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Published in Crop Sci 21:226-229 (1981)
© 1981 Crop Science Society of America
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Evaluation of the World Safflower Collection for Resistance to Phytophthora1

D. J. Da Via, P. F. Knowles and J. M. Klisiewicz2

The World Safflower (Carthamus tinctorius L.) Collection was tested 5 years in the field for resistance to root rot induced primarily by Phytophthora drechsleri Tucker, P. parasitica Dast., and P. cryptogea Pethyb. and Laff. Resistance of 1,547 entries of the World Safflower Collection obtained from 35 different countries was evaluated. Nurseries were planted on a heavy clay soil following a crop of rice (Oryza saliva L.). In order to maximize disease incidence, plants were stressed for water prior to flood irrigation. Disease readings were made 10 to 20 days after irrigation. Seeds (achenes) from individual open-pollinated plants which appeared resistant were harvested and planted the following year. After 5 years of testing, 15 of the most resistant lines which had been originally obtained from the following countries were released: Turkey, five; Egypt, Afghanistan, and Iran, two each; Sudan, India, Iraq, and Australia, one each. The released genotypes were designated UC-150 to UC-164, respectively.

Key Words: Carthamus tinctorius L. • Root rot • Germplasm • Disease screening • Phytophthora drechsleri • P. parasitica • P. cryptogea

1 Contribution from the Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616 and the USDA-SEA, AR, Davis, CA 95616.

2 Formerly staff research associate Agronomy and Range Science Dep., now international agronomist, SeedTec International Inc., Woodland, CA; professor of agronomy, Agronomy and Range Science Dep.; and plant pathologist USDA-SEA, AR, Dep. of Plant Pathology, Univ. of California, Davis, CA 95616.

Received for publication September 24, 1979.




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