid, buprofezin, and thiamethoxam-lambda cyhalothrin, (TLC) were evaluated on the population growth rate of the progeny of insecticide-treated cabbage aphid adults. The age-stage, two-sex life table method was used to analyze the collected data. The results indicated that the insecticide applications affected the duration of the preadult period, their survival, reproduction, life span/longevity, and consequently, the population growth rate of the F-1 generation. The indicators of the greatest sublethal effects were noted in the progeny of the TLC-treated adults. These included the lowest net reproductive rate (R-0), intrinsic rate of increase (r), finite rate of increase (lambda), and the longest mean generation time (T). The highest values of r, lambda, R, and the lowest value of T occurred in the control group followed by, in order, the acetamiprid and buprofezin groups. These research findings will be useful in the development and implementation of future aphid management programs.
Sublethal Effects of Two Entomopathogenic Fungi Species, Metarhizium Anisopliae and Beauveria Bassiana, on the Cabbage Aphid (Brevicoryne Brassicae)
(Tubitak Scientific & Technological Research Council Turkey, 2022) Mousavi, Mahdieh; Mehrkhou, Fariba; Guz, Nurper; Goosta, Yobert; Atlihan, Remzi
A We evaluated the sublethal (LC25) effects of the three native strains of two important entomopathogenic fungi (EPFs) species (Metarhizium anisopliae AB, M. anisopliae Iran 245, and Beauveria bassiana 106) on the cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae) which is among the most destructive pests of cole crops. Studies were carried out in controlled conditions providing 25 +/- 2 degrees C, 60% +/- 5% RH and a photoperiod of 16:8 h (L:D). The age-stage, two-sex life table method was used for data analysis. The results indicated that EPF treatments affected the population growth rate of the aphids by causing prolongation of the development time, decrease in survival rate, shortening of adult longevity, and decrease in reproduction. The intrinsic rate of increase (r) and the finite rate of increase (lambda) reflecting combined effects of all life history parameters were the highest in the control group and the lowest in M. anisopliae AB treatment. Similarly, the mean generation time was the shortest in the control treatment and the longest in M. anisopliae AB group. The overall results demonstrated that EPFs tested in this study could be considered an alternative option in the IPM programs against cabbage aphid, and M. anisopliae strain AB is the most promising EPF for further evaluation.