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A breeding program to develop improved sweetpotato genotypes with increased sweetpotato weevil resistance was started in 1990. Germplasm, including plant introductions, cultivars, and breeding lines with reported insect resistance, was field tested for injury levels by applying low numbers of weevils. Low levels of resistance were found and `Regal' was among the highest. Top performing lines were selected and intermated. After 2 selection cycles the most highly resistant selection produced 89% uninjured roots compared to 28% in `Regal'. Severity of injury score was 16 times lower in the most resistant selection (0.15) compared to `Regal' (2.40).

Progress in Breeding for Sweetpotato Weevil Resistance