Studies of Phytophthora Citricola, Isolated from Persea Americana

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Abstract
Five isolates of Phytophthora from avocado (Persea americana) were studied and compared with phytophthora citricola. In culture the avocado isolates closely resemble P. citricola. Growth at various temperatures is also similar. Sporangia produced by these isolates vary considerably in shape. “Typical” Phytophthora sporangia of the avocado isolates cannot be distinguished from those of authentic P. citricola isolates, including the type culture; irregular sporangia occur among isolates of both groups but there is a greater irregularity of sporangial form among the former. The sexual stage of the avocado isolates appears almost identical with that of P. citricola but oogonia and oospores of the avocado isolates are slightly smaller. Electrophoretic protein patterns of the avocado isolates are similar to those of P. citricola. Based on similarities in all the characteristics studied, the avocado isolates are identified as P. citricola. Phytophthora citricola has limited pathogenicity to avocado roots, but can cause stem cankers when wound-inoculated, and produces a rot on unwounded avocado fruit.

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