VIEW ARTICLE

Resistance of Biggs Safflower to Phytophthora Root Rot and its Inheritance. C. A. Thomas, Research Plant Pathologist, Crops Research Division, ARS, USDA, Beltsville, Maryland 20705; D. E. Zimmer, Research Plant Pathologist, Crops Research Division, ARS, USDA, Logan, Utah 84321. Phytopathology 60:63-64. Accepted for publication 28 July 1969. DOI: 10.1094/Phyto-60-63.

The safflower cultivar Biggs possesses a high level of resistance to root rot incited by Phytophthora drechsleri. Wound inoculation of hypocotyls of adult greenhouse plants differentiated the high level of resistance of Biggs from lower levels. Performance in field tests indicated that Biggs, unlike other lines and varieties tested, possesses sufficient resistance for production under flood irrigation in some areas. The resistance of Biggs is conditioned by a single recessive factor pair.