Yazar "Sarikaya, Oguzhan" seçeneğine göre listele

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    Can attractant combined yellow sticky traps be used integrated pest management of invasive chestnut gall wasp [Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae)]?
    (Springer Int Publ Ag, 2025) Sarikaya, Oguzhan; Gencal, Tutku; Kadiogullari, Ali Ihsan; Yildiz, Yafes; Sarikaya, Ayse Gul; Gencal, Burhan; Sen, Ismail
    The chestnut gall wasp, Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae), was detected for the first time in Turkiye in 2014. The effectiveness in trapping the chestnut gall wasp by using sticky attractant traps combined with attractants during its active flying period was determined. The combination of yellow sticky traps with a mixture of 90% beer and 10% granulated sugar can have a significant impact on the populations of the pest. This method offers a high success rate in chestnut production regions due to reasons such as their success in attracting chestnut gall wasp adults, the fact that they do not have any negative effects on biological control studies carried out using Torymus sinensis, and offers an effective solution for chestnut gall wasp control without negative effects on nature and the environment.
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    Determining empty seed formation and germination rates induced by Leptoglossus occidentalis (Heidemann) in coniferous species in Turkish forests
    (Springer Heidelberg, 2024) Parlak, Salih; Yilmaz, Mustafa; Akay, Abdullah Emin; Sarikaya, Oguzhan; Acici, Oezden; Can, Hacer; Kalkan, Mehmet
    In recent years, low germination rates have been a problem in the seeds of various coniferous species in Turkey, particularly Turkish red pine (Pinus brutia) and black pine (Pinus nigra), which are commonly used species for afforestation activities. The increase in low germination rates corresponds to the spread of Leptoglossus occidentalis (Heidemann) in coniferous forests, suggesting an investigation of the potential correlation between the spread of this insect and the empty seed formation and germination rates. This study aimed to investigate the main causes of empty seeds and low germination rates induced by L. occidentalis in coniferous species in Turkey. Sample cones were collected from various coniferous species, including fir (Abies spp.), stone pine (Pinus pinea), Turkish red pine (Pinus brutia), spruce (Picea orientalis), cedar (Cedrus libani), maritime pine (Pinus pinaster), black pine (Pinus nigra), and Scots pine (Pinus sylvestris), based on their geographical distribution. The seeds were extracted, and the 1000-seed weights were determined for each species, followed by germination tests conducted under controlled conditions. Statistical analysis revealed significant variations in germination rates between species. Among the eight species examined, Scots pine (Pinus sylvestris) had the highest germination rate of 37.9%, while fir (Abies spp) had the lowest rate of 0.4%. Further analysis showed variations in germination rates based on aspects, with generally higher rates observed in sunny aspects. The results indicated that L. occidentalis caused a significant decrease in seed germination ranging from 60 to 99% in coniferous species and reductions in 1000-seed weights ranging from 19 to 81% among the species, except for Scots pine. The findings highlight widespread germination issues in the seeds of most coniferous trees in Turkey. It was found that L. occidentalis significantly contributes to the formation of empty seeds and lower germination rates in coniferous forests. Therefore, developing strategies to protect and conserve seed resources is essential to mitigate negative impacts on forest resources.
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    Effect of climate change on potential distribution areas of the invasive oak lace bug [Corythucha arcuata (Say, 1832)] (Heteroptera: Tingidae) on oak forests of Turkiye
    (Springer Heidelberg, 2025) Sarikaya, Oguzhan; Gencal, Tutku; Uzun, Almira; Sarikaya, Ayse Gul; Yildiz, Yafes
    This study aimed to model the current and future (2041-2060 and 2081-2100) potential distribution areas of the oak lace bug Corythucha arcuata (Say, 1832) with the HadGEM3-GC31-LL model according to the SSP2 and SSP5 emission scenarios. Pearson correlation analysis was performed to select the bioclimatic data to be included in the model. The following seven climatic variables were used: annual mean temperature, maximum temperature in the warmest month, mean temperature during the wettest quarter, mean temperature during the driest quarter, annual precipitation, precipitation seasonality and precipitation during the driest quarter. The current potential distribution area model for C. arcuata established with the Maxent algorithm shows that this species is concentrated in the Marmara and Black Sea regions. According to the HadGEM3-GC31-LL climate change model and the SSP2-45 scenario, during the 2041-2060 (similar to 2050) period, there will be a general narrowing in the species distribution area, with suitable and highly suitable areas concentrated in some regions of Marmara, along the Black Sea coastline, and in the interior. Therefore, state forestry authorities should implement precautions for this pest in oak stands in northern Turkiye.