Incidence of powdery mildew (Microsphaera penicillata) and spot anthracnose (Elsinoe corni) was assessed on 37 selections or cultivars of flowering dogwood (Cornus florida), kousa dogwood (C. kousa), hybrid dogwood (C. kousa x florida and C. nuttallii x florida) and giant dogwood (C. controversa). Across all cultivars, the flowering dogwood and C. nuttallii x florida ‘Eddie's White Wonder’ are more susceptible to powdery mildew and spot anthracnose than the kousa, C. kousa x florida hybrids and giant dogwood. Among the cultivars of flowering dogwood screened, ‘Cherokee Brave’, ‘Cherokee Chief’, ‘Welch's Bay Beauty’ and ‘Weaver's White’ were partially to highly resistant to both diseases. With few exceptions, the kousa dogwood and C. kousa x florida hybrids, and giant dogwood suffered very little powdery mildew or spot anthracnose-related damage.
An open-field evaluation of 38 dogwood (Cornus) cultivars was conducted in central Alabama from May 1996 to March 1998. Mortality increased dramatically in giant dogwood (C. controversa Hemsl.), kousa dogwood cultivars (C. kousa Hance), and kousa x flowering dogwood hybrids (C. kousa x florida) from August 1996 to August 1997. Little mortality was observed for the flowering dogwood selections (C. florida L.) during this same period. Further characterization, based on height and stem diameter increases, was conducted on 23 flowering dogwood cultivars. Greatest average annual height and stem diameter increases for cultivars with white bracts and green foliage were observed in ‘Cloud 9’, ‘Fragrant Cloud’, ‘Ozark Spring’, ‘Springtime’, ‘Weaver’, ‘Welch Bay Beauty’, and ‘World's Fair’. Lowest average annual height and stem diameter increases occurred with ‘Autumn Gold’ and Wonderberry®. Among the selections with red or pink bracts and green foliage, ‘Stoke's Pink’ and ‘Welch's Junior Miss’ had greater annual average increases in height and stem diameter than ‘Purple Glory’. Annual average increases in height and final heights were similar among all cultivars with variegated foliage, with ‘First lady’ showing the greatest annual average increase in stem diameter and final stem diameter.
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