Sweetpotato weevil resistance breeding in Mississippi
1995
Thompson, P.G. | Schneider, J.C. | Graves, B.
Weevil resistance sources have been confirmed and new ones identified in field evaluations with low numbers of applied weevil. Twenty accessions form the U.S. Plant Introduction Station produced higher percentage of uninjured roots with yields at least equal to those of Regal, to resistant control. Two lines selected from the breeding population produced 16 and 18 more uninjured roots than Regal. Compararisons of resistance levels of plant materials developed in breeding programs at the U.S. Vegetable Lab and at the International Institute of Tropical Agriculture (IITA) and their progenies show that resistance levels are similar. Intermatings of different sources of resistance have been completed and selections for increased levels are being made. Increased heritability and selection response are expected from progenies of combined resistance sources. Predicted selection gain based on heritability estimates was higher with selection for uninjured root number than percentage of uninjured roots.
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