Browsing by Author "Kacar, Oya"

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    A laboratory study of the acaricidal, repellent and oviposition deterrent effects of three botanical oils on Tetranychus urticae (Koch, 1836) (Acari: Tetranychidae)
    (Ege Üniversitesi, 2020-04-25) Keskin, Gizem; Kumral, Nabi Alper; Kacar, Oya; Keskin, Gizem; KUMRAL, NABİ ALPER; KAÇAR, OYA; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Entomoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Bitki Koruma Bölümü.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Tarla Bitkileri Bölümü.; 0000-0001-9442-483X; A-1388-2019; AAG-7449-2021; KGA-9390-2024
    The biological activities of essential oil obtained from water distillation process of basil leaves [Ocimum basilicum L. (Lamiales: Lamiaceae)] cv Round Midnight and crude oil obtained from the cold-pressed process of chinaberry tree seeds [Melia azedarach L. (Sapindales: Meliaceae)] and a commercial neem oil product (Nimbecidine) [Azadirachta indica (A. Juss, 1830) (Sapindales: Meliaceae)] were assessed against two-spotted spider mites, Tetranychus urticae (Koch, 1836) (Atari: Tetranychidae) using a residual method on leaf disc under laboratory conditions at Bursa Uludag University during 2018-2019. The lethal concentrations (LC50 and LC90) of Nimbecidine, chinaberry and basil oils were estimated as 0.8 and 1.8 mg/L, 4.0 and 6.9%, 5.4 and 11.7%, respectively, 72 h after treatment. The lethal times (LT50 and LT90) of Nimbecidine (1 mg/L), chinaberry (6%) and the basil (8.4%) were 64 and 107 h, 41 and 73 h, 65 and 110 h, respectively. The females had a strong aversion to bean leaf surfaces sprayed with the sublethal concentrations of Nimbecidine (0.125-0.75 mg/L), chinaberry (0.75-3%) and basil (0.7-1.4%) oils. Significant decreases were recorded in the number of eggs laid on bean leaves sprayed with the sublethal concentrations for Nimbecidine (0.031-0.5 mg/L), chinaberry (0.75-3%) and the basil (1.4-5.6%) oils compared with unsprayed bean leaves. The study showed that the assessed concentrations of the oils obtained from the basil and chinaberry compared to the commercial botanical product (Nimbecidine) have similar biological effects on T. urticae.
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    Publication
    Discrimination of thymus, origanum, satureja and thymbra species from the family labiatae by untargeted metabolomic analysis
    (Czech Academy Agricultural Sciences, 2020-01-01) Güzelsoy, Nurcan Aysar; Çavuş, Filiz; Kacar, Oya; Bursa Uludağ Üniversitesi/Ziraat Fakültesi.; AAG-7449-2021
    The term "thyme" does not refer to herbs that belong to a single species. The genera 'Thymus, Origanum, Satureja and Thymbra of the family Labiatae are traditionally named as thyme and locally known as 'kekik: Unlike Turkey, these species are globally called differently. Spices made of Origanum, Thymus and Satureja are called oregano, thyme and savory, respectively. It is often difficult to differentiate them because of their similar smell and appearance. Most commercial products traded as a mixture of those genera and the mixing together of different species may lead to economically motivated adulteration and a product of reduced value. The species were analysed by LC-ESI-QTOF-MS and a comprehensive statistical workflow was designed. The data of methanolic extracts were assessed and an extraction algorithm was employed for the processing of raw data. Five species were discriminated using principal component analysis (PCA) and hierarchical cluster analysis (HCA). The results of PCA and HCA were consistent with each other. Twenty-one metabolites were determined for the discrimination.