![]() ![]() There was also a strong relationship between the racial background of the female parent and the tolerance of seedlings. Although the most susceptible families developed mean disease ratings of up to 97% root necrosis, mean ratings for the most tolerant families were less than 60%. Most seedlings developed severe root rot, but tolerance was observed in some families ( i.e., progeny of certain accessions). ![]() From 1996 to 1998, a total of 2,355 seedlings from 51 accessions were examined in potting mix artificially infested with P. In an attempt to identify root rot-resistant rootstocks that could ultimately be used under conditions in southern Florida, we screened open-pollinated progeny of avocado from the National Germplasm Repository in Miami. Phytophthora root rot, caused by Phytophthora cinnamomi Rands, is the most important disease of avocado ( Persea americana Miller). ![]()
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