Abstract
Soil and root samples were collected from December 1987 to February 1989 from 12-yr-old Valencia sweet orange rootstock trials near St. Cloud and Avon Park, FL. Propagule densities of Phytophthora parasitica were determined by plating soil on a selective medium. The lowest populations occurred on the least susceptible trifoliate orange and Swingle citrumelo and the highest on the most susceptible sweet orange, Volkamer lemon, and Palestine sweet lime in the field experiments. Average numbers of propagules per cubic centimeter of soil over this period in the field experiments ranged from 8.3 to 32.2 at St. Cloud and from 5.4 to 14.6 at Avon Park for rootstocks with the lowest and highest populations, respectively, with the highest populations occurring in summer (.)
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