Pathogenicity of fungi associated with brown spot and leaf necrosis of Hydrangea macrophylla (big leaf Hydrangea) in Uyo, South-South, Nigeria
Journal Title: Journal of Research in Ecology - Year 2018, Vol 6, Issue 1
Abstract
Disease incidence surveys were carried out on brown spot and leaf necrosis of Hydrangea macrophylla between July and September; 2014.The symptoms observed in the field were brown spot which was circular or slightly irregular in shape and somewhat sunken on the flesh leaves of H. macrophylla. The center of the spot was about 1 inch in diameter. Symptoms observed in the field include circular brown spot found predominately at the base of the leaf of H. macrophylla. The spot slowly turns tan to somewhat light grey encircled by a purple halo. The spot was about one eighth to one fourth inch in diameter. The infected H. macrophylla samples were placed on the potato Dextrose Agar (PDA) and moist chamber. The results showed that Colletotrichum gloeosporioides was the most frequently isolated organism on the infected H. macrophylla leaves with percentage frequencies of occurrence of (90.0%), while Cercospora hydrangea had (10.0%) frequency of occurrence. Pathogenicity on susceptible H. macrophylla using all the fungal isolates, showed that C. gloeosporioides incited brown spot and leaf necrosis of H. macrophylla in this study. The other fungi isolated also may have synergized the disease development in this study
Authors and Affiliations
Andrew DE, Akpan EA
Keywords
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