TAILIEUCHUNG - Sensitivity of Cercospora beticola populations in Turkey to utriafol, mancozeb, and fentin acetate

The sensitivity of sugar beet leaf spot disease caused by Cercospora beticola to fungicides used in Turkey was determined using a mycelial growth assay in petri dishes with 100 fungal isolates. The isolates were obtained from samples collected from 6 sugar beet production areas in 2005 and 2006. | Research Article Turk J Agric For 35 (2011) 65-71 © TÜBİTAK doi: Sensitivity of Cercospora beticola populations in Turkey to flutriafol, mancozeb, and fentin acetate Aynur ÇOLAK TÜMBEK1, Pınar ÖZEREN2, Rıza KAYA3, Yakup Zekai KATIRCIOĞLU2, Salih MADEN2 1 Tarım Kredi Kooperatifi, Buharkent, Aydın - TURKEY 2Ankara University, Faculty of Agriculture, Department of Plant Protection, 06110 Dışkapı, Ankara - TURKEY 3Sugar Institute, 06930 Etimesgut, Ankara - TURKEY Received: Abstract: The sensitivity of sugar beet leaf spot disease caused by Cercospora beticola to fungicides used in Turkey was determined using a mycelial growth assay in petri dishes with 100 fungal isolates. The isolates were obtained from samples collected from 6 sugar beet production areas in 2005 and 2006. Flutriafol, mancozeb, and fentin acetate were added to Aspergillus complete medium (ACM) at the rates of , , , , , , and µg mL-1, and then mycelial growth was measured. ED50 values of flutriafol for all the isolates from the sugar beet production areas ranged from to > µg mL-1. Tolerance to this fungicide was very high in 2 regions (Adapazarı and Çarşamba) where the disease is very prevalent due to climatic conditions. In these 2 areas , , , and of the isolates grew with 5 and 10 -1 -1 µg mL of flutriafol, respectively (1 µg mL flutriafol is considered inhibitory to the growth of the fungus). In the other 4 regions included in the study, tolerance was not as high. Tolerance to mancozeb developed in all the regions; however, the percentage of tolerant isolates was lowest in Çarşamba (6%) and highest in Susurluk (). Tolerance to fentin acetate varied according to the criteria used for evaluation. Key words: Cercospora beticola, fentin acetate, flutriafol, fungicide resistance, mancozeb Türkiye’de Cercospora beticola popülasyonlarının flutriafol, mancozeb ve fentin acetate’a duyarlılıkları Özet: Cercospora .

• Nông nghiệp
• Cercospora beticola
• Fentin–asetat
• Fungisit dayanıklılığı
• Mycelial growth
• Mancozeb developed