Clark, Christopher : Christopher Clark is Assistant Professor, Department of Plant Pathology and Crop Physiology, Agricultural Experiment Station, Louisiana State University, Baton Rouge

Constantin, Roysell : Roysell Constantin is Superintendent, Fruit and Truck Station, Hammond, Louisiana

Hammett, Harell : Harrell Hammett is Superintendent, Sweet Potato Research Center, Chase, Louisiana.

Hernandez, Teme P. : Teme P. Hernandez is Professor, Department of Horticulture, Louisiana State University, Baton Rouge

Martin, Weston J. : Weston J. Martin is Professor and Head, Department of Plant Pathology and Crop Physiology, Agricultural Experiment Station, Louisiana State University, Baton Rouge

Scheuerman, Robert W. : Robert W. Scheuerman is Farm Advisor, University of California Cooperative Extension, Merced, California

Director Agricultural Experiment Station POSTAGE PAID University of California U.S . DEPARTMENT OF Berkeley , California 94720 AG RICULTURE ( 2 ) AGR 101 PUBLICATION U Use $ 300 Penalty for Private THIRD CLASS BULK RATE Robert W . Scheuerman Teme P . Hernandez J . Martin Weston Christopher Clark Roysell Constantin HarelI Hammett A sweet potato cultivarresistant to soil rot ( pox ) is being jointly released by the Agricul - of the University tural Experiment Stations of California and Louisiana State University . Formerly tested under the designation LA - 131 , â?? Eurekaâ??was developed by Louisiana State University . â?? Eureka â?? has a copper skin and deep orange flesh , like the â?? Jewel â?? sweet potato cultivar . Roots are well shaped , tapered at both ends , and have a smoother exterior sur - face than â?? Jewel â?? . The vines are trailing , medium to large in thickness , and up to five feet long . Vines and leaf petioles are purplish in color , with green leaves . is equivalent to that of â?? Jewel â?? . percentage of jumbo roots than does Plant production from the fleshy roots is A major advantage of â?? Eurekaâ??is its resis - â?? Eureka â?? . low but can be improved by preheating the tance to the pox organism . It can produce a â?? Eureka â?? is considered a good storage seed roots in storage at 80 â?쳌 to 85 F for three crop in a field severely infested with pox , cultivar similar to â?? Jewel â?? . It has good to four weeks before bedding . For maximum where nonresistant cultivars would be com - and canning characteristics and a baking yields , a growingseason of about 120 days or plete failures . It also has good resistance to dry matter content more is required . of 26.5 percent , which The cultivar was first ( virus ) and to stem rot internal cork made available for testing ( Fusarium wilt ) , and moderate resistance to of â?? Eurekaâ??and â?? Jewel â?? sweet potatoes as affected Yields by soil rot ( pox ) , Livingston , California , 1980 in California pox - infested root knot nematode ( Meloidogynespp . ) . soils in 1977 . Yields of willbe maintained by Louisi - Breeder seed Yields ( MTlha ) â?? ~ ~ â?? Eureka â?? and â?? Jewel â?? were ana StateUniversity AgriculturalExperiment Total sweet marketable potatoes six replicated compared in Station . U.S . # 1 + with trials in Livingston during soil rot canners + 1978 through 1980 . In soils lesions Cultivar US . # 1 Canners jumbo severely infested with the Robert W . Scheuerman is Farm Advisor , Univer - SEVERELY INFESTED FIELD sity of CaliforniaCooperativeExtension , Merced , pox organism , Streptomy - 13.8 6.1 25.1 8.2 Eureka California ; Teme P . Hernandez is Professor , 25.7 ces bomoea ( Person and Jewel 0.06 0.56 0.67 Department of Horticulture , Weston J . Martin is LSD 5 % 4.5 2.4 11.8 7.4 Professor and Head , and Christopher Clark is Martin ) Waks . and Hen - Assistant Professor , Department of Plant Pathol - rici , â?? Eureka â?? consistently ogy and Crop Physiology , Agricultural Experi - LIGHTLY INFESTED FIELD outyielded â?? Jewel â?? . Yields ment Station , Louisiana State University , Baton Eureka Rouge ; Roysell Constantin is Superintendent , were comparable in lightly Jewel Fruit and Truck Station , Hammond . Louisiana ; LSD 5 % 1.68 ( see table ) . infested fields Harrell Hammett is Superintendent , Sweet Potato Research Center , Chase , Louisiana . â?? Jewel â?? produces a higher 24 CALIFORNIA AGRICULTURE , JANUARY - FEBRUARY 1982