Abstract
Isolations were made from blighted pigeon-pea (Cajanus cajan) plants from different locations in India. A species of Phytophthora was consistently obtained from these locations and was proved to be the causal organism involved in the disease. Based on the sporangium shape and size, oogonium and oospore formation, temperature requirements, and pathogenicity tests, we have classified these isolates as P. drechsleri f. sp. cajani. The use of formae speciales was considered appropriate because of the specificity of these isolates to pigeon pea and Atylosia spp., wild relatives of the pigeon pea.
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