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    A new species of Aphis Linnaeus, 1758 (Hemiptera: Aphididae) from the northwestern Türkiye with a key to the species of the subgenus Bursaphis Baker, 1934
    (Magnolia Press, 2021) Kok, Sahin; Karabacak, Ersin; Yasar, Ipek; Kasap, Ismail; Barjadze, Shalva
    The new aphid species- Aphis ( Bursaphis ) kazdagensis sp. nov. living on Papaver pilosum subsp. strictum (Papaveraceae) in & Ccedil;anakkale Province, T & uuml;rkiye, is described based on the apterous viviparous females. Diagnosis of the subgenus Bursaphis with respect to other species is given. Aphis popovi Mordvilko, 1932 is transferred from the subgenus Aphis to the subgenus Bursaphis. An updated identification key for apterous viviparous females to all Bursaphis species is provided.
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    Acaricidal Effect of Orange Essential Oil on Two Spotted Spidermite, Tetranychus urticae Koch (Acari: Tetranychidae) under Laboratory Conditions
    (Univ Namik Kemal, 2023) Yasar, Ipek; Kok, Sahin; Kasap, Ismail
    Tetranychus urticae Koch (Acari: Tetranychidae) is one of the phytophagous pests that cause serious economic losses in many cultivated plants. In the control of T. urticae, the use of chemicals usually comes to the fore. However, the use of chemicals in excessive amounts and in inappropriate times and doses causes many negativities because they leave residue and toxic effects on the products. Recently, studies on the effects of extracts obtained from plants on agricultural pests have been increasing day by day and yield successful results. In the study, the effect of an insecticide, which is a commercial formulation of orange oil, on egg laying behavior and acaricidal effect on T. urticae at different doses were investigated. The experiments were carried out in laboratory conditions at 65 +/- 10% humidity and 25 +/- 2 degrees C temperature conditions, on bean leaves, using leaf disc dipping method, using 5 different application doses (0.2, 0.4, 0.6, 1 and 2 ml of 100 ml-1 water) and 5 was carried out recursively. Observations were made at 1, 24, 48, 72 and 96 hours after the application by taking the counts of dead and live individuals. As a result of this study, the highest acaricidal effect on T. urticae individuals was determined with a mortality rate of 75.56% at 2% concentration of orange oil 96 hours after the application. In the 96th hour observations, the lowest acaricidal effect was detected at a concentration of 20% to 0.2%. Accordingly, it was observed that the acaricide effect increased as the concentration and duration of the orange oil studied in the study increased. When the effect of the insecticide with orange oil active substance on the egg laying behavior of T. urticae was examined, the number of eggs in the control group was determined as 99.40 +/- 1.26 at the same observation time, at the 2% concentration of the insecticide used, while 8.80 +/- 1.87 eggs were detected at the end of 96 hours. As a result, the acaricidal effect of orange oil on T. urticae shows that it can be used as an alternative control agent to chemical control.
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    Öğe
    Investigation of the synergistic effect of two predatory mites, Phytoseiulus persimilis and Amblyseius swirskii (Acari: Phytoseiidae), in the biological control of Tetranychus urticae (Acari: Tetranychidae)
    (Taylor & Francis Inc, 2024) Yasar, Ipek; Koek, Sahin; Kasap, Ismail
    Tetranychus urticae (Acari: Tetranychidae) is a polyphagous pest that causes significant economic losses in multiple crop plants. Controlling T. urticae often involves intensive acaricide applications. The use of acaricides also significantly affects human health and ecosystem diversity due to residues and toxic effects in agricultural products. In this study, the efficacy of two predatory mites, Phytoseiulus persimilis and Amblyseius swirskii (Acari: Phytoseiidae), was determined against T. urticae when released as single species and when both species were released together on tomato plants under greenhouse conditions during autumn 2022. The study found that the highest T. urticae density per leaf, with 40.88 +/- 0.79 individuals (eggs + motile) in the control group, was reached at the eighth week. In the same week, the highest impact on T. urticae, with 7.57 +/- 0.42 individuals (eggs + motile), was observed in the treatment group where P. persimilis + A. swirskii were used together, compared to the untreated. According to the current results, the combined use of two predatory species (P. persimilis and A. swirskii) has been found to significantly suppress the population of T. urticae.