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    Incidence and diversity of plant-parasitic nematodes associated with wheat-cropping systems in the inner part of the Aegean Region of Turkey
    (Brill, 2023) Duman, Nagihan; Yıldız, Şenol; İmren, Mustafa; Yüksel, Ebubekir; Öcal, Atilla; Dinçer, Dilek
    Plant-parasitic nematodes are among the most influential soil organisms worldwide and have a detrimental impact on wheat productivity; they also play a major role in maintaining soil diversity. However, limited information is available on the biodiversity of nematodes associated with wheat cropping systems in Turkey. To address this knowledge gap, 45 wheat fields in the Afyonkarahisar Province of Turkey were sampled in 2021 in order to extract and identify nematodes. A total of 14 genera and 44 species of these nematodes were identified based on their physical traits and ITS DNA sequences examination. Shannon diversity index was used to determine the prevalence and biodiversity features of these nematodes. This study represents the first comprehensive research on plant parasitic nematodes from wheat-growing regions in the Afyonkarahisar Province. The genera Helicotylenchus, Heterodera, Merlinius, Pratylenchoides and Pratylenchus dominated with a high relative abundance percentage >60%, and were extremely common (>90% for each). The average Shannon index of nematode species in the wheat fields was 2.20, with an evenness value of 0.81, indicating moderate diversification and good nematode evenness. This study also revealed a significant correlation between nematode genus biodiversity and edaphic, climatic and geographical factors. Finally, this research demonstrated a remarkable diversity of soil nematodes associated with wheat crops and they have the potential to be useful tools for extensive soil bio-study.
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    Molecular identification and biodiversity of wireworm species, Agriotes spp. Eschscholtz, 1829 (Coleoptera: Elateridae) in major potato cultivated areas of Turkiye
    (Entomological Soc Turkey, Ege Univ, 2023) Askar, Arife Gümüş; Yüksel, Ebubekir; Dinçer, Dilek; Özer, Göksel; İmren, Mustafa; Canhilal, Ramazan; Kütük, Halil
    Wireworms, Agriotes spp. Eschscholtz, 1829 (Coleoptera: Elateridae) are among the most harmful soil-borne insect pests and significantly reduce potato yields under heavy infestations. The presence of wireworm species on potatoes in potato growing areas is not fully known in the provinces of Turkiye. Therefore, this research aimed to identify wireworms molecularly and evaluate their biodiversity in potato growing ecosystems. Here, the first extensive field survey was carried out in Turkiye's principal potato-growing regions in 2019 and 2020 (Afyon, Bolu, Izmir, Kayseri, Konya, Nigde, and Sivas). Species identification of wireworms was performed using DNA barcoding approach based on the fragment of mitochondrial cytochrome c oxidase subunit I (COI). Samples were collected from 400 potato fields, and 510 larval specimens were obtained. The presence of wireworms was confirmed for Afyon, Bolu, Kayseri, Konya, and Sivas provinces, with an average prevalence of 13.5%, while no positive samples were recovered from Nigde and Izmir. Agriotes sputator (L.,1758) (Coleoptera: Elateridae) was the most prevalent species in surveyed areas. The Shannon index of wireworm species was found to be as 0.59, which implies a low degree of biodiversity of wireworms in potato fields.
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    A study on the presence of potato cyst nematodes: globodera rostochiensis (Wollenweber, 1923) Skarbilovich, 1959 and Globodera Pallida Stone 1973 (Tylenchida: Heteroderidae) in Nevşehir province, Turkey
    (2019) Özarslandan, Adem; Dinçer, Dilek; Bozbuğa, Refik; İmren, Mustafa; Elekçioğlu, İbrahim Halil
    Potato (Solanum tuberosum L.) cyst nematodes (Globodera rostochiensis (Wollenweber) and Globodera pallida (Stone) cause significant yield losses and have been listed as quarantine pests for many countries in the world including Turkey, and the European and Mediterranean Plant Protection Organization (EPPO, A2). In Turkey, the current potato production area is decreasing due to contamination by quarantine agents, and new fields are under threat of invasion by new quarantine organisms. In this study, samples were collected from Nevşehir province, Turkey, in potato growing fields during the spring growing season in 2014-2015. Soil samples were washed using Fenwick’s can and cysts were extracted and identified using molecular markers. The species-specific molecular markers generated a 435 bp using PITSr3, PITSp4 and ITS5 primers. The potato golden cyst nematode, G. rostochiensis was identified in Nevşehir potato production areas and this is the first report for the Central Anatolia Region. In addition, G. rostochiensis was found in two samples of the same field in the surveys. The average cyst nematode density was determined as 60 cysts in 250 g soil.