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Concentration of Safynol in Phytophthora-infected Safflower. C. A. Thomas, Plant Pathologist, Crops Research Division, ARS, USDA, Beltsville, Maryland 20705; E. H. Allen, Biochemist, Crops Research Division, ARS, USDA, Beltsville, Maryland 20705. Phytopathology 60:1153. DOI: 10.1094/Phyto-60-1153.

First internode stem sections of the resistant Biggs line, uniformly infected with Phytophthora drechsleri, contained sufficient safynol 96 hr after inoculation to completely inhibit the pathogen. The concn of safynol in nonpith tissues was 6 times greater than the concn in the pith.