Abstract
Root-knot nematodes, genus Meloidogyne, are the most damaging nematodes of sweetpotato causing yield reduction and aesthetic damage of the marketable product. Several sweetpotato cultivars currently grown in the United States have intermediate to high resistance to Meloidogyne incognita, however, many of these cultivars are susceptible to M. enterolobii. Therefore, the response of 69 sweetpotato genotypes to M. enterolobii and M. incognita was evaluated under greenhouse conditions to identify potential sources of resistance. The cultivars ‘Beauregard’ and ‘Jewel’ were used as controls. Results showed that sweetpotato genotypes were either highly resistant or highly susceptible to M. enterolobii, while they showed a wide spectrum response to M. incognita ranging from highly susceptible to highly resistant. Twenty-six genotypes were resistant to M. enterolobii and eleven genotypes were resistant to M. incognita. Combined resistance to M. enterolobii and M. incognita was observed in three sweetpotato genotypes. Selected genotypes from this study will be used to incorporate the observed resistance into a commercially viable sweetpotato cultivar.
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