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    DETERMINATION OF INCIDENCE AND IDENTIFICATION OF POWDERY MILDEW PATHOGEN IN QUINCE ORCHARDS IN EAST MARMARA REGION
    (Publ House Bulgarian Acad Sci, 2021) Erdogdu, Hakan; Altin, Nedim
    Quince is one of the most important fruit products of East Marmara Region. In recent years, powdery mildew disease has begun to cause problems in quince orchards. This study was carried out to determine the incidence, disease severity and prevalence of powdery mildew disease in quince orchards of Sakarya, Bursa, Bilecik and Kocaeli in the year 2017. During the survey studies, 119 samples were made in 105.8 ha quince orchards. In the survey, approximately 3% of the total quince orchards in the region were examined. Samplings were carried out in August. Ten trees were selected randomly from the field making an 'X' shape in field. Twenty shoots were selected from 10 trees (two shoots from each tree). From each of these shoots, five leaves were selected and disease incidence on these was evaluated using a 0-6 scale. As a result of the morphological and molecular identification study, it was determined that the pathogen that caused powdery mildew in quince orchards is Podosphaera clandestina. As a result of the evaluations, the prevalence, incidence and disease severity of powdery mildew disease in quince orchards were determined as 100%, 83.07%, 36.92%, in Sakarya province, 93.58%, 55.38%, 23.92% in Bursa province, 100%, 44.67%, 11.83% in Bilecik province and 100%, 83.25 %, 28.50% in Kocaeli province, respectively.