Abstract
Reproduction of Pratylenchus coffeae on 25 sweet potato cultivars was examined in greenhouse and field plot tests. In the greenhouse test P. coffeae reproduced on 21 cultivars with Pf/Pi values of 1.2-26.9. In the field plot test all cultivars had final population densities higher than the initial densities. The P. coffeae reproduction rate on each cultivar had little correspondence with the level of resistance determined in a breeding procedure based on storage root damage. Of all cultivars tested, Elegant Summer showed the lowest reproduction rate in both tests.
