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- Author or Editor: Robert W. Scheuerman x
Clones of ‘Jewel’, ‘Eureka’, ‘Pope’, ‘Oklamex’, ‘Garnet’, L5-19, NC-719, and W-152 sweet potato [Ipomoea batatas (L.) Lam] were tested for 1 to 3 seasons in field plots of coarse-textured sand soils. The soils were infested with Meloidogyne incognita (Kofoid & White) Chitwood and Paratrichodorus minor (Colbran) Siddiqui that included 1,3-dichloropropene fumigated and nonfumigated subplots. ‘Jewel’, followed by ‘Pope’, was the highest-yielding copper-skinned type and the least affected by nematode infection; however, it supported large numbers of M. incognita. Yields of ‘Eureka’ were lowest in nonfumigated plots in the presence of P. minor. Significantly greater P. minor population increase occurred on ‘Eureka’ than on other clones. Yield of red-skinned W-152 was greater than ‘Garnet’ on fumigated plots, but W-152 showed no greater yield when nematode-infected. ‘Oklamex’, L5-19, and NC-719 were discontinued after 1 year because of poor yield or quality. M. incognita resistance in all clones prevented damage to the appearance of sweet potatoes, but plant growth and yield were increased significantly in fumigated plots compared with yields from nonfumigated plots. M. incognita reproduced on all lines, especially when soil temperature was high in 1981.
For about 30 years, the Univ. of California has used advanced laboratory techniques in addition to traditional methods to produce pathogen-free and true-to-type sweetpotato seedstock. The effort continues with the varieties important in the marketplace today. This program serves as a model for the use of meristem culture by foundation sweetpotato programs in other states.
‘Eureka’, a soil rot-resistant, high-quality sweet potato (Ipomoea batatas L.) formerly tested under the designation of L4-131, was developed by the Louisiana State University Agricultural Experiment Station and is jointly released by Louisiana State University Agricultural Experiment Station and the University of California Agricultural Experiment Station.