Abstract
Abstract Eight wild blackberries, three native Rubus species, and nine Rubus cultivars were surveyed for natural infection with downy mildew (Peronspora sparsa Berk.) in the northern South Island of New Zealand. Most plants were found to be susceptible to infection. ‘Boysenberry’, ‘Youngberry’ and R. cissburiensis fruits and foliage where extremely susceptible. No infection was found on R. echinatus. For field management of bramble crops, wild blackberries (especially R. cissburiensis,) should be eliminated as a source of infection. Development of new disease-resistant cultivars to replace ‘Boysenberry’ and ‘Youngberry’ will make this source of infection from wild blackberries less important.
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