Evaluation of Viral Status and Susceptibility of Sweet Cherry Cultivars to Cherry Leaf Spot Blumeriella jaapii (Rehm)
Keywords:
Blumeriella jaapii; cherry; cultivars; susceptibility; virusesAbstract
The aim of this study is to assess the viral status and susceptibility to Blumeriella jaapii of ten new to the region of Kyustendil cherry cultivars grafted on Gisela 5. The investigations were carried out in demonstration cherry orchard at the Institute of Agriculture – Kyustendil, which was planted in spring of 2003 by direct import from Germany of certified virus-tested /vt/ propagated material. In total 65 cherry trees were tested by DAS-ELISA for infection with Prunus necrotic ringspot virus (PNRSV), Prune dwarf virus (PDV), Plum pox virus (PPV), Cherry leaf roll virus (CLRV), Raspberry ringspot virus (RpRSV) and Apple mosaic virus (ApMV) in the spring of 2013. For detection of Аpple chlorotic leaf spot virus (АCLSV) was applied Coctail-ELISA method. The susceptibility of cultivars to B. jaapii is determined by counting the degree of infestation of leaves. The rate of attack was calculated using the formula of Townsent, Heuberger. АCLCV was identified in 4.6% of tested samples. No infection of PNRSV, PDV, CLRV, RpRSV, PPV and ApMV in tested cultivars was detected. All studied cherry cultivars were susceptible to fungal diseases cherry leaf spot caused by B. jaapii. The highly susceptible cultivar is Kordia.
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