II.51 Reaction of CC XXX-F and an inbred bulk of the world collection to Montana and Middle East isolates of scald.
H.E. Bockleman, R.F. Eslick, and E.L. Sharp, Plant Pathology & Plant & Soil Science Departments, Montanta State University, Bozeman, MT 59715, USA.
A total of 10,700 plants of CC XXX-F were evaluated in a series of seedling tests for reaction to a mixture of isolates of scald (causal organism: Rhynchosporium secalis (Oud.) (Davis) from Montana, Turkey, and Lebanon. Seedlings were inoculated with a water suspension containing approximately 5 x 106 spores/ml 14 days after planting. Temperatures were maintained between 15 and 24°C. Individual plant scald reactions were read 14 days after inoculation. The scald reaction scale is from Schein (Phytopathology 48: 477-480, 1958). Below are number and percent plants in the different classes:
A similar test of 690 plants of a sample of an inbred bulk of the world collection that served as the male to establish CC XXX yielded the following results:
