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Amaç: Çalışmada Hatay’ın İskenderun ilçesinde Mayıs 2019 tarihinde ceviz bahçelerdeki ceviz ağaçlarında, iletim dokularında kahverengi-koyu kahverengi renk değişikliği, odun dokusu nekrozu ve dallarda geriye doğru ölüm hastalık belirtilerine neden olan fungal etmenin tanılanması ve etmenin bazı fungisitlere karşı duyarlılık düzeylerinin belirlenmesi amaçlanmıştır. Yöntem ve Bulgular: Hastalıklı dallardan, kanserlerden ve belirti göstermeyen ceviz örneklerinden yapılan izolasyonlar sonucunda elde edilen fungal izolat morfolojik ve moleküler çalışmalara göre Botryosphaeria dothidea olarak tanılanmıştır. Patojenisite denemeleri, fungal izolatın bölgede yetiştirilen Chandler çeşidi ceviz ağacı sürgünlerinde oldukça virülent olduğunu göstermiştir. Mevcut bilgilerimize göre bu çalışma, Türkiye’de cevizi enfekte eden Botryosphaeria dothidea’nın ilk raporudur. Fluazinam (0.001-0.015 µg/ml), thiophanate-methyl (0.1-10.0 µg/ml), boscalid + pyraclostrobin (1.0-50.0 µg/ml), trifloxystrobin (0.5-50.0 µg/ml), kresoxim-methyl (0.1-50.0 µg/ml) ve tebuconazole (0.5-50.0 µg/ml) gibi 6 farklı fungisitin farklı konsantrasyonlarının, fungal etmene karşı in vitro antifungal etkileri belirlenmiştir. Fungisitlerin ortalama etkili konsantrasyon (EC50) değerleri, Probit analiziyle belirlenmiştir. Hesaplanan EC50 değerlerine göre hastalık etmenine karşı en etkili fungisit fluazinam (0.002 µg/ml) olarak kaydedilmiş olup, bu fungisiti thiophanate-methyl (0.275 µg/ml), tebuconazole (0.994 µg/ml), boscalid + pyraclostrobin (3.993 µg/ml) ve trifloxystrobin (4.262 µg/ml) izlemiştir. En düşük antifungal etkinlik fungisitler arasında misel gelişimini %37.5 oranında engelleyen kresoxim-methyl tarafından gösterilmiştir. Genel Yorum: Bu çalışma fungal etmen Botryosphaeria dothidea’nın Türkiye’de yetiştirilen ceviz ağaçlarında gövde kanseri hastalığa neden olduğunun ilk kayıdıdır. Elde edilen sonuçlar ayrıca Botryosphaeria dothidea’nın sebep olduğu ceviz kanser hastalığının seçilen fungisitlerin uygulanmasıyla ağaçların hastalıktan korunabileceğini önermektedir. Çalışmanın Önemi ve Etkisi: Sonuç olarak, fluazinam, thiophanate-methyl ve tebuconazole’ün fungal patojen B. dothidea’nın kontrolünde kullanım potansiyeli bulunduğunu ortaya koymaktadır.
Purpose: In the study in Hatay's Alexandria district in May 2019 in the coconut gardens, the transmitting tissue has a brown-dark brown color change, wood tissue necrosis and rivers have the aim to identify and determine the levels of sensitivity to some fungicides of the fungal that causes signs of death. Method and findings: The fungal isolate obtained from isolations from ill branches, cancers and non-symptomatic coconut samples is known as Botryosphaeria dothidea according to morphological and molecular studies. Pathogenicity trials have shown that fungal insulate is quite virulent in the Chandler species planted in the area. According to our current information, this study is the first report of Botryosphaeria dothidea infected with coconut in Turkey. In vitro antifungal effects of 6 different concentrations of fungicitis, such as fluazin (0.001-0.015 μg/ml), thiophanate-methyl (0.1-10.0 μg/ml), boscalide + pyraclostrobin (1.0-50.0 μg/ml), trifloxystrobin (0.5-50.0 μg/ml), kresoxim-methyl (0.1-50.0 μg/ml) and tebuconazole (0.5-50.0 μg/ml), against fungalation have been determined. The average effective concentration (EC50) values of fungicides are determined by Probit analysis. According to calculated EC50 values, the most effective fungicide against the pathogen is fluazinam (0.002 μg/ml), this fungicide is thiophanate-methyl (0.275 μg/ml), tebuconazole (0.994 μg/ml), boscalide + pyraclostrobin (3. 993 μg/ml) and trifloxystrobin (4.262 μg/ml) were followed. The lowest antifungal effect was demonstrated by kresoxim-methyl, which prevents the development of fungicides by 37.5%. This study is the first record that the fungal agent Botryosphaeria dothidea caused body cancer in coconut trees grown in Turkey. The results also suggest that the trees can be protected from the disease by the application of selected fungicides of the cabbage cancer caused by Botryosphaeria dothidea. The importance and effect of the study: As a result, it shows that fluazinam, thiophanate-methyl and tebuconazole have a potential for use under the control of the fungal pathogen B. dothidea.
Aims: Symptoms of canker disease on walnut trees included brown to dark brown discoloration of vascular tissues, wood necrosis, and branch dieback were observed in several orchards in İskenderun City of Hatay Province in May 2018. The aims of this study were to identify the fungal pathogen and to determine its sensitivities against some fungicides. Methods and Results: Isolations were made from diseased branches, cankers and asymptomatic walnut samples and causal disease agent was identified as Botryosphaeria dothidea based on morphological characteristics and molecular techniques. Pathogenicity tests showed that fungal isolate were highly virulent on shoots of walnut (cv. Chandler) trees commonly grown in the region. To our knowledge, this is the first report of Botryosphaeria dothidea infecting walnut in Turkey. In vitro antifungal effect of different concentrations of six fungicides, fluazinam (0.001-0.015 µg/ml), thiophanate-methyl (0.1-10.0), boscalid + pyraclostrobin (1.0-50.0 µg/ml), trifloxystrobin (0.5-50.0 µg/ml), kresoxim-methyl (0.1-50.0), and tebuconazole (0.5-50.0 µg/ml) were also evaluated against the pathogen. The mean effective concentration (EC50) values were determined by Probit analysis. According to EC50 values, fluazinam (0.002 µg/ml) was recorded as the most effective fungicide and it was followed by thiophanate-methyl (0.275 µg/ml), tebuconazole (0.994 µg/ml), boscalid + pyraclostrobin (3.993 µg/ml) and trifloxystrobin (4.262 µg/ml). The lowest antifungal efficacy was followed by kresoxim-methly inhibiting mycelial growth by 37.5% at the highest concentration used. Conclusions: To our knowledge, this is the first report of Botryosphaeria dothidea causing stem canker diseases on walnut trees grown in Turkey. Our results also suggest that the walnut canker disease caused by Botryosphaeria dothidea could be reduced effectively with the application of selected fungicides. Significance and Impact of the Study: In conclusion, our results suggest that fluazinam, thiophanate-methyl and tebuconazole have the potential effects to control Botryosphaeria dothidea.
Alan : Ziraat, Orman ve Su Ürünleri
Dergi Türü : Ulusal
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