Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: July 28, 2005
Publication Date: August 5, 2005
Citation: Tooley, P.W., Browning, M.E., Kyde, K.L. 2005. The effect of temperature on infection of Rhododendron 'Cunningham's white' by Phytophthora ramorum [abstract]. Phytopathology. 95:S104. Technical Abstract: Whole plants of Rhododendron 'Cunningham's White' were dip-inoculated with 5000 sporangia/ml of P. ramorum California isolate Pr-52 and placed in dew chambers in darkness at 10, 13, 16, 19, 22, 25, 28, and 31 deg C. Two plants were inoculated at each temperature in each of 3 replicate experiments. The numbers of leaves infected by P. ramorum as well as the lesion areas produced were assessed following incubation at the above temperatures for 5 days. Highest percentages of infected leaves per plant were obtained in the range of 16-25 deg C, ranging from 76% at 19 deg C to 92% at 22 deg C. Lowest percentages were obtained at the extremes, 10 deg C and 31 deg C, which showed 18% and 16% infection, respectively. The results indicate that P. ramorum has the capacity to infect some hosts over a wide range of temperatures.