Abstract
Two inoculation methods were developed and compared to evaluate cured sweetpotato (Ipomoea batatas) storage roots for resistance to Rhizopus soft rot caused by Rhizopus stolonifer and R. arrhizus. Roots that had been cured and stored for at least 3 wk were first washed in a commercial washer. In the impact/dip method, roots were wounded by allowing them to drop approximately 1 m from the end of the washer into crates, after which they were dipped in a suspension of sporangiospores. In the puncture inoculation method, deep-threaded wood screws were dipped in a spore suspension and then hammered about 5-10 mm deep into the median of the root. Most genotypes were more susceptible to R. stolonifer than to R. arrhizus; thus, subsequent evaluations were made using only R. stolonifer
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